About PNGs from portfolio.commishes.com

stsyn
Best Artist - Providing quality, Derpibooru-exclusive artwork
Fine Arts - Two hundred uploads with a score of over a hundred (Safe/Suggestive)
Economist -
Cool Crow - "Caw!" An awesome tagger
The Power of Love - Given to a publicly verified artist with an image under their artist’s tag that has reached 1000 upvotes
Equality - In our state, we do not stand out.
Magnificent Metadata Maniac -
Birthday Cake - Celebrated MLP's 7th birthday
Perfect Pony Plot Provider - Uploader of 10+ images with 350 upvotes or more (Questionable/Explicit)
Artist -

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Everything here is related only for PNGs which was obtained from portfolio.commishes.com, not from ych.commishes.com. Subject of this post may be seen on another sites, though.

In 90% cases PNG is preferred when we decide, what image should be uploaded and stay, and it's okay.

But not when it's png from portfolio.commishes.com .

Look at this:
source image

Portfolio provides thumbnail, which is in indexed PNG — which results in only 256 colors possible. You can clearly see mosaic on zoomed in gradients.

It's possible to extract original quality image from this site (also manually, but it's harder) with this script (see first post for download links). You can do it manually using this link https://portfolio.commishes.com/image/NUMERIC_IMAGE_ID/original/ — like this

Keep in mind, that original can be technically worse — for exampled image thumb is 1920x1847 PNG, but original image is 1717x1652 JPEG — smaller and jpeg. Thumbs are not only in unsuitable format, but also upscaled — very easily noticeable here.

Conclusion: use script to obtain images from this site when possible.
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