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1994-06-22
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Color Panel
.LANGUAGE english English anglais
Help for the Color Panel
****************************
The Color Panel Dialog Box consists of a row of 5 Panel View Buttons at the top
and 4 Buttons across the bottom of its window:
------------------------------------
[Gam] [Rot] [Lin] [Edit] [Perm]
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[Transmogrify] [Close] [Help]
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The top 5 buttons determine whether or not each of 5 corresponding SubPanels
is displayed. This allows the screen real estate used by the Color Panel to be
kept to a minimum by user selections. The use of each of these 5 SubPanels, and
the 3 buttons at the bottom of the Panel, is given below:
"Gamma values" Sliders and the 3 "Couple" Toggle Buttons
These three sliders control the R, G and B Gamma lookup tables. The
starting values of 170 correspond to gamma values of 1.0 the linear ramp
which makes no changes between the image values and the values used to
control the screen colors. Values greater than 170 bleach the colors;
values less than 170 produce interesting surprises.
The 3 "Couple" Toggles allow you to Couple the sliders so that if you
select one of the Coupled sliders, the rest of them move simultaneously,
to speed up multiple color changes; an unCoupled slider will be ignored,
unless selected directly, in which case it will move by itself.
"Rotate Gamma Tables" Sliders and the 3 "Couple" Toggle Buttons
These three sliders also control the R, G and B Gamma lookup tables, but
they simply take the table(s) and rotate or barrel shift the values up or
down the table so that the end values wrap around and re-enter at the the
opposite end.
The 3 "Couple" Toggles allow you to Couple the sliders so that if you
select one of the Coupled sliders, the rest of them move simultaneously,
to speed up multiple color changes; an unCoupled slider will be ignored,
unless selected directly, in which case it will move by itself.
"Linearize Gammas" Buttons
These 4 buttons force the selected R, G or B table(s) to contain a linear
ramp with values from 0 to 255. The default setting consists of 3 linear
ramps.
"Invert Gammas" Buttons
These 4 buttons load each of the selected R, G or B table with a new
ramp of values containing, in any entry, the value 255 - i, where i was
the old value. Two Inversions of a table will restore the original table.
"Edit RGB value" Panel
This panel contains several widgets which allow you to edit specific colors
within the image itself, as opposed to altering colors via the Color
Map. The process involves these steps (Note: you MUST use the Color Panel
corresponding to the WW containing the image you are about to edit):
Select a "Current" Color
Use the LEFTMOUSE Button to select the color you wish to edit
in the Work Window image. That color will be displayed in the
"New" display field.
[Optional] Set the "Tolerance"
The Tolerance field has a default setting of 3 (determined by
a user-editable Resource file value). Edit this value if you
wish to alter a broader or narrower spectrum of colors. See
the explanation of the "Apply" button for more on "Tolerance".
Create a "New" Color
Use the R, G & B Sliders to create a "New" color patch. The
numbers at the right hand end of the sliders show the actual
R, G & B pixel values for the color in "New". You can keep
changing the "New" color and selecting Apply (and, optionally,
changing Tolerance) to make a series of changes to the same
pixel selection. Note: if your alterations cause a "New"
color to become equal some other previous color in the image,
the two sets of image pixels will not be distinguishable
thereafter.
"Apply" Button
Selecting this button causes all the pixels in the image that have
color values in the range (where: t = "Tolerance" and R, G, B are
the "Current" values):
(R - t, R + t), (G - t, G + t), (B - t, B + t)
to be changed to: R_New, G_New, B_New.
NOTE: these types of editing changes cannot be reproduced by
recomputing the image. The edited image must be saved by a
Work Window Drag & Drop to a Film Strip, which can then be
Saved to disk.
"Byte/gun map" 9-Button Matrix
This matrix of 9 buttons, arranged as a matrix of Toggle Buttons,
permits the user to select how the R, G & B byte components (in the
image in RAM) are to be mapped into the frame buffer (which determines
the order in which the colors are fed to the CRT's guns, hence the label:
"Byte/gun").
If 3 buttons are selected from the same row, a black & white image of
the selected color component of the RAM array is produced. Notice that the
image takes longer to refresh if the mapping is not R->R, G->G and B ->B,
because of the time taken to swap the bytes as the image rows are written
from RAM to the frame buffer.
"Transmogrify" Button
Recomputes the color values in the image so that the new values,
in conjunction with linear gamma ramps and a default Byte/gun mapping,
produce the original image. This locks the current colors into an image
without requiring the User Interface colors to be altered. Transmogrify
takes place automatically in a Larger-than-CRT image under the Work
Window "Compute image to file" command.
"Close" Button
Closes this Color Panel.
"Help" Button
Opens this text window.
.LANGUAGE french French Francais
C'est le help pour la Color Panel