![]() ![]() Besides dropping the color profile and some other data, possibly including some copyright metadata you could have. Some tests should be done to these third-party compression tools, but most likely they are using a 4:2:2 subsampling or even smaller ones. The point is that according to my tests Ps uses the best quality one which is 4:4:4. And still, I got a decent result compressing at 10% compared to an uncompressed file. Those tests are done with ancient versions of Ps and PhotoPaint. Take your original, and paste it on top of the compressed version and choose difference as blending mode. What I want you to see is a way to actually analyze data loss. It is in Spanish, please use google translate for now. Let me spam you with an old test I did several years ago. I do not use "third-party" tools for optimizing file weight, I do not feel it is really necessary because you already have Ps. I must say that I was a little obsessed with the topic, but not that much anymore. That will slow down the optimisation process considerably, so you might have to compromise. Move the Optimisation level slider towards the Insane direction. Personally I keep JPEG quality to 97%, the quality drop is not noticeable (for my purposes).Įnable Strip PNG metadata and Strip JPEG metadata, that reduces file size and doesn't affect the quality. Keep the JPEG/PNG/GIF quality slider on 100% so the images don't receive any compression (which would affect quality). ![]() That file will need to be optimised again.įor minimal quality loss don't enable lossy minification in ImageOptim so the image doesn't lose too much quality. The optimisation done for the original won't be passed down to the resized image. The color table might change, the pixel color at a specific coordinate is not necessarily the same as in the original. whenever you resize an image you're essentially creating a new file.So you have to process the final file again. Photoshop adds metadata when exporting files even if you optimise the source file.Optimisation should always be the last step. I optimise images for web almost everyday. ![]()
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