[argyllcms] Re: Gutenprint and ink limits.
- From: "Lars Tore Gustavsen" <lars.tore@xxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 8 Aug 2007 14:43:52 +0200
On 8/8/07, "Gerhard Fürnkranz" <> wrote:
> Yes, of course. If the darkes patch which can be printed
> by the printer/driver/rip deviates from neutral, then a
> profile might even choose a somewhat brighter, but more
> neutral color as "black" (depends on the profiler).
Thanks again. It's nice to have my conclusions verified.
I tested after my last e-mail printing a few different dark cmyk
testpatches. After goggling the topic I created four different, and I
hoped that one of them is as dark as possible.
$ convert -colorspace cmyk -size 300x300 -density 300
"xc:cmyk(100%,100%,100%,0%)" cmyk-100-100-100-0.tif
$ convert -colorspace cmyk -size 300x300 -density 300
"xc:cmyk(100%,100%,100%,100%)" cmyk-100-100-100-100.tif
$ convert -colorspace cmyk -size 300x300 -density 300
"xc:cmyk(0%,0%,0%,100%)" cmyk-0-0-0-100.tif
$ convert -colorspace cmyk -size 300x300 -density 300
"xc:cmyk(63%,52%,51%,100%)" richblack.tif
I printed each of them with cinepaint "direct printing cmyk". The file
cmyk-0-0-0-100.tif was not printed at all with cinepaint. The paper
just spooled through the printer. Photprint printed it. I then created
a bigger canvas with an c0,m0,y0,k100 rectangle inside. This time it
was printed with cinepaint.
My measurement is taken with spotread, with fwa compensation on the paper.
100-100-100-0.tif Result is D50 Lab: 12.148500 -3.201308 -0.708121
100-100-100-100.tif Result is D50 Lab: 13.460757 -0.906329 -3.565527
0-0-0-100.tif Result is D50 Lab: 19.964830 0.008343 7.505049
richblack.tif Result is D50 Lab: 11.210768 -4.049849 1.246078
My conclusion is that the gray step mentioned in previous e-mail is
printed correctly, and I have to figure out how to calibrate
gutenprint, or accept a lab value around 11-13.
Regards
Lars Tore Gustavsen
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