cedit - edit colors on the screen
The frame buffer of the IRIS contains values which are translated into
RGB values by a color map for applications in color map mode. Cedit
changes the mapping of any color index. Three sliders are displayed,
along with a sample patch of the color being edited. Normal operation is
to establish input focus by placing the cursor within the cedit window
then press and hold the Alt key down. While continuing to hold the Alt
key down move the cursor outside of the cedit window and click the left
button to pick up a color index to be edited. The sliders indicate the
red, green, and blue components of the current color. Once the color map
index has been picked, release the Alt key and return to the cedit window.
The color can then be changed by clicking down on a slider in
cedit, and adjusting the position of the control. Under each slider control
is a number representing the current value of that color component.
The number ranges from 0 (for least intensity) to 255 (for most intensity).
Under the color patch is a number that represents the current color
index. The user can toggle between decimal and hexidecimal representations
of the current RGB values being displayed via the menu item "toggle
It is not possible for cedit to know if the window you are selecting a
color from is single or double buffered. This can be a problem on
machines that have only 8 bitplanes. cedit can be made to interpret data
as single or double buffered via the last item in the menu. This menu
will toggle between choices. The menu shows up on 8 bit machines only,
since it is not a problem on other machines.
If another process changes the color entry being edited, the sliders of
cedit do not indicate the correct positions for that color index.
This program must have input focus in order to work properly. See the
window manager documentation for a discussion of input focus.
cedit only knows about the frontbuffer. If the queried pixel belongs to a
double buffered window, it is possible for cedit to grab from the wrong
buffer. When the window swaps buffers, cedit will be able to grab the
Some applications use dithered colors so the index and color of adjacent
pixels will be different for some regions of the screen.
Systems with multiple color maps are confusing. Cedit can only edit the
color map currently installed in the hardware colormap. Applications
with their own color maps cannot be edited unless their colormap is
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