Seeking information about impure grays and blacks in 'Remap color' action

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Gusgsm
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Seeking information about impure grays and blacks in 'Remap color' action

Post by Gusgsm » Wed Nov 17, 2021 6:17 pm

Hello,

Bear with me, please but there are some details in PitStop action lists I am unable to find detailed information about

One of them is related to the criteria PitStop uses to determine what are “impure gray” and “impure black” tones (two suboptions in "Remap color" action, "color" option). (I know and understand the idea of rich black and all that), but:
  • How does PitStop decide what is an impure gray or an impure black? Is it a quantity, a sum of colorants, some kind of algorithm?
  • Is that decision based / dependent on colour management?
  • In any case, is it a setting the user can modify or tweak somehow?
Thanks in advance :)

Gustavo

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john.dean@esko.com
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Re: Seeking information about impure grays and blacks in 'Remap color' action

Post by john.dean@esko.com » Thu Nov 18, 2021 3:56 pm

Gustavo,

Impure Black and Impure Grey are determined by checking if CMY or RGB values are approximately equal. Essentially, is the possible intent to create a gray or black which should be on a single K channel at output. This evaluation is not user-adjustable.

Is there a specific use case that you are trying to address?
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Gusgsm
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Joined: Sat Nov 13, 2021 12:55 pm
Location: Madrid (Spain)
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Re: Seeking information about impure grays and blacks in 'Remap color' action

Post by Gusgsm » Fri Nov 19, 2021 12:32 pm

Hi,

Thanks for answering. I am not addressing a particular situation but trying to document the options in some actions. I just wanted to know the whys and hows :)

Best regards

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