Re: [Lcms-user] Re: Problems with black point

[Marti M. <ma...@li...>]

Hi,

Do you have tried the new profiler?

This may be due to scanner noise, as Gerhard says. In the new profiler there is a
merit figure  for identifying noise. When you pick the samples, in the Picker dialog
there are 3 fields labeled as "Signal-to-noise depth bits". These are the effective
bits per sample used in the scanout. A value of 6 or more is very good. Below 5 
is going to give these artifacts. Choosing "Mode" instead of "Mean" could also
minimize the effect.

But anyway, the new profiler should do a better job on the highlights and shadows..

http://www.littlecms.com/lcms_profiler_beta1.exe

Regards,
Marti Maria
The little cms project
http://www.littlecms.com
ma...@li... 

----- Original Message ----- 
From: "Jacek Zagaja" <jz...@po...>
To: "lcm...@li..." <lcm...@li...>
Sent: Saturday, September 27, 2003 10:17 AM
Subject: [Lcms-user] Re: Problems with black point


Gerhard,

Good to hear I am not alone. I used full resolution polynomial. From
my side I can check Profile Maker 4.15 if necessary. 8 bits RAW
profiles are free from that and TRC profiles also. I haven't tested
new 16 bits LCMS.

The problems reffer to white point also. Exposure seems to be critical
for lut profilers. For example I used target which was underexposed
(170 white) so observe how many artifacts create that full resolution
clut LCMS profile:

http://tme.szczecin.pl/~jacek/temp/LCMS/lcms_white.jpg

TRC profile:

http://tme.szczecin.pl/~jacek/temp/LCMS/xlp_white.jpg

Surely Marti know about this matter.

Best regards -- JZ.



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