Check if all pixels are black

Hi people. Does anyone know a clever method for check the weather or not all THE pixels on a layer are black (0,0,0) and 100% opaque ?

I guess as long as the opacity is concerned, the only way is to control-click on the layer, add the selection as an alpha channel and check if all pixels are white. So the same method may be required here, or is there a better ?

Then... How to ensure that all pixels are black (or white)? Histogram catch unique pixel. And the magic wand (tolerance 0) is no help either, because I'm working on very large images (a multiple of my screen resolution) on a regular basis and (besides being tedious) pan/zoom + eye-audit is prone to error and I would need a precise and accurate method.

Any ideas?

Thanks a lot for your help.


(PS: it is a pity that (in CS3) it doesn't seem to be a way to access the Info palette show the total quantity of selected pixels.) In this way, the solution would be two clicks... It's something I need to add to the list of wishes...)

wouldn't be easier to simply fill the layer with black? If you also hold down the SHIFT key, then this does not affect the transparency of the pixels.

Edit: The number of pixels in a selection is displayed in the histogram Panel. For opacity, you can check by using the Quick Mask mode, no need to make a separate alpha channel

Tags: Photoshop

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