Question

How do I flip a color image (RGB) in MATLAB?
The fliplr does not seem to work without losing the color contents, as it only deals with 2D.

As well, the imrotate may not rotate color images.

Answer 1

The function flipdim will work for N-D matrices, whereas the functions flipud and fliplr only work for 2-D matrices:

img = imread('peppers.png');     %# Load a sample image
imgMirror = flipdim(img,2);      %# Flips the columns, making a mirror image
imgUpsideDown = flipdim(img,1);  %# Flips the rows, making an upside-down image

NOTE: In more recent versions of MATLAB (R2013b and newer), the function flip is now recommended instead of flipdim.