how to convert a true colour image into rgb image
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% code
clc
clear all
close all
w=fspecial('laplacian',0);
f=imread('ee.jpg');
figure
imshow(f)
title('original image');
g1=imfilter(f,w,'replicate');
figure
imshow(g1,[]);
title('unit8 image');
%[f2,revertclass]=tofloat(f);
f2=single(f);
g2=imfilter(f2,w,'replicate');
figure
imshow(g2,[]);
title('double image');
g=f2-g2;
figure
imshow(g);
title('subtracted image');
now i want the o/p image to be converted to its rgb color space.how can i get it i have used the programe like
% code
res=grs2rgb(g);
figure
imshow(cl);
title('coloured image');
but i am getting errors like
% code
Subscript indices must either be real positive
integers or logicals.
Error in ==> grs2rgb at 66 r(:) = map(ci,1);
Error in ==> page77 at 24 res=grs2rgb(g);
so please help in this . the image at the figure3 is present at the https://www.yousendit.com/download/UVJoeFVhZy9PSHhBSXRVag u can see that
0 Comments
Accepted Answer
Image Analyst
on 21 Mar 2013
You're doing a DOG (difference of Gaussians) filter. You convert two images to floating point and subtract them. MATLAB does not display floating point RGB images. There is no need for the grs2rgb() function. You can either cast it (your "g" variable) to uint8 with the uint8() function, or scale it to the 0-1 range with im2double().
6 Comments
Image Analyst
on 1 Apr 2013
It's an RGB image with every color channel being the same. If that's not what you want, then please say exactly what you want to be in the red channel, the green channel, and the blue channel. If they are to be different images in each channel then say what they are, how they are different, where they are supposed to come from, etc. Do you want to do the same filtering on each color channel independently and then combine the results into an RGB image when the filtering is all done?
More Answers (1)
Jan
on 21 Mar 2013
grs2rgb is no Matlab function. I guess you mean FEX: grayscale-to-rgb-converter. Then the author is responsible for such questions, but the documentation should clear this also. It looks like this function expects an image with indexed colors, while you provide another format.
Instead of posting the method to create the inputs, it would be much easier to understand, iof you show us the size and type of the variable g, and if it contains integer or floating point values.
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