gifbg(1)
NAME
gifbg - A program to generate a single-color test pattern GIF with
gradually changing intensity in any of the basic 8 directions.
USAGE
gifbg [-q] [-d Dir] [-l #Lvls] [-c R G B] [-m MinI] [-M MaxI] [-s W H]
[-h]
The gifbg program reads no input, and will dump the created GIF file to
stdout.
MEMORY REQUIRED
Line.
OPTIONS
- [-q]
- Quiet mode. Defaults off on MSDOS, on under UNIX. Controls
- printout of running scan lines. Use -q- to invert.
- [-d Dir]
Select direction the intensity of the background should- increase. Direction can be one of the 8 principal directions:
- T - for Top "TR" - for Top Right "R" - for Right "BR" - for Bottom Right "B" - for Bottom "BL" - for Bottom Left "L" - for left "TL" for Top Left
- The compass directions may be use as synonyms for the above directions, so for example "NE" is equal to "TR".
- Direction is case insensitive. The default direction is Top (North).
- [-l #Lvls]
Number of levels the color will be scaled to. Default is 16.- [-c R G B]
What to use as the primary background color to scale. This- color is scaled between the minimum intensity (MinI) and maximum intensity (MaxI) from one end of the screen to the other as defined by Dir. See below (-m & -M) for MinI & MaxI. Default is Blue (0, 0, 255).
- [-m MinI]
Minimum intensity (in percent) to scale color. Default 10%- [-M MaxI]
Maximum intensity (in percent) to scale color. Default 100%- [-s W H]
Size of image to create. Default 640 by 350.- [-h]
Print one line of command line help, similar to Usage above.
NOTES
If MinI == MaxI = 100 (%) and #Lvls == 2 then boolean mask image of
specified size will be created - all foreground. This can be used as a
square mask for the <a href="gifcomb.html">
AUTHOR
Gershon Elber
- Man page created by T.Gridel <tgridel@free.fr>, originally written by
Eric S. Raymond <esr@thyrsus.com>