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Subj: Seamless Checkers 93-05-03 00:15:28 EDT
From: Ben HSC
(responding to the following post in KPT General Ramblings)
>>>...I've been trying to figure out how to seamlessly take 2 pics and tile them
by alternating squares of each picture to form one. I've seen this done
manually, but never on screen without many hours of image manipulation. Any
quick-ideas to meet this objective?? Thanks a bunch!!!...<<<
Using just copying and pasting this would take forever, but after you become
familiar with Photoshop Channel Operations (Chops) it becomes a one-minute
operation. Here is an easy way to do it:
Take your two images A and B (make sure they are the same size). Now make a new
grayscale image exactly twice the size of your intended checkers (if you want
checkers 10 x 10 pixels, make a 20x20 grayscale document) and use PS tools
(select the upper left quadrant, hit option-delete to fill with foreground
color, etc.) to make a black and white checkerboard in the new document. Then
select the entire document (Cmd-A) and go to Edit->Define Pattern. Photoshop
will save the checkerboard into memory as a square tile. Now create a new
grayscale document the same size as A and B, hit Cmd-A (select all), and go to
"Fill..." under the Edit menu. You will get a dialog. Select Normal apply, using
Pattern (not Foreground color). Hit OK. You should now have a large checkerboard
image.
Now go to Image->Calculate->Composite and choose A as foreground, B as
background, and the new checkerboard image as the mask. Make sure that all
channels of the image (RGB) are selected in the Composite dialog. Then hit OK.
Photoshop will create a new document that should be exactly what you are
looking for. All sorts of effects like this can be done quickly and easily in
similar ways.
You should take a look in our Kai's Power Tips library and download tips
#1,2,17,18,and 19 to get some cool ideas in this area. In fact... why not
download them all? They'll teach you a lot more about the real power of
Photoshop than any manual... and they're a lot of fun too. :)
Happy Photoshopping!!
-Ben Weiss, HSC Software