If no gif-file is given, gif2herc will try to read a GIF file from stdin.
Quiet mode. Defaults off on MSDOS, on under UNIX. Controls printout
of running scan lines. Use -q- to invert.
Sets size of dithering matrix, where dither can be
2,3 or 4 only (for 2x2, 3x3 and 4x4 dithering matrices). Default is 2.
Note: the image will be dithered only if the mapping (see -m)
selected dithering mode.
Sets zoom factor of the image. Zoom factor should be
power of 2 up to 256. Default is 1 (no zoom).
Sets threshold level for B&W mapping in percent.
This threshold level is used in the different mappings as selected via -m.
Default is 19%.
Select method to map colors to B&W. Mapping can be:
Every non-background color is considered foreground (white).
0.3 * RED + 0.59 * GREEN + 0.11 * YELLOW > BWThreshold is considered white.
Colors are mapped as in 1, and use dithering of size as defined using
-d option. BWthreshold is used here as scaler.
Default is option 0, which is much faster than the other two.
Invert the image, i.e. black -> white, white -> black.
Disable beeps. Every time the image is complete, or a wrong key was
presses, sound is generated. The -b option disables that.
Print one line of command line help, similar to Usage above.
Once the image is displayed, the program goes into an interactive mode
which recognizes the following commands:
C - get Color and position
In this submenu, a cursor appears and the location and color of the
pixel underneath it are printed. The 4 arrows may be used (shifted for
faster movement) to move the cursor. Any other key will abort this
D - zoom Down
Zoom down by factor of 2 unless current zoom factor is 1.
H - Increase dither matrix size
...unless current size is maximum (4), in which case size is set
to minimum (2).
I - Invert
Invert the image, i.e. white -> black, black -> white.
M - Method
Increment color -> BW mapping method, unless current method is maximum
(2), in which case method is set to minimum (0).
R - Redraw
Redraw the image.
S - print Status
Print status of image and program.
U - zoom Up
Zoom up by factor of 2 unless current zoom factor is 256.
The 4 arrow keys can be used to pan in the desired direction, if the image
overflows in that direction. If the image fits into the screen, arrow
keys are ignored. The panning steps are 1/2 screen if not on image end.
SPC - abort
Space bar may be used to abort current image drawing.
ESC - abort
Escape may be used to abort current image drawing.