Re: BPC
Re: BPC
- Subject: Re: BPC
- From: "eugene appert" <email@hidden>
- Date: Mon, 22 Oct 2007 11:05:26 -0400
Klaus ,
Thank you for the reference, If I was able to follow this document, I not
sure that I was, It seems to be explaining in great lengths how BPC
determines the target black point. But nothing about how it translates
values above the black point or about how it is affected by the a* and b*
axes when compressing the L* axis. This document was helpful in dispelling a
myth about BPC. I was always lead to believe that BPC was more sensitive or
intelligent than perceptive rendering, which is often describe as being
completely blind to file data.
Apparently BPC is just as blind to file data. The document you referred me
to states this clearly. Since reading the Adobe document I tested a
conversion of the L* chart from which I removed all patches below L*20. The
translation of the remaining patches produced exactly the same results
whether the file contained values below the BP or not. I have also been
able to confirm my suspicions about BPC and colour information since my
initial post. I modified the L* chart by inserting colour patches inside the
L* patches of exactly the same brightness. The results proved that PBC is
sensitive to the a* and b* axis and that its translation of colour values is
far less linear, as if its trying to make tonal distinctions using colour.
Thanks for your help
Eugene
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
- Follow-Ups:
- Re: BPC
- From: Klaus Karcher <email@hidden>