Photoshop - Export As - Why no Progressive JPG Option
Why does the latest version of Photoshop not have the JPG Progressive option as a choice when using the Export As option and only in the Legacy Save for Web?
Export As offers higher quality compression, so it a bit disappointing that you don't get to use it if you are optimising your images for websites with Progressive.
Google PageSpeed - Insights - Optimize Images
JPEG is a lossy format. The compression process removes visual details of the image, but the compression ratio can be 10x larger than GIF or PNG.
- Reduce quality to 85 if it was higher. With quality larger than 85, the image becomes larger quickly, while the visual improvement is little.
- Reduce Chroma sampling to 4:2:0, because human visual system is less sensitive to colors as compared to luminance.
- Use progressive format for images over 10k bytes. Progressive JPEG usually has higher compression ratio than baseline JPEG for large image, and has the benefits of progressively rendering.
- Use grayscale color space if the image is black and white.
Save for Web