Currently you can choose HSV and RGB to select the color. However, those don't represent the perceived colour because it's actually the srgb format. When somebody wants to halve the brightness, he/she may halve the V value in HSV and wonders why it looks so dark or doesn't notice the problem at all. I'd like to be able to change the luma value or something similar.
[Here's more information about the gamma error](http://www.ericbrasseur.org/gamma.html)
Unfortunately the colour chooser is a standard dialog provided by the GTK toolkit and not something Geany controls. Apparently some versions of the toolkit even provide a totally "dumbed down" version that just shows the Palette.
The only way to control it would be for somebody to implement a new version of the dialog.
But remember its for coding, not image manipulation, its main use-case is for choosing the colour and getting the numbers to plug into the program/HTML/whatever.
Closed #1777.
Closing since the colour chooser widget being discussed has been deprecated by GTK+ and as mentioned isn't in our control anyway.
@HybridDog you could make a request for the Geany-Plugins project to add a new plugin with a good colour chooser dialog. If someone was motivated, I think GIMP has several really good colour chooser dialogs, perhaps their code could be re-used in a new plugin.
I think, since the colour chooser is from GTK, it should be changed there. I'm not keenly interested in having a good colour chooser dialog plugin because l rarely use the colour chooser and l assume implementing a portable eyedropper is not worth the effort.
As @codebrainz said the colour selector dialog in GTK2/3 is deprecated, so it will be "fixed" by removal in GTK4. It is replaced by a RGBA only https://developer.gnome.org/gtk3/3.22/GtkColorChooserDialog.html.
Enjoy.
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