pnmflip

Flip and rotate PNM images

Flip horizontally

$ pnmflip -lr [input.pnm] > [output.pnm]

Flip vertically

$ pnmflip -tb [input.pnm] > [output.pnm]

Rotate 90 clockwise

$ pnmflip -cw [input.pnm] > [output.pnm]

Rotate 90 counter-clockwise

$ pnmflip -ccw [input.pnm] > [output.pnm]

Rotate 180

$ pnmflip -r180 [input.pnm] > [output.pnm]

pnmflip [options] [file]

pnmflip flips and rotates PNM images. Part of Netpbm toolkit for image manipulation. Supports all basic geometric transformations.

-lr

Flip left-right.

-tb

Flip top-bottom.

-cw

Rotate 90 degrees clockwise.

-ccw

Rotate 90 degrees counter-clockwise.

-r180

Rotate 180 degrees.

-transpose

Transpose rows and columns.