There are "lossy" ways of compressing PNGs. Much like you can compress a jpeg more by throwing away information, there are tools that can throw away some png information to make the image look similar, but be much smaller. If I'm ok with losing information (eg. reducing the colour palette in a lossy manner) then you can try a lossy tool like pngquant.
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Indeed what I was looking for was lossy method, thank you for recommendation. I had pretty good results to my needs with "Crunch" https://github.com/chrissimpkins/Crunch (pngquant + zopflipng )
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Just gave OptiPNG for a spin and sharing my result, just being objective:
Test image, 5280z1150z24BPP, saved in irfan PNG Q6: 989KB
After OptiPNG, -O5: 900KB
webp, lossless: 542KB
webp, Q75: 258KB
jpq Q75: 491KB (webp Q75 much better image quality)
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hello,
I would like to compress the hell out of an png but Im getting few % of decrease compared to this website where I get about 45%
compresspng.com
Am I doing it wrong or OptiPNG cannot do something that the website is doing?
There are "lossy" ways of compressing PNGs. Much like you can compress a jpeg more by throwing away information, there are tools that can throw away some png information to make the image look similar, but be much smaller. If I'm ok with losing information (eg. reducing the colour palette in a lossy manner) then you can try a lossy tool like pngquant.
Indeed what I was looking for was lossy method, thank you for recommendation. I had pretty good results to my needs with "Crunch" https://github.com/chrissimpkins/Crunch (pngquant + zopflipng )
Just gave OptiPNG for a spin and sharing my result, just being objective:
Test image, 5280z1150z24BPP, saved in irfan PNG Q6: 989KB
After OptiPNG, -O5: 900KB
webp, lossless: 542KB
webp, Q75: 258KB
jpq Q75: 491KB (webp Q75 much better image quality)