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Stretch the dynamic range of the given 8-bit grayscale image using MATL...

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Why am I getting an error when I use grayscale images with

 Why am I getting an error when I use grayscale images with "makehdr"in Image Processing Toolbox 8.1 (R2012b)?

I am receiving the following error when trying to use the "makehdr" utility.
 
low dynamic images must be RGB
 
I suspect the reason is that my images are black-and-white. Is there any workaround for this issue?



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"makehdr" works only on RGB images. The workaround for this issue is to convert the grayscale image to an RGB image.
 
Grayscale images are 2D (m x n) matrices, while RGB images are 3D (m x n x 3) matrices. Therefore one must expand the 2D matrix to fill the 3D matrix. This can be accomplished a couple ways
 
1. Use REPMAT to replicate the 2D matrix 3 times.
 
% Step 1 - Load grayscale image
imGray = imread('grayscaleImage.tif');

% Step 2 - Replicate image into RGB layers using REPMAT
nRV = 1; % Number Of Replications Vertically
nRH = 1; % Number Of Replications Horizontally
nRL = 3; % Number Of Replication Layers
imRGB  = repmat(imGray,[nRV, nRH, nRL]); % Replicate grayscale image 3 times

% Step 3 - Write resized image to file
imageName = 'rgbImage.tif';
imwrite(imRGB,imageName)

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