Re: Difference blend mode has changed?
Re: Difference blend mode has changed?
- Subject: Re: Difference blend mode has changed?
- From: Andrew Rodney <email@hidden>
- Date: Thu, 6 Aug 2009 07:31:21 -0600
On Aug 6, 2009, at 7:25 AM, Roger wrote:
In the past, I remember that I used to be able to arrange the before
and
after images on two separate Photoshop layers. That way, by turning
on the
Difference blend for the top layer image, I would get the "difference"
between the two images and I could easily judge the effectiveness of
my
edits. But not anymore, it seems.
IMHO, a better process is to use the Apply Image command on two open
documents set so that you can more easily see the difference.
In Photoshop, open both documents and the go to Image > Apply Image.
Set whichever image isn't listed as the target as the source.
Set the Channel as RGB. Set the Blending to Subtract, with an Opacity
of 100, a Scale of 1, and an Offset of 128.
If the images were truly identical, every pixel in the image would be
a solid level 128 gray. Pixels that aren't level 128 gray are
different by the amount they depart from 128 gray which is useful. You
can use Levels to exaggerate the difference, which makes patterns
easier to see. With the Offset of 128, its far easier to see
differences.
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