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Setting Measurement Parameters
When using the Analysis tools in Photoshop, you will need to establish the scale of measure. Go under the Analysis menu, choose Set Measurement Scale, and select Custom. You have three settings to modify: Pixel Length, Logical Length, and Logical Units. An example would be if you know your document is 100 pixels wide, you would enter 100 in the Pixel Length field. Then, if you know that 100 pixels equals an inch, you would enter 1 for Logical Length. Then type inches for Logical Units. Now you have set the Measurement Scale to measure every 100 pixels as one inch.
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Create A Composite Layer
If you have a multilayer composition and you
want to apply an effect to all the layers at once, don’t flatten the layers–use a composite layer instead. Hide the layers you want excluded, and press Shift-Command-Option-E (PC: Shift-Ctrl-Alt-E). A new layer will be created at the top containing a merged copy of all the visible layers.
Another option is to create a new layer at the top of the stack and make it active. Command-click (PC: Ctrl-click) each layer you want to include to make those layers active, as well. Press Option-Command-E (PC: Alt-Ctrl-E).
by Colin Smith
