# macbethcal?

**URL:** <https://discourse.radiance-online.org/t/macbethcal/3678>\
**Category:** radiance-general\
**Created:** [September 19, 2002, 6:23pm UTC](https://discourse.radiance-online.org/t/macbethcal/3678 "2002-09-19T18:23:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Lars\_Grobe](https://discourse.radiance-online.org/user_avatar/discourse.radiance-online.org/lars_grobe/32/469_2.png) [@Lars\_Grobe](https://discourse.radiance-online.org/u/Lars_Grobe)\
**Post date:** [September 19, 2002, 6:23pm UTC](https://discourse.radiance-online.org/t/macbethcal/3678/1 "2002-09-19T18:23:47Z")

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Hi!

I have problems with macbethcal. I use it with a scanned photo of the  
macbeth-target, as I have some mappings and material definitions to do. But I  
don't reasonable results. If I use the "debug"-option (-d debug.pic), the  
right side of the square (the "calibrated" one ) is black, while I don't get  
warnings by macbethcal itself.

How much tolerance concerning the color fields of the macbeth chart does  
mabethcal provide, e.g how big is the region per color field the program uses  
for it's calculation? And is it ok to have variatons per field, does it  
calculate an average color per field?

Thank You, CU, Lars.

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**Author:** ![Lars\_Grobe](https://discourse.radiance-online.org/user_avatar/discourse.radiance-online.org/lars_grobe/32/469_2.png) [@Lars\_Grobe](https://discourse.radiance-online.org/u/Lars_Grobe)\
**Post date:** [September 20, 2002, 2:21pm UTC](https://discourse.radiance-online.org/t/macbethcal/3678/2 "2002-09-20T14:21:04Z")

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Hi,

I tried some of my better pictures, and I found that the source image was  
simply too bad... I was able to use macbethcal with my other pictures. So I  
only wonder why I am warned if some values are out of range, but I get a  
completely bad .cal-file with the unuseable source file without warning.

CU, Lars.