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Ctrl-Click on the Alpha Channel, and then make sure the layer you want the mask on is highlighted, and go to "Layer-Layer Mask" and then you’ll have options for "hide selection" and "reveal selection."
Of you can click the "New Layer Mask" icon in the layers palette instead of using the "Layer-Layer Mask" menu item.
2.- when i set my image to 100% (keyboard shortcut) CTRL ALT 0 – and set my rulers to centimetres I notice that if I hold up an actual ruler to the screen the two do not correspond. the ruler on the screen shows a larger than actual distance for 1 centimetre. why is this? Is the 100 % image size not actually the size it will print out at ? how does this work?
1. No. For a more detailed answer, you’re going to have to clarify your question.
2. Photoshop thinks that all screens have a resolution of 72ppi. Not many monitors have that resolution anymore, which is why "Actual Size" or "100%" don’t report accurate sizes on screen. Normally, the 100% view will not be the size that prints out.
However, Photoshop will print images that are the width and height (in in/cm) listed in "Image-Image Size." It just won’t display them on screen in an accurate size.
Angus – any image from more or less any source within Photoshop can be pasted in to a layer mask by:
1 – view source image > select (all or variants as described above) > copy
2 – go to destination layer mask thumbnail then ALT + left click on it (this will open the layer mask onscreen) > paste > ALT + left click on the layer mask thumbnail (this will close it)
The beauty about this method is that you may tweak the contents of the layer mask directly just as an image using brushes, eraser, dodge, burn, put the kettle on or even make a cappuccini :).
Some help here: John Slate, "Photoshop and resolution?" #3, 16 Jan 2005 10:38 am </cgi-bin/webx?14/2> in setting up your screen to display the actual size.
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