Here is a quick run down on how to use the Hue/Saturation tool in Photoshop to create a B/W image. Once your image is open go to Layer> New Adjustment Layer> Hue/Saturation. You will get a pop up window that looks like this.
Drag the slider under Saturation all the way to the left and hit ok. (Make sure the Colorize box is not checked, if it is your image won't be B/W. It will be Sepia or some other duo-tone.) There, you have just created a B/W image.
Next I will go through the steps for making a B/W image using Calculations. Open the image you want to use in Photoshop. Choose Image> Calculations from the menu at the top of the program.
You will get a pop up window like this one below.
Now you can take turns changing the colors in the Channel drop down menus in Source 1 and Source 2 until your image begins to look how you want it to. Try several combinations such as Red in Source 1 and Blue in Source 2 or Green in Source 1 and Red in Source 2. There isn't a wrong or right combination. You can also in the drop down menu next to Blending choose from numerous options and then play with the Opacity. You should choose New Document next to Result to have the new B/W image opened as a separate document from the color one with which you started.
Note: After creating a New Document you will want to go to Image> Mode and change it from Multichannel to Grayscale. If you don't do this it won't give you the option to save it as a JPG or TIFF file. You also won't be able to add any Adjustment Layers until after you have changed Modes. Here are two examples of B/W images I made using both the Hue/Saturation tool and using Calculations.
Hue/Saturation
Calculations
Hue/Saturation
Calculations
Play around with your photos and it won't take long for you to decide which tool you prefer for making B/W images. There is no right or wrong answer to this one. It's all photographers preference.
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