In Figure 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
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.