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Re: color-rgb-to-hex rounding / color-srgb-to-xyz typos

From: Lars Ingebrigtsen
Subject: Re: color-rgb-to-hex rounding / color-srgb-to-xyz typos
Date: Tue, 19 Jan 2021 04:37:40 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Thomas Frössman <thomasf@jossystem.se> writes:

> 1. color-rgb-to-hex rounding 
> Hi. I was investigating why a simple color space conversion from rgb
> to lab and back via just multiplying a component with 1.0 caused
> colors to change when being converted back. The issue is that even
> tiny changes to a component float in LAB space can bring the color
> value down by 0.00000x or something in RGB and when it's converted
> back to hex it gets a surprising value.
> I think I propose this change making rounding optional so that it
> doesn't affect anyone who is depending on the current behaviour.
> (defun solarized-color-rgb-to-hex (red green blue &optional 
> digits-per-component
> round)

Was this meant to be added to the solarized package, or to the in-tree
`color-rgb-to-hex' function?

> 2. typos (?) in color-srgb-to-xyz typos
> While looking at the issue and referencing the wikipedia sRGB page it
> seems like these values should be changed.. Doing this upset the tests
> a bit though so I didn't take it all the way because I started trying
> to understand how to actually produce test case data that is based on
> some verified numbers and not just the output of color.el's functions.

I don't know, either.  Is this related to bug#41544, perhaps?

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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