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I believe this has been reported before; I'll let Sascha (our Canon driver maintainer) make the call.

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Same here too.
I can do a photo of CUPS' Printer Test Page if it helps.

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Are you compiling yourself? I think the problem might be caused by one
of the bugs that has already been fixed in cvs. I attached the patch.
If you aren't compiling yourself it is probably the best to wait for
the next beta release.

Index: dither-main.c

RCS file: /cvsroot/gimp-print/print/src/main/dither-main.c,v
retrieving revision 1.59
retrieving revision 1.60
diff -u -r1.59 -r1.60
--- dither-main.c 18 Feb 2008 14:20:17 -0000 1.59
+++ dither-main.c 11 May 2008 00:04:37 -0000 1.60
@@ -1,5 +1,5 @@
/*
- * "$Id: dither-main.c,v 1.59 2008/02/18 14:20:17 rlk Exp $"
+ * "$Id: dither-main.c,v 1.60 2008/05/11 00:04:37 rlk Exp $"
*
* Dither routine entrypoints
*
@@ -254,6 +254,8 @@
(d->x_aspect > 2 || d->y_aspect > 2))
d->stpi_dither_type = D_ADAPTIVE_HYBRID;
}
+ if (d->stpi_dither_type == -1)
+ d->stpi_dither_type = D_ADAPTIVE_HYBRID;
switch (d->stpi_dither_type)
{
case D_PREDITHERED:

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The patch worked.

Yet, i had to set Brightness to 1.5 because colors were way to dark.

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I'm not compiling myself so I'll wait until the next beta and hopefully this fix will make it in there. Many thanks.

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You can try the workaround by simply setting the Dither Algorithm option to Adaptive Hybrid. That will avoid this particular bug.

I could find problems with the 600dpi PHOTO mode (purple, black wash, and what appears like two layers of the image shifted maybe 5mm). This problem occurred both with RGB and CMYK colorspace setting. I did not find any Dith Algorithm option to set. While purple and black appear across the image owing to incorrect color generation, the black color itself is correct for the image where black actually should appear.

300dpi and 600dpi modes work nicely (no image layer shifts) but black appears as a very light grey rather than as black.

I will have to look into this carefully.

I need to correct: the 300dpi and 600dpi modes work as described below for CMYK colorspace selection. For RGB the output looks good, although a little too dark (CUPS test pages show same problem).

I think I should tackle the color issues in small steps, concentrating on the 300dpi and 600dpi modes first, and the 600dpi PHOTO mode later.