The Hue/Saturation command The Hue/Saturation command lets you adjust the hue, saturation, and brightness of a specific color component in an image or simultaneously adjust all the colors in an image. In Photoshop, this command is especially good for fine-tuning colors in a CMYK image so that they are in the gamut of an output device.
original photo[b]
Then i fine-tune the colours creating a set of 6 in Vivid colours... a good tool for composing pop-art feel
[b]To use the Hue/Saturation command Do one of the following:
Choose Image > Adjustments > Hue/Saturation.
(Photoshop) Choose Layer > New Adjustment Layer > Hue/Saturation. Click OK in the New Layer dialog box. The two color bars in the dialog box represent the colors in their order on the color wheel. The upper color bar shows the color before the adjustment; the lower bar shows how the adjustment affects all of the hues at full saturation.