reduce image file size

Understanding of argb_8888, Alpha_8, argb_4444, rgb_565A: TransparencyR: RedG: GreenB: BlueBitmap.config argb_4444: Four bits per pixel, which is a=4,r=4,g=4,b=4, then one pixel takes up 4+4+4+4=16 bit.Bitmap.config argb_8888: Four bits per pixel, which is a=8,r=8,g=8,b=8, then one pixel takes up 8+8+8+8=32 bit.Bitmap.config rgb_565: Four bits per pixel, i.e. r=5,g=6,b=5, no transparency, then one pixel occupies 5+6+5=16 bitBitmap.config Alpha_8: Four bits per pixel, only transparency, no color.

= localfilepath.substring (0, Localfilepath.lastind Exof (".")); Gets the file path, with file name, with no suffix//string fn = sf. FileName; Image img = new Bitmap (this.pictureBox1.Image, 60, 60);//Save as Picture size limit img.

= Imagecreatefromjpeg ($filename);/* How much to cut, length/width */$new _img_width = 120;$new _img_height = 42;/* Create a new blank file first */$newim = Imagecreate ($new _img_width, $new _img_height);Where will the output map begin? x, Y, which side of the original map to start with X, Y, how much x, y (resize) to draw, how big X to catch, yImagecopyresampled ($newim, $im, 0, 0, 7, 174, $new, _img_width, $new _img_height);/* zoom into a figure o

During the development of iOS, we may sometimes use Uicolor * color= [Uicolor colorwithpatternimage:image];Sometimes the background image appears incomplete or the background image is displayed as multiple images instead of a whole picture.At this point we need to enlarge or reduce the size of the

button (Khan! It was marked, but it was blocked by Baidu's watermark ~~~), Create a new action. 5 , Enter the name of the new action "zoom in + watermark ". Click record. Action start record, the button turns red. 6 Next, modify the image size, color, and so on (according to your needs ). In the title bar> images, you can find them. 7 Add a watermark. Find the horizontal text tool. You can modify t

= 'book_rabbit_rule.jpg ';/* Read the image file */$ Im = imagecreatefromjpeg ($ filename );/* How much image is to be cut, length/width */$ New_img_width = 120;$ New_img_height = 42;/* Create a new blank image first */$ Newim = imagecreate ($ new_img_width, $ new_img_height );// The output graph starts from x and y.

){Case 0x00:Case 0x01:Case 0xD0:Case 0xD1:Case 0xD2:Case 0xD3:Case 0xD4:Case 0xD5:Case 0xD6:Case 0xD7:Break;Case 0xc0: // SOF0 segment (basic image information)Case 0xc2: // SOF0 segment in JFIF format{// Locate the SOFO segment and parse the width and height InformationGetJpgSize (stream );Return;}Default: // skip all other segments// Get the segment length and skip it directlyPs = stream. ReadByte () * 256;Ps = stream. Position + ps + stream. ReadBy

This article mainly introduces how to adjust the image size of php on the server. The example analyzes the related skills of imageResizer and loadimage Image operations, for more information about how to adjust the image size on the server, see the example in this article. S

CSS automatic control of image size codeA lot of friends will find this site of the article in the picture if the picture is relatively large you will find that the picture is automatically hidden and there is a part of the invisible, then we will introduce you to the use of CSS automatic control image size bar, there

Modifying the border attribute of the image size alignment interval is common and practical during the development process. This article will introduce you in detail. Image tagging: To insert an image into the page, we need to use the "img" tag. Its attribute is "src" Example code: Conclusion: Here we assume that t

When uploading images, if you do not limit the size of the uploaded images, the consequences are very serious. There are two ways to solve this problem: background processing and foreground processing. Requirement Analysis: When uploading images, if you do not limit the size of the uploaded images, the consequences are very serious. So how can we solve a difficult problem? There are two methods:1) backgrou

When uploading images, if you do not limit the size of the uploaded images, the consequences are very serious. There are two ways to solve this problem: background processing and foreground processing. Requirement Analysis: When uploading images, if you do not limit the size of the uploaded images, the consequences are very serious. So how can we solve a difficult problem? There are two methods:1) backgrou

Today, my colleague asked me about the image compression algorithm. I think of a project I did about two or three years ago. It contains two compression algorithms: size and quality, and supports JPEG, bmp, and PNG formats. I will post this logic for your reference today. (For details, refer to the CSDN blog from breaksoftware) Size Compression Bool CompressImage