QOI: Lossless Image Compression in O(n) Time

Re:QOI: Lossless Image Compression in O(n) Time by formerly_proven on Wednesday November 24, 2021 @02:02PM (#29333757)

You're assigning a color profile to the image in your model - the color profile of the display. Hence no color conversion needed, as source and target match.

What "red" and "green" are has changed quite dramatically with different display technologies. A display designed to meet Rec.2020 can show colors that other displays literally cannot produce and the deviation between the primaries is so big that everything looks like garbage if you don't do a color space conversion. Take some sRGB content and display it on a DCI P3 display. Looks like shit. Humans look like crabs.

> On monitors and displays, sure, those vary, but why allow people to specify a color profile on an image

The sole reason why we have device profiles defining device color spaces is so that we can convert from the image's color space to the device's color space. If images don't have a profile assigned to them, you don't need a device profile.

So you either have both image and device profile, or neither. Just one doesn't make sense.

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Re:QOI: Lossless Image Compression in O(n) Time by sam0x17 on Tuesday November 30, 2021 @01:31PM (#29395635)

But if you were forced to always use the same color profile on images? Why allow more than one? Wouldn't that vastly simplify the problem, as then you just have to worry about the device profile, instead of worrying about variation on both ends?

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