XPM Tools

xpmextramask

xpmextramask [-m mask_value] [-n none_value] < input.xpm > output.xpm

xpmextramask extracts transparent pixels from a XPM file which includes transparent pixels, and outputs a mask image of XPM format.

% xpmextramask < .xpm > .xpm

% xpmextramask -m None -n black < .xpm > .xpm

xpmmergemask

xpmmergemask [-m mask_file] < input.xpm > output.xpm

xpmmergemask merges an input image of XPM format with a specified mask image which includes transparent pixels, and outputs a XPM image.

% xpmmergemask -m .xpm < .xpm > .xpm

A mask image is not always contructed of only transparent and mask pixels.

% xpmmergemask -m .xpm < .xpm > .xpm

As an example of combination of xpmextramask and xpmmergemask, keep trnasparent pixels, use netpbm command tools and put back transparent pixels as follows:

% convert -sample 16x16 .xpm .xpm

% xpmtoppm < .xpm |pnmscale -xsize 16 -ysize 16|ppmquant 16|ppmtoxpm > .xpm

% xpmmergemask -m .xpm < .xpm > .xpm

xpmnamecolor

xpmnamecolor [[-s rgb.txt] -d rgb.txt] [-u] [-v] < input.xpm > output.xpm

xpmnamecolor replaces RGB color values with color name in RGB color database which is indicated to /usr/X11R6/lib/X11/rgb.txt as default. '-d <filename>' option sets RGB database file to <filename>. If a color value is missing in color database, xpmnamecolor doesn't replace the color as default, but xpmnamecolor replaces the color value with the closest color name with '-u' option. With '-v' option, this outputs color value like '#c8c8c8' in the place of color name.

% xpmnamecolor -u < .xpm > .xpm

xpmnamecolor is available for another color reducing method of 'convert' command with '-colors' option of ImageMagick, 'ppmquant' command of netpbm and so on. All of images shares a RGB color database and are replaced to the color names by xpmnamecolor with '-u' so that many colors to use are reduced in using the whole images.

xpmtools-0.99.tar.gz

Questions or comments regarding this service? taiji@aihara.co.jp.