Levels and Curves adjustments are generally best done prior to conversion to monochrome.

Method 1 - Greyscale

• Image - mode - greyscale

Method 2 - Hue and Saturation

• Use hue/saturation control to desaturate to 100%

Method 3 - Double Hue and Saturation Layers

• Open a file and two hue/saturation adjustment layers .
• Desaturate the second (top) hue/saturation layer to minus 100%.
• Change the first hue/saturation layer to colour mode, and adjust the hue and saturation to give the required tonal balance.

Method 4 - Channel Mixing

• Use the adjust/channel mixing control.
• Tick the monochrome box.
• Adjust the colour channels to change the tones (the total of three channel percentages should usually be 100%).

Method 5 - Lightness Channel

• Open a file - image - mode - lab colour.
• Choose channels - select lightness channel.
• Image - greyscale - discard colour channels.
• Copy background layer - select blend (screen for dark image or multiply for light image) - adjust the opacity to achieve the required tone.

Method 6 - Selective Colour

• Open a file.
• Open new layer - fill with 50% grey - colour blend.
• Select the background layer - open selective colour adjustment layer - adjust the different colours to get right tonal balance.

Method 7 - Selective Colour

• Open a file
• Flatten the image.
• Create a new hue/saturation adjustment layer using saturation mode, hue = -180, saturation = -100 and lightness = +100
• Convert to LAB color and choose the flatten option if it is available.
• Open the channels window and delete channels A and B.
• Convert to greyscale.