[Gimp-user] Need help removing/replacing a color

[rich2005 <forums gimpusers com>]

> Hello,
>
> For about an hour enough, I've been trying to remove this really nasty
> yellow from an icon that I'm making.  I've been through tutorial after
> tutorial to no avail.  If at all possible, I'd like to make the yellow
> areas grayscale, the end goal being a black and white icon with red
> spotcolor.  The image is PNG if that makes any difference.  I've
> attached it to this thread.  If you have any tips, I'd greatly
> appreciate them.  I'm about to rip my hair out.  x_x
>
> Thanks!

Several ways to get some sort of result. Try:

Duplicate layer
Desaturate (luminosity) the top layer
Add a layermask to the top (desaturated) layer
Paint (carefully) in black to uncover the red areas, white to cover up again.
see: https://docs.gimp.org/en/gimp-layer-mask-add.html

When complete save as a gimp xcf to retain layers, mask etc. When happy, export
as a png / or ...whatever.

attached xcf as example.

rich: www.gimp-forum.net

Attachments:
* http://www.gimpusers.com/system/attachments/415/original/keepersample.xcf

-- 
rich2005 (via www.gimpusers.com/forums)