The Channel dialog lets you manage and pick up new colors. It is divided
into five separate parts: GIMP, CMYK, Triangle, Watercolor and Scales. You
can use the eyedropper, which is the last button of the dialog, to pick up
a color anywhere on your screen.
The dialog can be called in the following ways :
from the toolbox-menu:
from the toolbox: click on the current Foreground or Background
from the image-menu:
from an other dialog-menu:
Using the dialog
The GIMP Selector
With the GIMP
Color Selector, you select a color by clicking on a
one-dimensional strip located at the right edge, and then in a
two-dimensional area located on the left. The one-dimensional
strip can encode any of the color parameters H, S, V, R, G, or B,
as determined by which of the adjoining buttons is pressed. The
two-dimensional area then encodes the two complementary color
You get to this selector by clicking on the printer icon. The CMYK
view gives you the possibility to manage colors from the
The Triangle selector is made up of a
that allows to select Hue by click-and-drag a small circle and of
that has also a small circle to vary intuitively Saturation and
This color selector is symbolized by a brush. The function mode of
the selector is a little different than those of the models
presented so far. The principle consists of changing the
current foreground color by clicking into into the rectangular
palette. If the current foreground color is for example
white, then this is reddish toned by one clicking into the red
color area. Repeated clicking strengthens the effect. With the
sliding control, which is right apart from the color palette, you
can trim the color quantity by which with every mouse click, it
takes up. The further the sliding control is above, the
more color taken up per click.
This Scales exists only in the color selector you get from the
file menu of the Tool-Box or from the Dialogs menu in the image
This selector displays a global view of R, G, B channels and H, S,
V values, placed in sliders.
This color picker exists only in the color selector you get from
the file menu of the Tool-Box or from the Dialogs menu in the
image menu bar.
The color picker has a completely different behaviour, than the
color picker tool.
Instead of picking the colors from the active image, you're able
to pick colors from the entire screen.
As described above, the color selection tool started from the toolbox
file menu and the image menu is different from the color selection
tool started in any other way. In the first tool, in the lower part
of the dialog, is showed the current foreground and background
colour. One of the two colors is in each case, recognizable actively
from a thin grey framework, which surrounds the active color box. In
order to activate a color box, you can simply click on the desired
box. All the modifications you do with the color selectors, apply to
the active color box.
Right up you find a symbol, consisting of two arrows, with which you
can exchange the foreground and background colour. At the bottom left
of the dialog, just below the foreground color block, you find a
switching surface with two small, one black and the other white,
partially overlapping squares. If you click on these, the front and
background colour are put back to black and white respectively.