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Proper curves adjustment
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jrampton on 23 February, 2008 03:19:00
 
Ok first off open your image.
Create a new layer
Edit>Fill
Select 50% Gray
Set this layers blending mode to Difference
click on Create new fill or adjustment layer (half black half white circle at
the bottom of the layers pallette)
Select Threshold and move the slider to the left, the last bit of black is your
midtone select OK
Right click on your eyedropper tool and select colour sampler tool
click on your black bit which is your midtone
once this is marked you can delete the 50% grey layer and your adjustment.
create another theshold adjustment and move it all the way to the left and
right marking you blacks and whites with the colour sampler tool.
Now create a curves adjustment layer, select the black eye dropper and click on
the black, select the white and click on the white now click on the grey and
when you select the grey you might find that your colours change quite a bit.