Re: Color space transformations in GTK

["Murray Cumming" <murrayc murrayc com>]

> On Thu, 2006-06-01 at 17:16 +0200, Øyvind Kolås wrote:
>> On 5/31/06, Carlos Eduardo Rodrigues Diógenes <cerdiogenes yahoo com br>
>> wrote:
>> > Hi,
>> >
>> > There is any plan to add color spaces conversions in GTK+ (GDK or
>> > Gdk-Pixbuf)? If the answear is no, why not?
>>
>> Pixel format conversions is not a small piece of code and the needed
>> pixel formats varies from scenario to scenario. Most programs will not
>> need such a large general infrastructure and the ones that really need
>> it would probably not be satisfied with a simpler solution.
>
> I think that I understand your last argument. And what I really have in
> mind is a simple solution, more below...
>
>>
>> What functionality is it you miss that you think fits into a GUI
>> toolkit? (color management is a seperate issue to color space(pixel
>> format) conversions according to my interpretation of your question).
>
> I had to make RGB <-> HSL conversions, because it's more intuitive
> change some color properties in the HSL color space. I thinked that we
> could have something like GdkColor for other color spaces and functions
> to convert between GdkColor and the other color spaces.
>
> I think that it will help who want to play with colors in a quick way. I
> don't find this in any other library, and I thinked that GTK+ could be a
> good place for this, because it will become easiest to work with other
> colors representations in GTK+ applications.

In case it's useful, we have some old undocumented RGB <-> HSL color value
conversion code in gtkmm here:
http://cvs.gnome.org/viewcvs/gtkmm/gdk/src/color.ccg?view=markup
(See set_hsl(), for instance)


Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com