SFINX software tree - Images - giftool
Giftool is a program to manipulate GIF
images in various ways.
Interlaced GIF
Interlaced GIFs (very nice for use on your WWW page)
can be created using the -i option of giftool.
Interlacing can be turned off with +i.
Transparant color
One color in the image can be made transparant, i.e. it will take on the color
of the background (e.g. in Netscape). This color can be selected using
giftool's -rgb option:
- -rgb colorname specifies color by name (e.g. white)
- -rgb ##,##,## specifies color using red, green and blue
values. The option -p can be used to obtain the colors
in the image.
- -### use colormap index to determine transparant color.
Comments
GIF images may contain a comment text. This text can be displayed using the
-c option. The option +c can be used to
add a comment to the file; -C (capital C) can be used to
remove such a comment.
Output
Giftool can run in "batch mode" when the -B option is used.
In this case, the program will write back to the original file name. No backup
is made !!
Otherwise, the -o option can be used to specify the output
file name.
David.Jansen@strw.leidenuniv.nl
Last modified: Fri Dec 1 15:01:40 MET 1995