Pictures in BMP format are lossless and have the best quality and clearest quality; however, large files are slow to transfer and are not suitable for network applications. Others are compressed, and there will be a certain degree of pixel loss after saving, but the files are small and can be transferred quickly, making them suitable for applications on the Internet.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
Pictures in BMP format are saved losslessly and have the best quality.
JPEG: It is lossy compression, and the file extension is ".jpg" or ".jpeg".
GIF: is a standard format for compressing images with monotone colors and clear details, such as line drawings, logos, or illustrations with text.
PNG: PNG uses a lossless data compression algorithm derived from LZ77, which is generally used in JAVA programs, web pages or S60 programs because of its high compression ratio and small generated file size.
BMP: It is an image file format that has nothing to do with hardware devices. It is widely used. It does not use any other compression except for the optional image depth, so the image quality is the best.
Extended information:
A typical BMP image file consists of four parts:
1: Bitmap Header file data structure, which contains BMP image file type, display content and other information;
2: Bitmap information data structure, which contains BMP image width, height, compression method, and definition Color and other information;
3: Palette, this part is optional. Some bitmaps require a palette, and some bitmaps, such as true color images (24-bit BMP), do not require color correction. Board;
4: Bitmap data. The content of this part varies according to the number of bits used in the BMP bitmap. In 24-bit images, RGB is used directly, while others smaller than 24-bit use palettes. Medium color index value.
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