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Changing a color photo to print in black and one additional color only

StevenMiles
StevenMiles asked
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Last Modified: 2014-01-16
Hi,
I have some color photographs that I'd like to print using only two colors: black, and some shade of red. For example, here's a full-color image:
http://www.app25.com/Original_image.jpg

I've used Photoshop extensively, but only for certain tasks, and this is beyond what I've been able to figure out.

Is there a straightforward way to select a red color out of this image, and produce a new image that has only:
a black layer (or channel, or whatever, I'm out of my league) and
a red layer,
and see what the printed image would look like?

Thanks in advance for any suggestions.
--Steve D.
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Commented:
Hi, Cathal,

Thanks. I guess I should have stated what I've tried so far, because it's similar to what you said.  I took the original image. I used "Select... Color Range ..." and selected a bunch of the red, with high fuzziness. I copied that selected-red and saved it onto a new image. Then I changed the mode to greyscale on the original image to dump out the color, changed it back to RGB color so I could add color again, and pasted the red-only-image back in.

Here's what I came up with (the before on top, the "two-color" version on bottom):
http://app25.com/pictures.html

It looks pretty good, but there may be lots of different reds in there, and the printer might say it's still a "four-color" image.

Did I explain things better this time?
--SD
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So you are basically wanting to get rid of all shading of the colors so it is just one solid color - red and black and the whites/grays

Author

Commented:
I think so. So that using only black and all the greys, and some shade of red (to be determined) and all the different percentages of that shade of red, I get as close as I can to the original image, but the printer only needs two ink colors: black, and the one shade of red that I specify, based on my analysis of the photo.
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Commented:
So something like this
image
Here I have just set Tolerance to 100, no anti alias or continguous, fill method Color and paintbucket the red on the new layer
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