Hi,

On Tue, 2007-10-16 at 13:04 +0200, Giuseppe Pasquino wrote:

> after few operations, it picks a color from the image (with che
> function gimp_pixel_rgn_get_pixel) to get the guchar value of the
> components of the related color.
> At this point, I need to call the "gimp_by_color_select" procedure

Just use the C wrapper. Have a look at the API reference manual, it's
all nicely documented:
http://developer.gimp.org/api/2.0/libgimp/libgimp-gimptools.html#id2678685

> How do I  manage the guchar values to convert in GimpRGB?

http://developer.gimp.org/api/2.0/libgimpcolor/libgimpcolor-GimpRGB.html#gimp-rgb-set-uchar


Sven


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