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For example, you can use to optimize your GIF and PNG images with the following command parameters inside brackets are optional : convert INPUT.

Reduce Chroma sampling to 4:2:0, because human visual system is less sensitive to colors as compared to luminance.

Always convert GIF to PNG unless the original is animated or tiny less than a few hundred bytes.

GIF and PNG are lossless formats, in that the compression process does not make any visual modification to the images.

For both GIF and PNG, remove alpha channel if all of the pixels are opaque.

Use grayscale color space if the image is black and white.

As a result, optimizing images can often yield some of the largest byte savings and performance improvements: the fewer bytes the browser has to download, the less competition there is for the client's bandwidth and the faster the browser can download and render content on the screen.

This rule triggers when PageSpeed Insights detects that the images on the page can be optimized to reduce their filesize without significantly impacting their visual quality.

The compression process removes visual details of the image, but the compression ratio can be 10x larger than GIF or PNG.

If you have a specific, answerable question about using PageSpeed Insights, ask the question in English on.

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