Re: BPC + Perceptual + ISO Newspaper v4
Re: BPC + Perceptual + ISO Newspaper v4
- Subject: Re: BPC + Perceptual + ISO Newspaper v4
- From: Martin Orpen <email@hidden>
- Date: Mon, 1 Dec 2008 20:50:11 +0000
On 1 Dec 2008, at 17:07, Todd Shirley wrote:
Does anyone know why some profiles give different results with BPC
checked on or off in the perceptual intent, but others do not?
Because the profiles are malformed?
That's Adobe's reasoning:
"Color conversion using Perceptual intent already maps source white to
destination white and source black to destination black. Because this
mapping preserves the relationships of the shades, it is unlikely that
a whole shadow section will be mapped to the same black value.
Therefore, BPC should not be necessary. BPC is available, however, for
this rendering intent, to be used with malformed profiles. For a given
picture, the user can decide whether using BPC improves the color
conversion and can select it or deselect it accordingly.
BPC is available for color conversion using the Saturation intent. As
with Perceptual intent, the user may or may not find that selecting
BPC improves the conversion of a given image."
-- Black Point Compensation, Adobe Systems' Implementation
If you have trouble sleeping this evening, you can read the rest here:
<http://www.color.org/AdobeBPC.pdf>
Regards
--
Martin Orpen
Idea Digital Imaging Ltd
_______________________________________________
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