Trying to generate linearisation profiles with QTR: results are worse

[pharmacist]

Yesterday I tried to generate linearisation profiles for ABW on my Epson ET-8550 and SC-P900, but instead of improvement the shadows get crushed instead of improvement.

Not sure what I did wrong:

Scanning the target:

saving results in to Cielab txt file and dropping to QTR-linearize.data.exe to linearize the results and then dropping into qtr-create-icc.exe

converting the file to the generated icc and then assigning gamma 2.2 profile to the picture and printing with the ABW-mode: getting crushed shadows......the original file in ABW printing mode was better.

 

[Ink stained Fingers]

Do you have some function available like the Black Point Compensation - BPC - routine for B/W prints ?

 

[pharmacist]

Do you have some function available like the Black Point Compensation - BPC - routine for B/W prints ?

In the conversion to profile I get this:

engine: I can choose Adobe (ACE) or microsoft.icm and BPC is checked, as you can see. I choose relative colorimetric.

Afterwards I attach the gamma 2.2 profile onto the coverted (with help of the QTR linearisation profile) image and then I use the ABW mode to print this converted image using the same setting as I have printed the target (ABW with rendering intent: dark), but the dark shadows get crushed and without the QTR profile the image looks better when printed in ABW: much more shadow details.

 

[Ink stained Fingers]

The darker ranges of the image just disappear in the dark, I'm not familiar with the specifics of the QTR method and why a separate linearization is apparently needed. Do you have the means to create a B/W profile in another way - ColorMunki or i1Match or ...- and compare the print outputs with those profiles ?

 

[pharmacist]

actually the QTR is a method is to linearise the gradient of the picture, because it is not possible to use profiles in the ABW-mode, so crushed shadows (which otherwise will be uniform dark gray area) can lift up and give much more details.