[argyllcms] Re: targen options / Inkjet profiling / profile-editing

Hello Jan-Peter,

I agree, that directly driving the printer with CMYK seems to be the 
only "real" way. Gimp-print seems to support most (all?) Epson printers, 
even at high resolutions, but unfortunately the product spectrum from 
other manufacturers is not covered as well (here again, the likely 
reason is that some manufacturers do not release programming information 
for their printers). Basically, my inkjet also worked with gimp-print, 
but only up to 600dpi, which makes only sense for printing on coated 
inkjet paper, but not for photo printing on glossy paper. And gimp-print 
does not support the high resolution photo modes on my printer.

In the past, I had also created profiles for the printer with gimp-print 
in CMYK mode with 600dpi on inkjet paper, and (even without explicit 
linearization) I was pretty satisfied with the CMYK profiling results 
(today I also found an old CMYK test print, and was positively surprised 
- very nice grayscale). In the mean time I don't use the inkjet printer 
any more for "normal" printing (for this purpose I'm now using my laser 
printer).

For high resolution photo mode and glossy photo paper, one can only use 
the driver from the manufacturer, or Turboprint, and both only accept 
RGB input. Thus for photo printing, driving the printer directly with 
CMYK and using a CMYK profile unfortunately seems not to be an option. 
Turboprint drove the printer over the ink limit for my ink/paper 
combination (-> bleeding of dark colors), and I found no driver settings 
to resolved that (maybe I haven't tried hard enough, but trial and 
error, using controls, where one doesn't know what exactly they really 
do, can be boring). And it also had registration problems on 10x15cm 
photo paper (one side cut-off). So the only left optioen is the driver 
from the manufacturer ...

Regarding a per channel ink limit:
I'm just wondering, is a per channel ink limit really necessary? Doesn't 
a per channel ink limit prevent that objects can be printed with a solid 
primary color? (For instance, even a solid cyan text would be halftoned, 
if the cyan channel is limited to < 100%).

Regards,
Gerhard

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