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You’ve obviously put a lot of thought and work into this. Bravo. Do you have an application in mind for this, such as silkscreen printing, or is this an educational exercise?
—
Mike Russell
http://www.curvemeister.com
http://www.zocalo.net/~mgr
http://geigy.2y.net
H.Pol Sixe wrote:
—
Mike Russell
http://www.curvemeister.com
http://www.zocalo.net/~mgr
http://geigy.2y.net
H.Pol Sixe wrote:
PhotoShop LE Colour Separation Workaround:
I have LE but as it is known, there is no colour separation built-in and I haven’t found a plug-in either. I wonder if anyone can comment on the following technique:
Example – red (255,0,0), green (0,255,0) and blue (0,0,255) balls on a white (255,255,255) background.
1- duplicate image, add a new layer to the duplicate. Fill new layer with red (255,0,0) as "darken". Flatten resulting image and save as "redchan" 2- go back to original, create another duplicate with a new layer, fill with green (0,255,) as "darken" and flatten and save as "greenchan" 3- Same for blue (0,0,255) and save as "bluechan". You now have three colour channels (or do you?).
4- Now to restore – take any of the new "*chan" images, duplicate it. On the duplicate, copy the background, set the layer as "difference" with 100% opacity, then delete the original background. You will have a new image with "background copy" layer. Rename it the proper colour. 5- Go to 2nd "*chan" image, select all, copy and paste onto the new "background copy" image as "difference". Rename it the proper colour. 6- Repeat for 3rd "*chan" image. . Rename it the proper colour. You should now have the three channels as three layers as a new image. You should see your RGB original red, green, blue balls. 7- Trying same with a photographic *.jpg, I end up with a 3-layer *.psd that looks right, but is it truly separated? 8- If you take the channels and invert each, then do a "remove white" filter (plug-in), and invert again, you get colour +clear channel. What do you call that?
9- To make a nice greyscale with red-filter effect – duplicate the original and image mode to grayscale. Take the "redchan" image, image mode to grayscale, select all and copy paste onto the grayscale as "overlay". You can adjust the opacity to suit – note at 100% the blues will be black, whites stay white; cyan, red, yellow & green darken a bit. 10- Do the same with a grayscale of "greenchan" and you will find blue and red turn black, green, cyan, yellow lighten. 11- Do the same with a grayscale of "bluechan" and you will find red turns black, blue, yellow, green, cyan darken.
12- Put all three grayscale colour "*chans" onto the base grayscale and you can play around with 4 "channel" opacities.
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