Converting to Black and White using Layers and Hue/Saturation

First of all go to the 'Window' drop down menu and make sure 'Layers' is selected.

1. Go to Layers (drop down menu)
- New Adjustment Layer
-Hue/Saturation

Click OK to New Layer window.

2. In the nex window to open up 'Hue/Saturation' reduce Saturation to -100 (far left) and click ok.

3. Click on 'Background' in Layers palette.

4. Go to Layer on drop down menu (again) and
-New Adjustment Layer
- Hue/Saturation
-In 'Mode:' change 'Normal' to 'color' (close to the bottom).

5. In Hue/Saturation window click OK

6. In Layer's window double clikc on the bottom hue/saturation layer's icon.

7. In this window change the 'master' drop down menu first to 'red' and adjust, then to 'green' and adjust then to 'blue' and adjust.
Click ok when you've done.

This will now be a psd file (Photoshop document) which takes up a lot of memory. If you want you can save it like that and then do a duplicate and go to the Layers window and 'merge layers' then save as a jpg. Or simply save as a jpg in the first place but then you won't have an original.