Turn your picture from this:

to this:

So in this example, we’ll eliminate all colors except RED.
HERE’S HOW:
1. Open the picture you want to edit.
2. Click LAYER>DUPLICATE LAYER>OK
3. On the LAYERS tab, select BACKGROUND COPY.
4. Click “Create New Fill or Adjustment Layer” as shown in the picture below.

5. Select HUE AND SATURATION

6. On the Adjustments TAB, choose a color that you want to eliminate and set the SATURATION to -100.

So basically, you do that setting for all colors except MASTER and RED.

AND WE’RE DONE :)

(Source: noeeeee)
1. Open the picture you want to edit.
2. Click LAYER —> DUPLICATE LAYER —> Select the BACKGROUND COPY

3. Click the CREATE NEW FILL OR ADJUSTMENT LAYER icon and choose CURVES

3. Let’s adjust BLUE first.

Select it and follow this by dragging the points.

then for GREEN:

then for RED:

4. And we’re done ;)

(Source: noeeeee)
Before:

After:

So, here’s how it’s done:
1. Open the picture you want to edit.
2. Click LAYER —> DUPLICATE LAYER—>OK

3. Select the Background copy then click the “Create new fill or adjustment layer” icon.

4. Select HUE AND SATURATION

5. Check COLORIZE then put these values: HUE=35, SATURATION=40

6. Change the mode to Overlay and the Opacity to 70% and you’re done :)

(Source: noeeeee)
1. Open the picture you want to edit.

2. On the CHANNELS tab, click GREEN

3. Press CTRL+A then CTRL+C (copy)
4. On the CHANNELS tab, select BLUE and then press CTRL+V (paste)

5. Select RGB and then click the LAYERS tab and you’re done :)

6. Save it as JPEG, or PNG or GIF :)
(Source: noeeeee)