RPhoto Help
Menu Edit:

Undo: Undo the last operation

Redo: Redo the last operation

Cut: Copy current selection to clipboard and remove current selection

Copy: Copy current selection to clipboard

Paste: Copy from clipboard and put to picture

Selection: Display the selection as transparent color

Fill Color: Fill image with foreground color

Resize: Resize Image

Rotate: Rotate Image

Crop: Crop image by selection