[argyllcms] Re: Printing using an ICC profile
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 22 Jan 2010 08:24:04 +1100
Pedro Côrte-Real wrote:
I was just trying not to waste too much paper. 600 was just a random
guess on my part. How many should I aim for for a good profile?
For a well behaved "RGB" printer, somewhere between 600-1000 is good,
but it depends on expectations. It's hard to use too many patches for
a badly behaved printer. [A badly behaved printer is one in which
an even spread of device values does not result in an approximately
perceptually even spread of colors.]
If you've generated the three 200 point charts independently (ie.
they aren't re-prints of each other), and they are all under
the same printing conditions, then another thing you could
try is to concatenate all the results and generate a profile
from that. It may "fill in the gaps" a bit, although it
won't be near as good as a deliberately made 600 point
chart.
You can concatenate using a text editor or spreadsheet program
on the .ti3 file. Just make sure that the NUMBER_OF_SETS is
set correctly for the total number of points. The SAMPLE_ID
and SAMPLE_LOC are ignored by colprof.
I took the -d3 from the docs. I assumed it had to be that because the
profile was for RGB not CMYK even though eventually gutenprint is
going to convert it into device space. Is this not the case? If it is
Right, but in V1.1.0 -d2 selects "Print RGB", which gives targen
a few more clues that it's really a printer, and not a display.
[Sorry, not all of the doco has caught up with this change yet, but
targen -? indicates this.]
Graeme Gill.
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