[argyllcms] Postscript to raster

  • From: "Lars Tore Gustavsen" <lars.tore@xxxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Wed, 19 Sep 2007 14:52:31 +0200

I am still a little confused about the rasterizing of the target.
Yesterday I downloaded a tryout version of photoshop7 and installed it
on my linux box. I have tested it against ghostscript. The results are
below. This is a RGB testchart.
First line shows the ti2 file for patch A1.

        % value                 pixel value
77 "A1"  75.096   93.840     8.2011
gs          75.2941  94.1117  7.84314      192  240 20 8bit tif
gs856     75.0958  93.8415  8.2017        191  239 21 16bit png
ps7        74.902   93.7255   8.23529      191  239 21 8bit png

There are two tests with ghostscript. The first one is with an 8bit
driver and the second with a 16bit png driver. The last one is the
closest match to the values in the ti2 file.
I also think the pixel value of the ghostscript 8bit version is quite

This was my first experience with photoshop. My workflow was quite
simple just open and save as png.
I have seen the same variance in colors with cmyk targets.

Do you think the variance above have any influence on the quality of
the resulting profile?

The files can be seen on
http://ltgustavsen.googlepages.com/postscript.zip (53kb)

Lars Tore Gustavsen

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