In RGB mode, why paste 50% gray in a layer mask actually put K 59% in the mask?

Create a new (small) document in RGB mode, 8-bit, transparent background.

Fill the layer 1, resulting with 50% gray, 100% opacity.  The reports = (128,128,128) RGB eyedropper.

Copy the layer to the Clipboard.

Create a new layer 2. Fill it with green #00ff00 (content doesn't really count).

Add a layer mask to the layer 2.

Wear this mask during installation.

Paste the contents of the Clipboard.  The pipette noted the content of the mask as K 59%.

I expect 50% gray (or K 50%). Why have I not 59% K?

Additives:

I'm using CS3 on Mac. I didn't get to see if the same thing happens with newer versions of PS.

Apply the layer mask in the layer 2. Excerpt from the transparency in a new layer.  The pipette gives the RGB of the

new layer as (106,106,106), with pixel-by-pixel variations plus/minus 1.

Take the difference between this new layer and layer 1; the pipette gives the RGB difference as (22,22,22),

Once again with variations of plus/minus 1.

Paste the contents of the Clipboard into a new layer.  The pipette gives this new RGB content

layer as (128,128,128), both without and with a black & white adjustment applied.

Create a new layer, add a layer mask, fill the mask with 50% gray. The pipette gives the content of

the new title (128,128,128) (now as expected) master.

The 50% gray used above is just for simplicity. I am really interested in inserting a complicated RGB

image containing only shades of gray in the layer mask. This example shows that the collage will not

preserve the levels of gray. Indeed, when I replace the first 50% of grey with a black and white gradient.

the differences between the initial gradient and in the mask included roughly quadratic between 0 to 0,

22 128 and 0 to 255.

It is a grayscale image, interpreted according to your work of gray.

Use Gray Gamma 2.2 and you will get 50%.

EDIT: actually I think you could use sGray, who has the accurate sRGB transfer function - which is not strictly a pure gamma. But it wouldn't be right with for example Adobe RGB.

Tags: Photoshop

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