[argyllcms] Re: guideline for targen + printarg

  • From: Michael Schulz <ms.typografik@xxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Mon, 05 Oct 2009 13:52:21 +0200

Am 05.10.2009 2:50 Uhr schrieb "Graeme Gill" unter <graeme@xxxxxxxxxxxxx>:

> Michael Schulz wrote:
> 
>> would be a great help to get some advice using targen/printarg. I want to
>> make a target for an inkjet printer (CMYK + CM light) with a larger number
>> of test patches.
>> I thought that -d5 must be the right option in targen. But the printer RIP
>> obviously can not work with more than 4 channels. The most of the patches in
>> the .ps file are almost black and the .tif files are not accepted because of
>> their alpha channels. Using the -f or -N option doesn't change anything.
>> Other questions are: should one include a preliminary profile either an
>> older printer profile or a profile created with a smaller number of test
>> patches, does it make sense to use more than the default white color test
>> patches and should one use single channels and Gray axes steps?
>> I would be pleased to get examples of reasonable command lines for targen
>> and printarg to save me from my confusion
> 
> Hi,
> two things: 1) Argyll won't create ICC profiles for more than 4 inks
> (ie. CMYK). 2) There's no point in trying to profile more inks than your RIP
> handles as output. An often used technique for light inks is that they
> are in fact combined into the dark ink channels, meaning that the RIP
> thinks it is working with a CMYK device.
> 
> A key question is whether you are attempting to create a profile to install
> in your RIP, or whether you are attempting to color manage in front of your
> RIP. If it is the former, then you need to figure out how profile charts are
> to be printed so that they bypass the RIPs color management. Although I don't
> have any detailed knowledge about specific RIPs, other people might, so it
> would help if you would tell us what RIP and printer you are dealing with.
> 
> Graeme Gill.

Hello Graeme, hello list,

thank you for the reply and the indications. What I attempt to do is,
creating a profile with Argyll and then install it into the printer's RIP to
simulate for example ISOcoated_v2.icc either by the classical way or using a
device link profile created with Argyll's collink.
The RIP is called "Color Space Proof" the manufacturer is MMS Heidelberg
(Germany). The RIP can handle device link profiles. The manufacturer has
given the option to install Argyll's CMS into the RIP to create profiles
directly in the RIP software ­ also the option to make iterative profile
corrections using Argyll. The RIP software version (4.2.2) I'm dealing with
came with Argyll's version 0.6 and the profiles created with it only have
low quality.
So far I used basiccolor's CMYKick to create a profile that describes the
printer's gamut to simulate then for example ISOcoated_v2 for proofing.
The printer is a HPDesignJet 10 ps. The behavior of the printer shows
visually a slight red color cast which become obviously in skin tones. The
results measuring the FOGRA-strip_v2 are within the norm (2007).
What I hope is, getting visually better printing results using Argyll's
targen with a large number of patches.

> A key question is whether you are attempting to create a profile to install
> in your RIP, or whether you are attempting to color manage in front of your
> RIP. If it is the former, then you need to figure out how profile charts are
> to be printed so that they bypass the RIPs color management.

Sorry, but I don't really understand what you mean by "to figure out how
profile charts are to be printed so that they bypass the RIPs color
management." - at least how to do this...

Regards
Michael



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