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Next: xpick and dvips Up: xpick---Pick images on Previous: More about PostScript


In Figure gif you see an image that was used for testing PostScript pixmap rendering times on various printers.


It is a colour image with a size 612x631 pixels and corresponds to a PAW++ graphics window. The original image was grabbed on a computer workstation screen by xpick and transformed into a .gif file. Then it was visualized using the xv program and saved into three different PostScript files, one containing an uncompressed image, one with a RLE compressed image and one with a LZW compressed image. The first two files were obtained using the save facility of the xv program, while the last one was made using xpick itself. Then a small PostScript routine was added to the three files to measure the rendering time and the files were printed on five different printers. The results are presented in table . As you can see both compression methods (RLE and LZW) save a lot of disk space, but files produced by xpick also print much faster, especially on level 2 PostScript printers.

Janne Saarela
Tue May 16 13:43:26 METDST 1995