Re: [PATCH] color-hsv-to-rgb

[Jim Porter]

On 10/16/2023 12:59 AM, Stefan Kangas wrote:
> Dov Grobgeld <dov.grobgeld@gmail.com> writes:
>
> > I would like to do my first(!) contribution to emacs with the attached
> > patch. Is there interest, or is it too trivial? Do I need to do a copyright
> > assignment? Is there a guide for dummies on how to do that?
>
> Welcome to Emacs!
>
> I don't see why we couldn't take a patch implementing the inverse of
> `color-rgb-to-hsv', so I think there's interest.  It would be
> interesting to know what you need it for, though.

For what it's worth, I thought about adding this function too. I would 
use it for a custom theme to choose colors for 'vc-annotate'. My 
hypothetical code would take a starting color (in RGB), convert to HSV, 
and then increment the value component to produce gradually lighter 
colors. After that, I'd need a way to convert back to RGB to make the 
hex string for the face attribute, hence this new function.

(Even better would be conversions between RGB and LCh, but that's a 
bigger project.)