Re: Reducing number of colors

On Tuesday 02 July 2013 13:27:00 Chris Wilson wrote:
> On Tue, Jun 25, 2013 at 08:16:22AM +0200, Bernhard R. Fischer wrote:
> > Hi!
> > 
> > Image surfaces are supported as true color (24/32 bit) or 5/6/5 bit
> > pixels.
> > 
> > Is there any native way in cairo to reduce colors to fixed number palette
> > image?
> 
> No, there is nothing inside cairo to perform the quantization you wish -
> it is outside of Cairo's scope.  I would suggest you hook the output of
> your rendering into ImageMagick and use some of its routines to control
> the quantization of the image to a fixed palette.
> -Chris

Hi Chris,

I think that there is some code somwhere which could be used for that purpose 
because it is possible to copy a 24 bit surface to a 16 bit surface which 
obviously requires color reduction.

I already implemented my version of color reduction using the median cut 
algorithm. I'll publish that soon if someone else needs it.

Bernhard

-- 
cairo mailing list
[email protected]
http://lists.cairographics.org/mailman/listinfo/cairo

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)

iQEcBAABAgAGBQJR0sG7AAoJEB2of8NcX/1HbpYH/15cHwCbNPlxhR7dsKPGPwzI
FcMBxtd0mkRolfUXUE+kdIMFI3Th7J+5vYwRbGE/CNidkesUIlmd07/4BS8Jddem
EtO9x2H2lG68lQG8lnDhZQ69iuK6JY7RgwNogGvhg7WnaTvoCu50SkWAriJdQIx3
R4igEZdc5uOAtJieiH884c5p7tTNNzDzVKS8hDrLOb19wN4H09ZLido8zosqx+Oe
x5nSLrZYw7VTrKCkpn1xyMNPoGQ/Epg/SEoSt086zfX/C590sG3G0j6fAC4B6/v9
H2KjAe71j+VnqlTTO8FQ98pD0CVJTAjG5kSfPyRpEYzOH919BrhWdCXUmBZU6V0=
=DdlH
-----END PGP SIGNATURE-----