palette

Adobe Photoshop– How to change ruler units.

There are at least two ways to switch between the various measurement units
that Photoshop displays.

One is to change them in your Preferences by going to the Photoshop menu under
Preferences and choosing Units & Rulers (in Photoshop 7 under Mac OS 9,
Preferences is found under the Edit menu). From here you can change the ruler
units and click OK.

The second way is to open the Info Palette (go to the Window menu and choose
Info) and click on the small triangle next to the cross in the lower left quadrant.
This will bring up a menu that will allow you to change units on the fly.

psunits Adobe Photoshop   How to change ruler units.

Photoshop Quick Tip 5– How to lock the transparency of a layer.

Locking the transparency of a layer will prevent changes being made to the
level of opacity and restrict editing to just the content of opaque and semi-opaque
areas.

Open the Layers palette from the Window menu. Select the layer whose transparent
pixels you wish to lock and then click the Transparency button beside the word
“Lock”. This can also be toggled on and off by hitting the “/”
key while a layer is selected.

trans Photoshop Quick Tip 5   How to lock the transparency of a layer.

Adobe Photoshop– How to lock the transparency of a layer.

Locking the transparency of a layer will prevent changes being made to the
level of opacity and restrict editing to just the content of opaque and semi-opaque
areas.

Open the Layers palette from the Window menu. Select the layer whose transparent
pixels you wish to lock and then click the Transparency button beside the word
"Lock". This can also be toggled on and off by hitting the "/"
key while a layer is selected.

trans Adobe Photoshop   How to lock the transparency of a layer.