QTR-Quadtone RIP

Hi Ian,

As Alan and Paul have already noted, the L* values of your 21-step target MUST be in ascending order from white to black. Looking at the numbers you posted, and not finding a target that could possibly produce that result in the QTR download, I'm going to guess that the target you used is a "randomized" one from X-rite or somewhere else. 

Try again using the target included with QTR or one like it. Applications>QuadToneRIP>CurveDesign>Images>21-step.psd 

Alternatively, drop your data into a spreadsheet and sort by L* ascending to get them in the correct order. 

Cheers,
Keith

Keith Schreiber
jkschreiber.com




> On Feb 18, 2017, at 3:34 PM, ian@ianbarberphotography.co.uk [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> 
> I am trying to make a curve but when I try to linearize it, I am seeing the following message at the end of the file
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> 
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> The Lab values are not in order.
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> 
> Cannot be linearized.
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> 
> 
> I printed the munki-21steps.tif file and measured each step individually with the Color Munki and then exported the results L a b
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> 
> 
> I then dropped that file onto the QTR-Linearize-Data.app script which created an -out.txt file which is where I see
> 
> The Lab values are not in order.
> 
> 
> Cannot be linearized.
> 
> 
> 
> Does anyone know what I may have done wrong
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> 
> 
> 
> Column1 - L
> Column 2 - a
> Column 3 - b
>                               	
> 
> 69.170411	2.229375	4.162587
> 38.967692	0.820198	1.544497
> 91.256101	-0.203137	2.426518
> 57.40068	2.058672	3.321924
> 26.076259	0.861397	2.001437
> 77.814396	1.531754	4.07091
> 47.183377	1.147048	1.835083
> 17.622641	1.490708	2.165402
> 64.98	2.272277	3.718938
> 34.99938	0.856993	1.813594
> 87.45355	0.358367	3.219209
> 53.827364	1.898121	2.837888
> 24.797505	0.904512	1.825907
> 73.69646	2.017101	4.294673
> 43.653643	1.001303	1.58205
> 94.769523	-0.762756	1.728522
> 61.048939	2.299934	3.561152
> 31.022183	0.82908	2.025414
> 82.733287	0.98201	3.696157
> 50.63376	1.565484	2.500536
> 21.442101	1.164079	2.080707
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