It doesn't make any difference which layer is on top, but they must me
separate scans, one optimized for shadows and one for highlights.
Contrast masking is a more advanced and more powerful option but requires
selecting a channel for an illumination mask and then using an adjustment
layer with the illumination mask to make contrast adjustments.The trick then
becomes selecting the right channel and maybe inverting it to achieve the
desired result.
Experiement with dragging the desired channel to the "load channel as a
selection" icon on the channels palette, then go to layers palette and
select an adjustment layer (levels or curves). A mask is automatically made
to the adjustment layer. This mask can be inverted, painted on, or otherwise
adjusted.
Bob Wright
----- Original Message -----
From: "Julian Robinson" <jrobinso@pcug.org.au>
To: <rew@impulse.net>
Sent: Monday, January 07, 2002 8:52 PM
Subject: [filmscanners] Re: Tips needed on difficult scan
Being endlessly interested in contrast taming, I just tried this but
obviously I am missing something because I can't get it to work. I
certainly don't understand how it works, mostly because I don't know what
"screen" does :( Is the technique assuming the dark or light image on top,
or doesn't it matter?
It does remind me though of the other semi-automatic way of improving high
contrast images which works quite well, although if overused gives some
strange effects on the light-dark transitions and at the edge of image.
Contrast masking...
- Image needs to be in 8-bit which is a shame.
- duplicate it into a second layer
- desaturate top layer and invert (make it a negative of itself)
- select OVERLAY as mode
- gaussian blur this top layer to 20-70pixels until you get the best effect
- reduce the effect if necessary by reducing transparency of top layer
Julian
At 12:07 08/01/02, you wrote:
>I apologize if I'm getting into some else's discussion, but I suggest the
>following:
>
>1. make the top layer active and choose blend mode screen
>2. move the opacity to 30-40 %
>3. you can make further adjustments on adjustment layers added to each of
>the two scans.
>I'm assuming you have the two layers registered, this can be checked by
>using blend mode difference temporarily (the image should go black).
>
>Bob Wright
>
>----- Original Message -----
>From: "S Schwartz" <snsok@swbell.net>
>To: <rew@impulse.net>
>Sent: Monday, January 07, 2002 2:45 PM
>Subject: [filmscanners] RE: Tips needed on difficult scan
>
>
>Maris,
>
>Having layered two such images, I am not clear how to blend them. I have a
>similar situation in which shadow detail is lost in many small regions of
>the image.
>
>I tried layering the dark on the light and erasing parts of the dark layer
>where I wanted the shadow detail to show through. Is that what you meant?
>
>Stan
>
>-----Original Message-----
>From: filmscanners_owner@halftone.co.uk
>[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of
>mlidaka@ameritech.net
>Sent: Monday, January 07, 2002 9:58 AM
>To: snsok@swbell.net
>Subject: [filmscanners] Re: Tips needed on difficult scan
>
>
>Try making 2 scans - one optimized for the highlights and one for the
>dark area, and then layer them.
>
>Maris
>
>On Sat, 05 Jan 2002 00:01:17 -0800 "Ken Durling" wrote:
> >
> >
> >
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