Why is PNG format clearer than JPG format?

PNG pictures store a single raster image at any color depth. PNG is a platform-independent format.

Advantages: PNG supports advanced lossless compression. PNG supports alpha channel transparency. PNG supports gamma correction. PNG supports interleaving. The latest web browsers support PNG.

Disadvantages: Older browsers and programs may not support PNG files. As an Internet file format, PNG provides less compression than JPEG lossy compression. As an Internet file format, PNG does not support multi-image files or animation files. GIF format supports multi-image files and animation files.

JPEG: Joint Photographic Experts Group

JPEG pictures store a single raster image in 24-bit color. JPEG is a platform-independent format that supports the highest level of compression. However, this compression is lossy. Progressive JPEG files support interleaving. You can increase or decrease the compression level of JPEG files. However, the file size is at the expense of image quality. The compression ratio can be as high as 100: 1. (JPEG format can easily compress files at the ratio of 10: 1 to 20: 1, and the image quality will not decrease. ) JPEG compression can handle realistic photographic works well. However, JPEG compression can not provide ideal results for simple works with few colors, strong contrast, solid color borders or large solid color areas. Sometimes the compression ratio is as low as 5: 1, which seriously loses the integrity of the picture. The reason for this loss is that JPEG compression scheme can compress similar tones well, but JPEG compression scheme can not deal with strong differences in brightness or solid color areas well.

Advantages: Photographic works or realistic works support advanced compression. The file size can be controlled by variable compression ratio. Support interleaving (for progressive JPEG files). JPEG widely supports Internet standards.

Disadvantages: Lossy compression will reduce the quality of the original image data. When you edit and resave a JPEG file, JPEG will mix the quality of the original picture data. This decline is cumulative. JPEG is not suitable for simple pictures with few colors, similar colors in a large area or obvious brightness difference.