Re: Canned or custom camera profiles?
Re: Canned or custom camera profiles?
- Subject: Re: Canned or custom camera profiles?
- From: Andrew Rodney <email@hidden>
- Date: Sat, 14 Oct 2006 15:34:47 -0600
- Thread-topic: Canned or custom camera profiles?
Title: Re: Canned or custom camera profiles?
On 10/14/06 3:25 PM, "Marco Ugolini" wrote:
> How does this procedure of "applying the opposite color correction" work in
> actual practice? Is there an easy way to apply the *opposite* of a color
> correction (be it a curve and/or a levels or saturation adjustment)?
Yes, you use Photoshop to edit the opposite effect you want on the target (I discuss it in my book). Works for scanner profiles too of course:
Let’s assume that the scanner profile appears too dark. I open
a scan of a test image with this profile applied. I edit this image in
Photoshop using curves to lighten the color appearance. The correction in
this example was input 121/output 141, which lightens the midtones. I
then carefully invert this correction on an adjustment layer. Input would
be 141, output would be 121. This darkens the midtones in the opposite
direction. I then apply this edit on the original scan of the IT8 target.
It is possible to simply drag and drop the adjustment layer from the test
image to the IT8 image. If you do this, flatten the layer and save a copy
to disk. Now use this modified scan of the IT8 target in your profile
package to build a new scanner profile. I load this darker IT8 target into
the profile package to build a new profile. The new scanner profile will
be lighter in the midtones due to this edit. This takes a bit of back and
forth testing—some testing and experimentation is required.
Andrew Rodney
http://www.digitaldog.net/
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