Original image:
http://www.retouchpro.com/forums/att...=&postid=34490
A frequent question I see is something like, "How do I take a color image, convert it to black and white and selectively restore color to it?"
There are a couple ways to achieve this. This is one. While I'm at it I'll throw in a bonus "how to."
For those who prefer to cut to the chase and let an action do the layer setup dirtywork, scroll down a couple posts.
1. Starting out with a color image, duplicate the Background. For the purposes of this discussion name the new layer "A. BW"
2. Convert layer A to grayscale. There are many ways to do this, two of which follow. Choose the one you prefer:
. - Image > Adjustments > Desaturate
. - Image > Adjustments > Channel Mixer (click the Monochrome checkbox "on" and adjust the sliders to suit. Rule of thumb: The sum of the "numbers" corresponding to the R, G and B channels should add up to around 100 or so. Try 50 Red, 50 Green for starters.
Alternative: Sketch > Waterpaper
3. Layer A: Duplicate (Name it "B. Photocopy")
4. Click the D key. This will restore the default colors (foreground, black; background, white).
5. B: Apply Sketch > Photocopy. Your call on the settings. Shoot for a reasonable amount of detail with not too many areas of blackness.
6. Layer > New Adjustment Layer > Levels. Chose "Group with Previous" and name the layer, "B1 - Contrast for Photocopy." Take the default settings for now. (Note: If you prefer to use Curves instead, that's perfectly okay.)
7. Layer > New Layer. Name it "C. Restore color from History."
8. Layer > New Adjustment Layer > Hue/Saturation. Chose "Group with Previous" and name the layer, "C1 - Color adjustments." Take the default settings for now.
9. Click on layer A.
10. Layer > New Adjustment Layer > Levels (r, again, Curves). Chose "Group with Previous" and name the layer, "A1 - Contrast for BW." Take the default settings for now.
10. Select the History Brush tool from the Tools Palette.
11. Select a Scatter or Chalk-type brush frim the Brushes Palette. Start with Opacity and Flow at about 50%. Airbrush = on.
12. Click on layer C.
13. Start painting to restore color to desired areas of the image.
Note: This is NOT a layer mask situation where switching back and forth between black and white is the way to hide/reveal color. You'll need to switch between the History Brush to apply color and the Eraser tool to zap it.
14. Once you get the colors applied in the places desired, you can fine tune (or radically change) the colors via the C1 adjustment layer.
15. Adjust layer B1 if necessary.
"But wait," you say. "I didn't want this colored sketch thing. I wanted the color on a real BW image."
Okay...
15. Click off layer B. B1 will turn off too since it was grouped with B.
16. Make contrast adjustments as needed with layer A1.
17. Layers C, C1: Fine tune the selective color applied and the color characteristics via C1.
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Attached: The "color sketch" version.
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Now, it's your turn.

~DannyR~