Graphics Programs Reference
In-Depth Information
Step Three:
If you want to use these RGB curves to
create a cross processing effect (a clas-
sic darkroom technique from the film
days), it's actually fairly easy. There are
dozens of different combinations, but
here's one I use: Start by choosing Red
from the Channel pop-up menu. Create
kind of a steep S-curve by clicking three
times along the diagonal curve—once
in the center, once at the next major
grid line above, and once at the next
major grid line below, so they're evenly
spaced along the line. Leave the center
point where it is, and click-and-drag the
top point upward and the bottom point
downward to create the curve you see
here. By the way, I put the original image,
without any RGB curves applied, in the
inset here, just so you can see our origi-
nal starting point.
Step Four:
Then, switch to the Green channel and
make another three-point S-curve, but
one that's not as steep (as seen here at
the bottom). Lastly, go to the Blue chan-
nel. Don't add any points—just drag the
bottom-left point straight upward along
the left edge (as shown here). Normally,
I'd drag the top-right point down along
the right edge, as well, but since this
image has so much white in it, it makes
the walls look yellow. So, in this case, I just
left the top-right point alone. Of course,
based on the particular image you use,
you might have to tweak these settings
(usually it's the amount you drag in the
Blue channel, but again, it depends on the
photo). By the way, if you come up with
a setting you like, don't forget to save it
as a Develop module preset (click the +
[plus sign] button in the right side of the
Presets panel header. When the New
Develop Preset dialog appears, click Check
None, then just turn on the checkbox for
Tone Cur ve).
 
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