[Ted] :ted: Ted Hart-Davis :breadified:

Converting PNGs to webp 

What proportion of a storage reduction are we anticipating? (Being intentionally vague about the content of the PNGs, but they're Minecraft map renders)
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:cate: This is Mur :scremcat:

Converting PNGs to webp 

@Ted
Google claims 45% though it ofcourse depends upon the image

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iced depresso

re: Converting PNGs to webp 

@mur2501 @Ted take one and compress it? :blobcatshrug2:

```
ffmpeg -i minecraft.png -compression_level 9 minecraft.webp
```
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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@icedquinn @mur2501 ffmpeg can create webps?
And testing one or even a thousand would probably not give me a realistic representation due to the variability
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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@icedquinn @mur2501 ...phrasing, ted! it's important.
Due to the variability throughout the set, I would need to do like a thousand samples at random to get a good idea.
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:cate: This is Mur :scremcat:
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re: Converting PNGs to webp 

@Ted @icedquinn
As WebP is a lossy compression format (though it has a lossless variant too) it should give a file size always lesser then the lossless PNG

· · Tusky · 1 · 0 · 1
[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@mur2501 @icedquinn I thought that cwebp did lossless by default, am I super the wrong?
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iced depresso

re: Converting PNGs to webp 

@Ted @mur2501 webp supports lossless. getting your compressor to obey that varies.
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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@icedquinn @mur2501 I see. Time to start over (:
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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@icedquinn @mur2501 Well, it took...like 1200 minutes, but it finished. And from my ~76GB of small images, it took me down to ~69GB (nice). Time now for me to actually go for it with the lossy and see whether I can tell the difference (beyond the size)
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:cate: This is Mur :scremcat:

re: Converting PNGs to webp 

@Ted @icedquinn
That's around 11% reduction in compression ratio, very less then the 26% ratio for lossless claimed by Google

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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@mur2501 @icedquinn well, this was by far not the best set of images to try it with -- especially being efficient PNGs
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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@mur2501 @icedquinn mhh speaking of compression, what compression factor should I go for? I guess I'll start with the default, which is apparently 75...whatever that means.
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:cate: This is Mur :scremcat:

re: Converting PNGs to webp 

@Ted @icedquinn
I want to see the results with the 100% factor

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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@mur2501 @icedquinn 18.4GiB with the default lossy. Refreshing the environment then trying with 100% factor
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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@mur2501 @icedquinn ...68G
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:cate: This is Mur :scremcat:

re: Converting PNGs to webp 

@Ted @icedquinn
68Gb compressed to 18.4??

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[Ted] :ted: Ted Hart-Davis :breadified:

re: Converting PNGs to webp 

@mur2501 @icedquinn in the message you replied to, I was showing basically no difference with 100 factor. That small size for using the default quality factor, yes
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iced depresso

re: Converting PNGs to webp 

@mur2501 @Ted google tested it on a smorgasboard of web images didn't they?
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