Error on ind2rgb

Greetings everyone.

[X, MAP] = imread('test.jpg');

RGB = ind2rgb(X,MAP);

LAB = rgb2lab(RGB);

Here I tried to convert from index to RGB image using 'ind2rgb' command, but the result is like this: Index exceeds matrix dimensions.

Error in ind2rgb (line 26) r = zeros(size(a)); r(:) = cm(a,1);

I already tried to looking for the solution on the internet, but I couldn't find it.

Hope someone who knew how to fix it, kindly give me a lead here.

Here I also attached the file that I used for this command.

Thank you before.

[KSSV]

It is because map might be [0 0] or empty matrix.

[Rik]

I don't see an error with you code, but why do you read the image as an indexed image? Why not let imread read you image as an RGB immediately?

[Stephen23]

"Why not let imread read you image as an RGB immediately?"

imread does not convert indexed images to RGB.

[Arygianni Valentino]

Actually I was trying to use the image processing just as mentioned in this page,

https://www.mathworks.com/help/images/ref/adapthisteq.html

But I got stuck on the ind2rgb part, so I ask some help here.

Anyway, thank you very much for your comment.

I wonder, is there any way to improve the sharpness and quality of the color image?

Since I was tried to improve the quality of my picture, but all the available solution I found was for greyscale image. Thank you before.

Answer 1

[KSSV]

Try this:

[RGB, MAP] = imread('test.jpg'); 
[X,map] = rgb2ind(RGB,32) ;
RGB = ind2rgb(X,map);
LAB = rgb2lab(RGB);

[Arygianni Valentino]

Thank you very much, It works!!!

[ASMA BOUDI]

Merci