Re: Is this a scum dot?
Re: Is this a scum dot?
- Subject: Re: Is this a scum dot?
- From: Roger Breton <email@hidden>
- Date: Thu, 21 Nov 2002 08:25:35 -0500
Thank you very much Bruce.
Would you mind extrapolating your numerical analysis technique for an "8-bit
to 8-bit" workflow?
This is most revealing.
>
If you repeat that calculation for *your* IT8 reference file values and
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*your* desired RGBmin and RGBmax, you get a table of target RGB values for
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all 22 IT8 grayscale steps. Then adjust your scanner tone curves or gammas
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so that these target RGB values are most closely achieved (making sure
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though, that you always get separation between adjacent grayscale steps!).
>
Note that this technique is best used for a bit reduction tone curve (e.g.
>
16-bits down to 8-bits). Probably not such a good idea for 8-bit to 8-bit,
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since in that case you will lose tones.
>
>
Just an idea for the more adventurous types...
>
--
>
Bruce J. Lindbloom
Regards,
Roger Breton
Laval, Canada
email@hidden
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