Size of a3.a4. a5.a6 paper

According to the national regulations, this size is adopted in the international standard series and has been set into the National Industrial Standard GB/t1999 for national implementation. The current size of the book is mainly a series, which has the following types: A4 (16 k) 297mm × 210mm; A5 (32 K) 210mm × 148mm; a6 (64 K) 144mm × 105mm; A3 (8 K) 420mm × 297mm; Note: A3

According to the national regulations, this size is adopted in the international standard series and has been set into the national industrial standard GB/T 1999 for national implementation. The current size of the book is mainly a series specification, which includes the following types:
A4 (16 k) 297mm × 210mm;
A5 (32 K) 210mm × 148mm;
A6 (64 K) 144mm × 105mm;
A3 (8 K) 420mm × 297mm;
Note: The size of A3 (8 K) is not yet determined, but it is generally used.

8 K paper refers to the A4 paper in our daily life. The size of the A4 paper (16 K paper) is 297mm × 210mm, and the size of the 32 K notebook (A5 notebook) the specification is 21 cm × 14.8 cm.

Introduction to paper size:
Size of A2 paper (4-open) 594mm × 420mm
A3 paper size (8-open) 420mm × 297mm
A4 paper size (large 16-open) 297mm × 210mm
B4 paper size (16 open)
B5 paper size (32-open)
8 Paper Size
According to the type of paper can be divided into news paper, embossed printing paper, coated paper, optical coated paper, matte paper, Dictionary paper, ground drawings, gravure printing paper, weekly paper, pictorial paper, whiteboard paper, copy paper, special paper and so on.

General paper can be divided into 60gsm, 80gsm, 100gsm, 105gsm, 120gsm, 157gsm, 200gsm, 250gsm, 300gsm, 350gsm, 400gsm by grams.
8-open is 8-open, and the size is 390x270mm. If there is no word in it, set it on your own.

Copyright sql163.com

Open all. Load 8 images. You need to pay attention to them.

The specification of the paper refers to the size of the paper after being trimmed and cut to a certain extent. In the past, how much "paper size" (for example, 8-open or 16-open) was used to indicate the size of paper. Now I use international standards, rules are as follows: A0, A1, A2, B1, B2 ...... to indicate the width of the paper. The ratio of the width (in X) and length (in Y) of the paper is X: y = 1: N.
According to the basic area of the paper width, the width is divided into Series A, Series B, and Series C. The width of the width is 841? 189mm, the width area is 1 m² mm; the size of B0 is 1000mm? 414mm, with an area of 2.5 m² mm; 917mm? 279mm, with an area of 2.25 m² square meters. The format of the paper only uses Series A and Series B. If the A0 paper is split into two equal points along the length, it becomes the A1 specification, and the A1 paper is split along the length direction to become the A2 specification, so it is split to the A8 specification; b8 paper is also split to the B8 specification according to this method. A0 ~ A8 and B0 ~ The size of B8 is listed in the following table. Among them, A3, A4, A5, A6, B4, B5, B6, and other seven kinds of format specifications are commonly used for copying paper.

For example, "A4" paper is to fold a-type basic paper four times. Therefore, the area of an A4 paper is one of the 4 power points of 2 of the basic area, that is, 1/16. The rest.

In the past, I never thought about the size of the image. I always thought it was difficult to convert pixels into common basic units such as millimeters and centimeters, and I also needed to consider the resolution size, the last time I made my resume cover with confidence, the figure worked very well, but it was ugly to print it out on A4 paper. Today I have studied this problem, but it is not difficult. The analysis is as follows:

Content from sql163.com

The size of A4 paper is 210mm * 297mm, that is, 21.0mm * 29.7 cm, while 1 inch = 2.54 cm. when the resolution is 72 pixels/inch, we convert it to pixel/centimeter, that is, 28.3. Now, when we convert it to the pixel when making the image (21*28.3) * (29.7*28.3), that is: 595*842 (in pixels );
In the same way, we can get:
When the resolution is 300 pixels/inch, the A4 size is 2479*3508 (in pixels)
When the resolution is 120 pixels/inch, the A4 size is 1487*2105. (Unit: pixels)
So if you want to print the image, it is best to convert it first, or it will probably reduce the image quality! In general, if it is a print, it is best to use 300 pixels/inch, if it is a printer or inkjet, you can choose 72 pixels/inch resolution.

A0 = 1189*841
A1 = 841*594
A2 = 594*420
A3 = 420*297
A4 specification: 210*297
Unit: millimeters

Size of photo sheet (mm)

A3 420X297

A4 210x297

A5 148x210

A6 144x105

5-inch 89x127

6-inch 102x152

127x178

Small A4 195X295