Why are the curves "reversed" after the conversion to grayscale ACR?

I have the version of Photoshop CS5 12.0.1.  If I do a conversion to grayscale in Adobe Camera Raw, and then open the image in Photoshop and add a curves adjustment layer, the curve is the 'bad' round sense with the white dot on the left of the curves graph, while the black point is located on the right. However if I add a levels adjustment layer, the graph of levels is as it is usually the black dot to the left and the white point right there.

If I open the image in ACR in color without making a conversion to grayscale, the curves layer is also as expected - black point to white point and left to right.  Can someone explain why it is reversed after a grayscale conversion in ACR?

Thank you

bwcurves.jpg

It's a good question; the default value for grayscale images seems to be Pigment/Ink% instead of light, leading to the "recovery" you describe.

The good news is that the default is separate for color images and black and white, and sticky, so you can change it around this way:

1. click on the button menu bit in the upper right of the Panel and choose the curve Display Options.

2. change the view the amount of: setting of Pigment Ink % to light (0-255).

I hope this helps.

-Christmas

Tags: Photoshop

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