Specifications/inches/cm
The data table (in inches) of the maximum number of photos that can be rinsed by a digital camera calculated based on 150ppi)
5 million pixels valid 4915200, pixels 2560x1920. Portable Photo size: 17X13, 21-inch diagonal line
4 million pixels valid 3871488, pixels 2272x1704. Washable Photo size: 15x11, 19-inch diagonal line
3 million pixels valid 3145728, pixels 2048x1536. Portable Photo size: 14x10, with a diagonal line of 17 inches
2 million pixels valid 1920000, pixels 1600x1200. Washable Photo size: 11x8, 13-inch diagonal line
1.3 million pixels valid 1228800, pixels 1280x960. Washable Photo size 9x6, 11-inch diagonal line
0.8 million pixels valid 786432, pixels 1024x768. Washable Photo size 7x5, 9-inch diagonal line
0.5 million pixels valid 480000, pixels 800x600. Washable Photo size 5x4, diagonal 7 inch
0.3 million pixels valid 307200, pixels 640x480. Portable Photo size: 4x3; diagonal line: 5 inches
As shown in the table above:
5-inch photo (3x5) with X resolution
6-inch photo (4x6) with X resolution
7-inch photo (5x7) with X resolution
8-inch photo (6x9) with 1280x960 resolution
Green: Good Yellow: good earth yellow: normal
Photo size: Table 2
1x1.5 inch: 2.5x3.5 (CM); 2.2X3.2 (CM); 3.3x4.8 (cm)
1.5x2 inch: two-inch 3.5x4.9 (CM); two-inch 3.5x4.5 (CM); two-inch 3.5x5.3 (cm)
1-inch 1R 2.6x3.7 (cm)
2-inch 2R 6.3x8.9 (cm)
5x3.5 (5 inch 3R) 12.70x8.89 (cm)
6 × 4 (6 inch 4R) 15.24 × 10.16 (cm)
7x5 (7 inch 5R) 17.78x12.70 (cm)
8 × 6 (8 inch 6R) 20.32 × 15.24 (cm)
10 × 8 (10 inch 8r) 25.40 × 20.32 (cm)
12 × 10 (12 inch) 30.48 × 25.40 (cm)
14 × 12 (14 inch) 35.56 × 30.48 (cm)
16 × 12 (16 inch) 40.64 × 30.48 (cm)
18 × 12 (18 inch) 45.72 × 30.48 (cm)
18 × 14 (18 inch) 45.72 × 35.56 (cm)
20 × 16 (20 inch) 50.80 × 40.64 (cm)
20 × 18 (20 inch) 50.80 × 45.72 (cm)
24 × 20 (24 inch) 60.96 × 50.80 (cm)
30 × 24 (30 inch) 76.20 × 60.96 (cm)
32 × 24 (32 inch) 81.28 × 60.96 (cm)
36 × 24 (36 inch) 91.44 × 60.96 (cm)
40x32 (40 inch) 101.6x81.28 (cm)
42 × 32 (42 inch) 106.6 × 81.28 (cm)
48 × 32 (48 Inch) 121.9 × 81.28 (cm)
(Note: for example, passports and visa applications, the level-1 certificate usually uses a large size, 48mm × 33mm. The ID card and Health Check table mostly use a small inch of 32mm x 22mm, the second generation of identity
Certificate
(26mm × 32mm), while a common inch is 25mm × 35mm. Standard Photo size for passport travel documents: 48mm × 33mm, 21mm mm to mm ~ 24mm, head minister
Degrees: 28mm ~ 33mm .)
Document sizes: Table 3
1. ID card (22mm × 32mm) Second Generation ID card (26mm × 32mm)
2. Driver's license (22mm × 32mm)
3. Black and white small inch (22mm × 32mm)
4. Small color inch (27mm × 38mm)
5. Large-inch color (40mm × 55mm)
6. General certificate Photo (33mm × 48mm)
7.1 inch (25mm × 35mm)
8.2 inch (35mm × 49mm)
9.3 inch (35mm × 52mm)
10. Hong Kong and Macao pass (33mm × 48mm)
11. U.S. Visa (50mm × 50mm)
12. Japanese Visa (45mm × 45mm)
13. Large two-inch (35mm × 45mm)
14. Passport (33mm × 48mm)
15. graduation photos (33mm × 48mm)
16. Driver's license (21mm × 26mm)
17. Car photos (60mm × 91mm)
The photo "Inch" refers to "Inch", 1 inch = 2.54 cm 5 inch = 12.7 cm
In addition, the size of the photo is different from that in China and abroad, for example, 3.5x5 4x6 5x7 ....
The domestic name is 5-inch, 6-inch, and 7-inch.... The value is the long side of the photo;
In foreign countries, the value of 3R, 4R, 5R... is the shorter side of the photo.
Electronic photo collection standards
1. The electronic information of the photo is a color image, which is stored as a one-person image file. The image file is named by the ID card number (the secret officer ID number is used for military personnel) in the format "****. jpg "." ***** "indicates the ID card number (18 or 15 digits) or secret certificate number, and" jpg "indicates the image file format.
Ii. Background requirements: uniform blue, output blue color (RGB or gmyk): R51 g143 b178, C80 M13 Y20 K3
3. lighting requirements: Configure three-color soft lamps (cold light source and 5600 K color temperature), two lamps, 12 matching lamps, and supporting cables (6 meters × 2) and 2 sets of plug. The height of the luminaire set is the same as that of the subject's shoulder. The angle is about 45 degrees, and the face is aligned with the person's head. The distance is 1.5-2 meters.
Iv. Requirements for digital cameras: The maximum resolution (DPI): 2048, Standard Storage Capacity (MB): 16 MB, and optical zoom ratio: 4. Aperture F8; shutter 125/Second, the upper part of the top of the imaging area is required to be empty 1/10, the head is 7/10, and the shoulder is 1/5; left and right are empty 1/10.
Pixel and resolution of digital photo Printing
Frequently asked by customers:
* The maximum pixel of my camera is 2048x1536. I have read that many online stores recommend 7 inches. However, in PS, the default resolution of PP 70 is clear.
It is very large. It should be 12-inch or above. Why should I change the resolution to 300 during output? Does the output of 70 resolution produce particles or mosaics? But why is it not displayed on the computer? So
According to the printing requirements, I changed the resolution of PP to 300. At this time, I could only rush to the 7-inch version ~ However, I still think the pixel size is clear ~ You don't even know what to say, so strange!
First, the display imaging is digital, that is, composed of a number of points. If you adjust the display to 800*600, It is 800 points long and 600 points wide, 1024*768 is a truth.
Take 800*600 as an example. If your photo is 2048*1536, it is still clear to enlarge it to about 250%. If you put it above 300%, it will be rough.
Reading a photo on the monitor is actually irrelevant to the resolution. It is only related to the number of pictures you have taken.
If we want to convert a 800*600 photo (scaled up to a full screen on a 800*600 display) to 1600*1200 through photoshop or other tools
This is called interpolation. After the conversion, it is clear to zoom in to the full screen on the 800*600 display, but it does not appear when the screen is full on a 1024*768 or 1600*1200 display.
Clearly, that is to say, this interpolation has no major effect.
Let's talk about the photo. Whether it's using a printer or our laser printing, the principle is different from watching the photo on the monitor. At this time, it has a lot to do with the resolution.
Why does the photo printed by the printer have a good effect without laser printing? In addition to laser printing, the most important reason is that the resolution of the laser printing is high.
The resolution of laser printing is 300 lines, that is to say, 1 inch (2.54) points, and the best printer is only 300-lines.
2048*1536 recommended 7-inch means 2048/300 = 6.83-inch, nearly 7-inch. Of course, an 8-inch scale is acceptable, but the effect is slightly different. 2048/8 = 256,
That is, the resolution is 256 when the scale-out is 8-inch, and the best effect (resolution 300) of the scale-out is not realized.
If you have a good printer with a resolution of 1440*1440, it is about 140 lines. Your photo is 2048*1536, then 2048/140 = 14.6
In other words, printing with a printer can produce 14-15 inches, or use a printer to produce a 5-inch, 7-inch, 10-inch, or 14-inch definition. However, compared with the 7-inch ratio of the printer
The obvious difference is that this is the advantage of high resolution of the printer.
Display resolution
The display resolution is the resolution of the display when the image is displayed. The resolution is measured by points. The "point" on the display is pixel ). The value of the display resolution refers to all visualization values of the entire display.
The number of horizontal and vertical pixels in the area. For example, the resolution of 800 × 600 indicates that 800 pixels are displayed horizontally and 600 pixels are displayed vertically throughout the screen. Displays the horizontal pixels and troughs of resolution.
The total number of straight pixels is always a certain proportion, usually, or. Each monitor has its own highest resolution and can be compatible with other lower display resolutions, so a monitor can
Display with multiple different resolutions. The higher the Resolution, the better. However, one factor to consider is whether the human eyes can recognize the resolution. For example, on a 14 inch display with a maximum resolution of 1024x768
800 × 600 is the highest resolution that the human eye can recognize (we call it the best resolution for the time being). Although the display can accurately display images at a resolution of 1024 × 768, the human eye is no longer accurate.
The screen information is identified. On a screen of the same size, the higher the Resolution, the smaller the display. The display size is large and small, and the display resolution indicates the number of pixels in all visible ranges.
The display rate is different for different monitors. For example, for a 800x600 resolution, a 14 inch display has a higher display accuracy than a 17 inch display with the same resolution. Some
For better quality displays (such as Philips 15a and 14a), 14 inch displays can reach 1280 × 1024, and 15 inch monitors can reach 1600 × 1200.
Update Rate
The refresh rate is the speed at which the screen is refreshed. The unit is Hz [HZ]. The lower the refresh frequency, the faster the image flashes and shakes, and the faster the eyes become tired. The higher the refresh frequency, the more natural the image is displayed.
Naturally clear, in general, if the refresh frequency can reach more than 80Hz, it can completely eliminate image flickering and shaking, and the eyes will not be too tired, this is the most basic requirement for display in the millennium.
Horizontal refresh rate, also known as horizontai scanning trequency, is the number of times a horizontal line is scanned in seconds on the display, measured in kHz.
Vertical Scanning Frequency, also known as the vertical fl rate, is measured in MHz and determined by the horizontal fl rate and screen resolution, the vertical refresh rate indicates the number of times the screen image is repainted per second, that is, the number of screen refreshes per second. Generally, the vertical refresh rate should not be lower than 85Hz.
For DPI:
To understand the meaning of DPI, the dot per inch is the point displayed on 1 inch, and this point is not a pixel in the sense.
In general, the display is 96 DPI, that is, 96 pixels equals 1 inch, but this is not the case because the display resolution can be adjusted.
For the display settings you mentioned above, 96 DPI can be understood as representing 1 inch in 96 pixels. When it becomes 120dpi, 120 pixels are used to represent 1 inch, while the system object (font, the image is represented by the number of inches. Therefore, the image and font size become larger at 120dpi.
For more information about DPI, see appendix 2.
Appendix:
1. Resolution Data
Resolution
Resolution-a measure of the image resolution or concentration. For example, the resolution represents the number of dots per inch (DPI) displayed vertically and horizontally. Bitware can send and receive fax documents with standard or standard (100 × 200 dpi) and fine resolution (200 × 200 dpi.
Resolution is a concept that indicates the precision of a plane image. It is usually measured by the number of horizontal and vertical points, expressed in the form of horizontal points × vertical points. In a fixed plane, the higher the resolution
The more points you can use, the more detailed the image. There are a variety of resolutions, there is a display resolution indicating the display accuracy on the monitor, there is a printing resolution indicating the printing accuracy on the printer, there is a scanning representation on the scanner
Precise scan resolution. For example:
Display resolution
The display resolution is the resolution of the display when the image is displayed. The resolution is measured by points. The "point" on the display is pixel ). The value of the display resolution refers to all visualization values of the entire display.
The number of horizontal and vertical pixels in the area. For example, the resolution of 800 × 600 indicates that 800 pixels are displayed horizontally and 600 pixels are displayed vertically throughout the screen. Displays the horizontal pixels and troughs of resolution.
The total number of straight pixels is always a certain proportion, usually, or. Each monitor has its own highest resolution and can be compatible with other lower display resolutions, so a monitor can
Display with multiple different resolutions. The higher the Resolution, the better. However, one factor to consider is whether the human eyes can recognize the resolution. For example, on a 14 inch display with a maximum resolution of 1024x768
800 × 600 is the highest resolution that the human eye can recognize (we call it the best resolution for the time being). Although the display can accurately display images at a resolution of 1024 × 768, the human eye is no longer accurate.
The screen information is identified. On a screen of the same size, the higher the Resolution, the smaller the display. The display size is large and small, and the display resolution indicates the number of pixels in all visible ranges.
The display rate is different for different monitors. For example, for a 800x600 resolution, a 14 inch display has a higher display accuracy than a 17 inch display with the same resolution. Some
For better quality displays (such as Philips 15a and 14a), 14 inch displays can reach 1280 × 1024, and 15 inch monitors can reach 1600 × 1200.
Print resolution
The print resolution is directly related to the quality of the output image or text of the printer. Here we only consider the print resolution of inkjet printers and laser printers. Print resolution with DPI (DOT per
Inch) to indicate the number of points printed per inch. The horizontal and vertical resolutions of inkjet and laser printing are usually the same. For example, when the printing resolution is 600dpi, the printer is on one
600 vertices are printed vertically in the inch area, 600 vertices are printed horizontally, and a total of 360000 vertices can be typed. However, the DPI inkjet printer is not necessarily more efficient than the 600dpi laser printer.
Better print quality. This is because each ink point printed by the inkjet printer is only approximately the same, and each ink point will spread around before drying, without the laser printer producing points as even.
Scan resolution
There are three main factors that determine the scanner performance: scan resolution, maximum scan page, and color digits. Scan resolution is an input resolution, and both the display resolution and print resolution are output resolutions. We are making
When scanning images with a scanner, you can adjust the scanning precision as needed. Unlike the display resolution and print resolution, the scanning resolution is fixed or only available. The scan resolution is also represented by DPI, but it is not as flat as the printer
The direct resolution is consistent with the horizontal resolution, and the horizontal resolution of the scanner is half of the vertical resolution.
Scanning resolution can be divided into two types: Optical Resolution and interpolation resolution. The optical resolution is the number of actual points that the scanner reads from the source image during scanning. Generally, the optical resolution of a scanner ranges from 300 x DPI
1000 × 2000 DPI. In addition, some scanners have a resolution of 1200 × 1200 dpi. These scanners use hardware functions to improve the accuracy of horizontal resolution. Interpolation resolution refers
The resolution formed after inserting some points on the basis of the scan point. It is the maximum resolution that can be adjusted during image scanning, usually 4-16 times of the optical resolution, 4 times, 8 times, 16 times the most common. For example, optical
The interpolation resolution of a scanner with a resolution of 300 × 4800 DPI can reach 9600 × DPI. When purchasing a scanner, you should consider the optical resolution instead of the interpolation resolution. After all, the interpolation resolution is generated.
The vertices instead of the actual scan points. Although the resolution is improved to make the image more detailed, the details are slightly different from the original image. It does not represent the authenticity of the scan. However, although the optical resolution is small,
But it represents the real precision of the scan. The interpolation resolution is 4800dpi. The optical resolution may be 300 × 600 dpi, or 600 × 1200 dpi.
Make sure you understand the size of the optical resolution. For images with low scanning requirements, use the precision of DPI. For images with high precision requirements, use a precision greater than DPI.
The resolution of LCD and conventional CRT displays is one of the important parameters. The resolution supported by conventional CRT display is elastic, while the pixel spacing of LCD is fixed. Therefore, the display mode is not as large as that supported by CRT. The optimal resolution of the LCD, also called the maximum resolution, enables the LCD display to display the optimal image.
At present, the optimal resolution of 15 inch LCD is 1024x768, 17 ~ The optimal resolution of 19 inch is usually 1280x1024, and a larger size has a larger optimal resolution.
Two display modes are available when the LCD display has a low resolution. The first is center display. For example, svga is displayed on the XGA 1024 × 768 screen.
Only 800x600 pixels in the center of the screen are displayed. Other pixels that are not displayed remain dark. Currently, this method is rarely used. The other is extended display.
Display: When the display is lower than the best resolution, each pixel is expanded to the display of adjacent pixels through the differential algorithm, so that the entire screen is filled. This will also cause the image to lose its original definition and true color.
Since the maximum resolution of an LCD of the same size is usually the same, the price of an LCD of the same size is basically irrelevant to the resolution.
2. DPI data
DPI
DPI is the unit of recording on printing, which means that the dot per
Inch ). However, with the rapid development of digital input and output devices, most people use DPI to describe the resolution of digital images, but more rigorous people may note that the dot and
The display pixels of computer monitors are not the same. Therefore, more professional people will use pixel per inch to indicate the resolution of digital images to distinguish them.
We usually talk about how much DPI the printer resolution is, which refers to "the maximum" theoretical "ink points" that can be printed per inch in the highest resolution mode of the printer ".
Therefore, a more reasonable explanation of DPI is as follows:
If the resolution of a printer is 4800 × 1200 dpi, it means that in the X direction (horizontal), the closest distance between the two ink points can reach 1/4800 inch; in the Y direction (vertical, the distance between the two ink points can reach 1/1200 inch.
In addition, we usually think that the printing accuracy (for example, 4800x1200 dpi) of images larger than 600x600dpi is meaningless on ordinary paper.
For example, the maximum nominal resolution of an HP Inkjet Printer is 4800 × 1200 dpi, which means that 1 inch ink points can be theoretically placed at every 4800 bytes in X direction (horizontal) of the paper. However
What happens if all 1 inch ink points are placed on 4800 of the normal media? -- The absorption of ink by paper is saturated, and the ink is connected into a piece, which reduces the resolution.
Therefore, the number of "theoretical" points refers to the maximum capacity that the printer can achieve, but the implementation depends on the combination of paper, if the use of dedicated paper, can achieve better performance, place more independence on each inch
Ink point. If the selected maximum resolution is not supported by the paper, the adjacent ink points may be merged into one piece to print the image.
Therefore, you may find that, in the new HP Deskjet printer (such as HP deskjet5550), if you do not select dedicated paper, in order to ensure the print effect, the printer does not print at the highest resolution.
Resolution (resalution) is the precision of the screen image, which refers to the number of points that the display can display. Because the dots, wires, and surfaces on the screen are composed of dots, the display points
The larger the number, the finer the screen, and the more information can be displayed in the same area. Therefore, resolution is one of the most important performance indicators. You can think of the entire image as a large board with a resolution
It indicates the number of intersections of all longitude and weft.
DPI (points per inch)
For a screen with a resolution of 1024x768, that is, each horizontal line contains 1024 pixels, with a total of 768 lines. That is, the number of scanned columns is 1024, and the number of rows is 768. Resolution not only
It is related to the display size, and is also affected by such factors as the time range of the picture tube and video bandwidth. Among them, it is closely related to the refresh frequency, strictly speaking, only when the refresh frequency is "no blinking refresh frequency", the display can achieve
To the maximum resolution, the maximum resolution of the display can be called.
The refresh rate is divided into vertical refresh rate and horizontal refresh rate. Vertical refresh rate indicates the number of times the screen image is repainted per second, that is, the number of times the screen is refreshed per second, in Hz. The flushing rate we generally mention usually refers to the vertical flushing rate. In general, if the update rate is above Hz, the human eye will not feel blinking, which is good for ensuring eye health.
Common photo sizes
Currently, the digital printing system can provide 10 printing services of different specifications, ranging from 1 inch to 16 inch. Different sizes have different requirements for digital photos. 1 inch 2.5*3.5 413*295 7-inch 7x5 17.8*12.7 1680x1200 + 2 million pixels
1. ID card (22mm * 32mm) The size of the photo is in inches. 1 inch = 2.54 cm 9*6 is 22.54 cm * 15' 24cm. You just need to refresh it yourself. If it is a negative film, it is not in this size, only the master can zoom in to 10 inch and then crop |
Photo size
1x1.5 (1 inch) 2.6*3.9 inch 2.5*3.5
1.5x2 (2-inch) 3.8*5.1 large two-inch 3.5*5.0 small two 3.5*4.5
5*3.5 (5-inch/3R) 12.70*8.89
6*4 (6-inch/4R) 15.24*10.16
7*5 (7 inch/5R) 17.78*12.70
8*6 (8-inch/6R) 20.32*15.24
10*8 (10 inch/8r) 25.40*20.32
10*12 (12-inch) 25.40*30.48
12*14 (14-inch) 30.48*35.56
12*16 (16-inch) 30.48*40.64
14*18 (18-inch) 35.56*45.72
16*20 (20 inch) 40.64*50.80
20*24 (24-inch) 50.80*60.96
24*30 (30 inch) 60.96*76.20
24*36 (36-inch) 60.96*91.44
Digital Camera printable Photo size table
To achieve satisfactory digital printing:
Photo specifications (INCHES) (centimeters) (pixels) Digital Camera type
1 inch 2.5*3.5 413*295
ID card photo 3.3*2.2 390*260
2-inch 3.5*5.3 626*413
Business cards
Horizontal layout: 90*55mm <square angle> 85*54mm <rounded corner>
Vertical layout: 50*90mm <square angle> 54*85mm <rounded corner>
Square version: 90*90mm 90*95mm
IC Card
85x54mm
3-fold Advertisement
Standard size: (A4) 210mm x 285mm
General brochure
Standard size: (A4) 210mm x 285mm
File cover
Standard size: 220mm x 305mm
Posters
Standard size: 540mm x 380mm
Flag
Standard size: 8 open 376mm x 265mm
4 open 540mm x 380mm
Handbag
Standard size: 400mm x 285mm x 80mm
Notebooks
Standard size: 185mm x 260mm 210mm x 285mm
Positive degree paper:
787 × 1092
Opening (positive) size unit (mm)
781x1086
2 open 530x760 3 open 362x781
4 open 390x543 6 open 362x390
8 open 271X390
16 Open 195x271
Note: finished product size = paper size-trimming size
Bulk paper:
850*1168
Opening (positive) size unit (mm)
844x1162
2 open 581x844 3 open 387x844
4 open 422x581 6 open 387x422
8 open 290x422
Note: finished product size = paper size-trimming size
Common enable size
(Unit: mm)
Size: 787x1092
Split: 736x520
4 open: 520x368
8 open: 368x260
16 open: 260x184
32 on: 184x130
Size (large): 850x1168
Split: 570x840
4 open: 420x570
8 open: 285x420
16 open: 210x285
32 on: 203x140
Positive degree paper:
787 × 1092
Opening (positive) size unit (mm)
781x1086
2 open 530x760
3 open 362x781
4 open 390x543
6 open 362x390
8 open 271X390
16 Open 195x271
Note: finished product size = paper size-trimming size
Bulk paper:
850*1168
Opening (positive) size unit (mm)
844x1162
2 open 581x844
3 open 387x844
4 open 422x581
6 open 387x422
8 open 290x422
Note: finished product size = paper size-trimming size
16
Large scale: 210x285
Degree: 185x260
8 open
Large scale: 285x420
Degree: 260x370
4-open
Large scale: 420x570
Degree: 370x540
2 open
Large scale: 570x840
Degree: 540x740
All-open
Large: 889x1194
Small: 787x1092
News and documents
Newspaper sizes: 547mm x 392mm and 545mm x 370mm
Common news paper has the following specifications:
Flat size: 787x1092mm, 850x ll 68mm, 880x l 230mm.
Reel size: width: 787mm, 1092mm, 1575mm; Length: about 6000 ~ 8000 meters.
General CD design size
1. Internal page: 123*126
2. bottom seal: 157*124
3. disc surface: outer ring _ 118, inner ring _ 36 or 25
To achieve satisfactory digital printing:
Photo specifications (INCHES) (centimeters) (pixels) Digital Camera type
1 inch 2.5*3.5 413*295
ID card photo 3.3*2.2 390*260
2-inch 3.5*5.3 626*413
Small 2-inch (passport) 4.8*3.3 cm 567*390
5-inch 5x3.5 12.7*8.9 pixel x840 + 1 million pixels
6-inch 6x4 15.2*10.2 1440x960 + 1.3 million pixels
7-inch 7x5 17.8*12.7 1680x1200 + 2 million pixels
8-inch 8x6 20.3*15.2 1920x1440 + 3 million pixels
10 inch 10x8 25.4*20.3 2400x1920 + 4 million pixels
12-inch 12x10 30.5*20.3 2500x2000 + 5 million pixels
15-inch 15x10 38.1*25.4 3000x2000 6 million pixels
In addition, the number of pixels for digital films is several million. They only look at the number of long-edges, 1200 out of 5.
1400 to 6, 1700 to 7, and so on...
1 inch (inch) = 2.54
The X-inch is the long side of the photo. For example, a 5-inch image is 2.54x5 = 12.7.
12-inch is 2.54x12 = 30.5,
8x12 means the long side is 2.54x12 = 30.5, the short side is 2.54x8 = 20.3
3R refers to paper, 3R is 89mm, 5R is 127mm
Generally, 3x5 means 5x5 R means 5x7 means 7.
R indicates the rectangular shape (rectangle in English), which is calculated by the shortest side.
Most of the photos taken on machines like 135 are washed into 3R, 4R, or 5R. If the photos are washed at the bottom of 6x7 on machines like 120, they will not be "3-inch x 5-Inch, it is a 3-inch x 3.5-inch photo, which is also a 3R photo. It must be 3-inch.
Another photo is taken at the bottom of 120 Hassu 6x6 because its negative film is a square shape. If you want to take a photo in a square shape, such as "3 inch x 3 inch ", "5-inch x 5-Inch", in this case we do not call 3R, but 3 s or 5 S, S represents square (square in English ).
The photos taken by a digital camera are generally 4-3 (the same as those taken on our monitor ), the proportion of the expanded photo is generally about 3: 2 (consistent with the length and width ratio of the film negative ).
Generally, the proportion of the photo to be printed must be cut to around, so that the photo to be printed will be filled with the whole photo sheet. If you do not want to crop your photo, or the content is too full,
There is no room for tailoring, so we have to leave some white edges on both sides during the printing expansion.
For example, if your photo is 1600*1200, the ratio is.
6-inch photos are 15.2*10.2, that is, the ratio is.
If your photo is not cropped, place a ratio on the photo paper.
Only a white edge can be left on both sides of the photo, just as a white box is added on both sides (not added up or down)
If you do not want to retain the white edge, you can cut the top or bottom of the photo,
Make the photo 1600*1074 (1600/15. 2*10.2 = 1074). This is,
The whole 6-inch photo sheet is filled.
The size of the 8-inch photo is 6*8 (15.2*20.3) and the size of the photo is 4: 3. Most digital photos do not need to be cropped.
To get a good photo, it is best for a digital camera to have a valid pixel of more than 3 million. At the same time, the resolution of the digital photo is also required. In general
Digital printing has a simple calculation method, which can calculate the resolution of the digital photos suitable for printing the size of the photo, the resolution is 1600 × 1200 digital photos, through 1600 × 250 =
The calculation method is 6 after 6.4 rounding, and the size of the printed photo is 6 inches. Then, you can multiply 6 by 250, it can be concluded that the resolution of 1600x1200 is more suitable.
1 inch 25mm × 35mm
2 inch 35mm × 49mm
3 inch 35mm × 52mm
Hong Kong and Macao pass 33mm × 48mm
US visa 50mm × 50mm
Japanese Visa 45mm × 45mm
Large 2-inch 35mm × 45mm
Passport 33mm × 48mm
Graduates Take 33mm × 48mm
ID card 22mm × 32mm
Driver's license: 21mm × 26mm
Car photos 60mm × 91mm
Maximum size of digital cameras and printable photos
5 million pixels valid 4915200, pixels 2560x1920. Portable Photo size 17X13, diagonal 21 inch
4 million pixels valid 3871488, pixels 2272x1704. Portable Photo size: 15x11, diagonal line: 19 inch
3 million pixels valid 3145728, pixels 2048x1536. Portable Photo size: 14x10, diagonal line: 17 inch
2 million pixels valid 1920000, pixels 1600x1200. Portable Photo size: 11x8, diagonal line: 13 inch
1.3 million pixels valid 1228800, pixels 1280x960. Washable Photo size 9x6, diagonal 11 inch
0.8 million pixels valid 786432, pixels 1024x768. Washable Photo size 7x5, diagonal 9 inch
0.5 million pixels valid 480000, pixels 800x600. Washable Photo size 5x4, diagonal 7 inch
0.3 million pixels valid 307200, pixels 640x480. Portable Photo size: 4x3, diagonal line: 5 inch
5-inch photo (3x5) with X resolution
6-inch photo (4x6) with X resolution
7-inch photo (5x7) with X resolution
8-inch photo (6x9) with 1280x960 resolution
Small 2-inch (passport) 4.8*3.3 cm 567*390
5-inch 5x3.5 12.7*8.9 pixel x840 + 1 million pixels
6-inch 6x4 15.2*10.2 1440x960 + 1.3 million pixels
7-inch 7x517.8*12.7 1680x1200 + 2 million pixels
8-inch 8x6 20.3*15.2 1920x1440 + 3 million pixels
10 inch 10x825.4*20.3 2400x1920 + 4 million pixels
12-inch 12x1030.5*20.3 2500x2000 + 5 million pixels
15-inch 15x1038.1*25.4 3000x2000 6 million pixels
In addition, the number of pixels for digital films is several million. They only look at the number of long-edges, 1200 out of 5.
1400 to 6, 1700 to 7, and so on...
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