QTR-Quadtone RIP

Create your own .txt file with the same values for RGB, like this 21 steps :

0,0,0
13,13,13
26,26,26
38,38,38
51,51,51
64,64,64
77,77,77
89,89,89
102,102,102
115,115,115
128,128,128
140,140,140
153,153,153
166,166,166
179,179,179
191,191,191
204,204,204
217,217,217
230,230,230
242,242,242
255,255,255

Read your target starting from the darkest patch. Save the file with CGATS format. Then open the file with ICC-CREATE-RGB.

Philippe



Le 24 juil. 2011 � 19:27, agoldhammer a �crit :

Is there a source file for the 21 and 51 step wedges? The ColorPort download only has color targets available. I did a Google search and cannot find any B/W patch data sets that are compatible with ColorPort; there was an old link posted by Ernst Dinkla from several years ago that is no longer active. Are you aware of the two data sets? I don't see any in the QTR download. Before I start to create one, I thought I would ask.

--- In QuadtoneRIP@yahoogroups.com, Philippe Bachelier <philippe.bachelier@...> wrote:
>
> X-Rite ColorPort can also be used to create and read test targets. 
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> Philippe
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> Le 23 juil. 2011 � 17:20, agoldhammer a �crit :
> 
> I'm a little (maybe a lot) late to this discussion. You can see the L* curves for the 3800 here: http://www.outbackphoto.com/printinginsights/pi045/essay.html#20070123 but you need to scroll down to about the middle of the page. I'm on a Win7 machine and just went through making profiles using ArgyllCMS to generate and read the patches (i1 Pro to read them). It all worked fine and I could see the difference in the patch set by reading the unprofiled patch set and the profiled patch set. You can see the shift in Excel quite easily. I found the shift to be in the middle of the contrast range and that shadow values were relatively unaffected.
> 
> 
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