Hi,
I extracted images from a Lytro camera in a TIF format. After that, I tried to open them in Matlab using "imread" and I noticed that the images were MxNx4, not like regular RGB which is MxNx3. I assumed that the images were in RGBA representation since the 4th channel was a constant matrix with the value 65535 in uint16 (255 when I converted to uint8). I then extracted the first 3 channels to get the RGB channels since the alpha channel is a constant 255. But when I used "imshow" and "imwrite", the colors of the image looked off balance compared to the original image presented in "windows photo viewer". I can not compare the difference between the images since I can't present in Matlab the original RGB colors that I saw in the viewer.
Please help and advise.
Thanks,
Ido.
Hello Ido,
I think that your read image has dimensions of M X N X 4 because the color model that you are using is CMYK and not RGB. There is no other problem that comes to my mind that is being caused here. Please try the following code to extract the 3 layers of RGB and then test them further. I hope it solves your problem.
img=imread('C:\example.tif');
img1=rgb2gray(img);
figure(1);
imshow(img)
[m,n]=size(img)
red=[];
green=[];
blue=[];
red=img(:,:,1);
green=img(:,:,2);
blue=img(:,:,3);
a = zeros(size(img, 1), size(img, 2))
just_red = cat(3, red, a, a);
figure();
imshow(just_red);
just_green = cat(3, a, green, a);
figure();
imshow(just_green);
just_blue = cat(3, a, a, blue);
figure();
imshow(just_blue);
Hi,
something that you see in imshow window is not trustworthy. because its show only RGB color space correctly. therefore you can processed your image without regarding imshow. also see 'cmyk2srgb' in MATLAB help
Regards
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