UCA. See undercolor addition [1]

UCR. See undercolor removal [1]

Uncompensated Color command [1]

undercolor addition (UCA) [1]

undercolor removal (UCR) [1]

underlining type [1]

Underlying Layer option [1]

Underpainting filter [1] [2]

Undo command [1]

Undo/Redo Status option [1]

undoing changes [1]

Ungroup command [1]

ungrouping clipping groups [1]

Unify Layer Position button [1]

Unify Layer Style button [1]

Unify Layer Visibility button [1]

Unlink All command [1]

Unlink Sets command [1]

unlocking

colors [1]
slices [1]

Unsharp Mask filter [1]

after resampling [1]

unsharp masking [1]

Unsharpen Mask filter [1]

Unshift All Colors command [1]

untagged documents. See tagged documents [1]

Updates command [1]

URLs

assigning to image maps [1]
assigning to slices [1]

Use Accurate Screens option [1] [2]

Use All Layers option [1] [2]

Use Embedded Color Profile command [1]

Use Pixel Doubling preference [1]

Use Printer's Default Screens option [1]

Use Shift Key for Tool Switch [1]

Use Unified Color Table option [1]

Use Video Alpha option [1]

user slices. See slices [1]

USM. See unsharp masking [1]