D
Reset the foreground and background colors
to black and white
ALT+[SCROLL WHEEL]
Zoom in or out of the image
[ OR ]
Resize the brush tip
CMD/CTRL+SHIFT+ALT+E
Create a merged copy of all the layers in the
layer stack
SHIFT+[ OR ]
Cycle backwards or forwards through the
layer blend modes
SPACE BAR
Temporarily switch the current tool to the Hand
tool, for moving around the image while zoomed in
CMD/CTRL+[LAYER MASK]
Load the currently active layer mask as
a new selection
ALT+[EYE ICON]
Switch off the visibility of all other layers in the
layer stack, for before-and-after comparisons
CMD/CTRL+T
Activate the Free Transform tool
CMD/CTRL+I
Invert the color of a layer mask to black
SHIFT+[LAYER MASK]
Disable the effects of a layer mask
CMD/CTRL+J
Duplicate the current layer
X
Switch the foreground and background
color swatches
14 keyboard shortcuts that will massively improve your
speed and efficiency while working in Photoshop
CMD/CTRL+Z
Undo the last change made to the document.
Works multiple times