PS: Since linear RGB pixels values are typically gamma-encoded representations
of some absolutely recorded brightness, I suppose technically for a
double-exposure you would have to un-encode the gamma (e.g. apply a Levels
adjustment of 0.45 or so), merge the two source layers using Addition blending,
then re-encode (e.g. 2.2 Levels adjustment). I did some experiments using two
layers with black-to-white gradients rotated 90 degres from each other, and the
result of those adjustments was indeed pretty close to the "Screen" blending
mode. That's pretty interesting.
-- Stratadrake
strata_ran...@hotmail.com
Numbers may not lie, but neither do they tell the whole truth.
Date: Sun, 4 Nov 2012 16:18:39 +0100
From: tobias.lu...@hfg-gmuend.de
To: ellimae...@gmail.com
CC: gimp-user-list@gnome.org
Subject: Re: [Gimp-user] double exposure
Hello,
afaik, the "Screen" blend mode is a more accurate reproduction of a
double exposure. However, it will brighten up your image, so if the
two photos weren't underexposed to begin with (which they are when
you actually make a double-exposure on film), you'll have to adjust
the values. Don't worry, the Screen mode doesn't result in clipping,
so usually you don't loose all that much information.
bw,
Tobl
Am 04.11.2012 16:10, schrieb Richard
Gitschlag:
If it's the term I'm thinking of there are maybe twenty
different ways to do this in GIMP. But all of them have one
thing in common - you need to import both source images as
separate layers in the same image window.
From that point you can:
1 - Set the top layer's mode to either Brightest or Addition
(neither one precisely reproduces an actual double exposure, but
they're close)
2 - Keep the top layer's mode Normal and use the Eraser (or a
layer mask) to fade the edges/transition between them.
-- Stratadrake
strata_ran...@hotmail.com
Numbers may not lie, but neither do they tell the whole truth.
Date: Sun, 4 Nov 2012 09:56:58 -0500
From: ellimae...@gmail.com
To: gimp-user-list@gnome.org
Subject: [Gimp-user] double exposure
Is there a way to use this program to create a double exposure
effect? I can do it with my 35mm camera manually while taking
pics. But was not sure if you can create the same digitally??
Thank you!
Jenn
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