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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.
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To vertically flip the image, we need to change the position of pixels. For example, the last row of the matrix will become the first row and the first who will become the last row, and so on. We can use the Matlab built-in function flip() to flip an image or a matrix.
Description. B = rot90( A ) rotates array A counterclockwise by 90 degrees. For multidimensional arrays, rot90 rotates in the plane formed by the first and second dimensions. B = rot90( A , k ) rotates array A counterclockwise by k*90 degrees, where k is an integer.
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.
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An example:
I = imread('onion.png'); I2 = I(:,end:-1:1,:); %# horizontal flip I3 = I(end:-1:1,:,:); %# vertical flip I4 = I(end:-1:1,end:-1:1,:); %# horizontal+vertical flip subplot(2,2,1), imshow(I) subplot(2,2,2), imshow(I2) subplot(2,2,3), imshow(I3) subplot(2,2,4), imshow(I4) 
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