Hello, dear!
Good day to you!
In this post, I will introduce the picture format --- GIF.
Graphics Interchange Format (GIF) is an image file format developed by CompuServe in 1987. GIF file data is a lossless compression format of continuous tone based on LZW algorithm. Its compression rate is generally about 50%, it does not belong to any application. Almost all related software supports it, and there are a large number of software in the public domain using GIF image files.
The data of GIF image file is compressed, and variable length equal compression algorithm is adopted. So the image depth of GIF ranges from Lbit to 8bit, that is to say, GIF supports 256 kinds of color images at most. Another feature of GIF format is that it can store many color images in a GIF file. If the image data stored in a file are read out one by one and displayed on the screen, it can form the simplest animation.
GIF decoding is faster because GIF images stored in interlaced lines can be scanned four times when displayed while decoding. Although the first scan only shows one eighth of the whole image, and the second scan only shows one fourth of the whole image, it has already shown the outline of the whole image. When displaying GIF images, the interlaced images will give you the impression that they appear to display faster than other images, which is the advantage of interlaced storage; in addition, GIF does not support Alpha transparent channels.
Best wishes!
