Why do high-definition videos on the Internet become blurred when pushed by the official WeChat account?

1. All the pictures uploaded to the official WeChat account are basically compressed, but the severity of compression in different formats is different.

Compression degree:? JPG & gt； ? GIF？ & gt？ PNG24 bits.

2. The adjusted picture format, but the quality of the picture displayed after uploading is slightly different, which is related to the color tone of the picture and whether the picture is a photographic/non-photographic picture.

A. Let's start with the design. Generally speaking, bright colors, such as rose red, bright orange and bright blue, are easy to blur when they appear in a large area on the design drawings. At this time, the effect of saving as png24 bits is better than GIF in most cases.

B If it is a diagram with many design elements, it may be better to save it in GIF format in scheme 1.

C. For photographic maps, the best choice is to save them in PNG format. The uploaded pictures are basically free from blur and distortion.

Extended data

Adjust the major premise:

The size and width of the picture you upload cannot be less than 600px. (height is not limited).

Because the width of the picture is much smaller than the screen width of the mobile phone, then the picture itself is too small, and when it is saved, it will- Once compressed, it is even more blurred. Therefore, it is recommended to adjust the width of the picture to 600px before saving, which can ensure that the picture can be clear even if it is saved as png or gif and compressed.

Do not save in JPG format. JPG format will be compressed the most when uploaded, and the image blur is the highest.

Degree of compression:

JPG/IPEG is a lossy compression format, which can compress pictures in a small storage space. Duplicate or unimportant data in the pictures will be lost, so it is easy to damage the picture data, which is why we feel that the uploaded pictures are blurred.

PNG, formerly known as "Portable Network Image", belongs to lossless compression format and provides various technical support such as 24-bit and 48-bit true color image support.

GIF is a continuous tone lossless compression format based on LZWE algorithm, which supports images with up to 256 colors.

Therefore, images in PNG and GIF formats can basically keep the image clarity unchanged, which is related to their "lossless compression" properties.