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Topic: [Guide] A Revisit on Image Files, Filetypes, Filesizes, Duplicates, and Revisions

Posted under General


Just a giant write-up I made to explain the differences between files, in case some users were curious. I hope this clears up the confusion around why some duplicates are allowed and others aren't.

I'm looking to make this more user-friendly to read, but I avoided writing it in Dtext because I'm used to Markdown a LOT more (it allows me to edit much faster).

With all that said, I'll just post the link here to anyone that wants to read it. That Github account is my personal dupe, by the way -- you'll be seeing it more when I publish more danbooru-related things.


Updated by Mikaeri

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  • Mikaeri

    Was recently asked by a user about why some things are written as they are, such as the whole RGBA32 vs RGB24 thing. One predominant example is post #2778961, where the apparent addition of the alpha channel led to an almost 1MB increase in filesize. I suppose that discussion would then become "is the alpha channel meaningful and worth uploading, even if it doesn't store any information, as long as its intended by the artist?"

    Aside from that, I'd also like to mention this: Keep in mind that for most of these "tips" that this only applies to images that are provided from legitimate sources, by either an artist or official publisher. Uploading modifications, even helpful ones, that are third-party edits *should* be avoided, unless you're uploading scans... then in which case it might just be better to request an image replacement in the image replacement thread.

    By the way, I did mention you could Dmail me for any specific questions, but if you feel your question is rather broad or would help to extrapolate a discussion, you're also welcome to bump it here and I'll try my best to help.

    And err, don't be afraid. I know it sounds all technical and stuff but my goal is to help this become easier to understand, not scare off other users out of uploading duplicates or what not because it can be somewhat of a difficult topic at first.

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  • kittey

    Maybe you could extend the part about JPEG artifacts and bigger file size != better. Some help for identifying larger but simply re-saved otherwise identical versions with just more artifacts might be good because we definitely don’t want those.

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  • Mikaeri

    Good point. I'll see what I can do on that front.

    I think in such cases it'd be helpful to talk a little more in depth about how to compare images, for when it's really difficult to tell between two images which has more artifacts aside from simply comparing with the naked eye.

    I don't know how long it'll take for me to get to it though since I'm also currently working on another guide (one that's unlisted) that basically discusses about how to improve uploading habits and the like.

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