Hard Mix
Gives a result similar to pin light and setting contrast to its maximum. The result is very harsh colouring in large patches.
Difference
Very useful for creating dramatic effects – it reverses tones and colours together, with the brightness of the result depending on the difference between corresponding pixels. Thus, two identical images will result in pure black, however white on black will result in pure white.
Exclusion
A softer version of Difference; gives less contrast, whites in the blend image will invert on the lower layer – and similarly, blacks will do nothing.
Hue
Here, the top layer’s colours are combined with the lower layer’s saturation and brightness. This gives a strong tone effect, but can be weak if the images are not suited for the mode. A possible altnative mode would be Colour.
Saturation
With this mode, the saturation levels of the lower layer are changed to that of their corresponding pixels above. Useful to make an object take up the colour or pattern of another.
Colour
Only the brightness of the lower layer is used, as both colour and saturation from the upper layer are transposed onto it. If the effect is not quite as desired, try Hue instead.
Luminosity
The third possible combination of these last 3; Only luminosity of the top layer is kept, colour and saturation come from the lower image. If not suitable, try one of the other replacement modes above to find your desired result.
Right… I think thats them all covered! 
mg: If you would like further information or help understanding aspects of this topic, please post in the Tutorial Talk Forum.
Thanks
~Cof~
About the author:
I live in Northern Ireland, currently still in school studying to do Sonic Arts at university. Enjoy photography (Nikon D70) and Photoshop (Cs), aswell as playing bass in jazz bands and singing choral/classical works.
Check out my Profile/Gallery for more tutorials and to see my work.
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