error in display and write an image file...

 ISC(:,:,1) = ISCR(:,:) .* 255; 
 ISC(:,:,2) = ISCG(:,:) .* 255; 
 ISC(:,:,3) = ISCB(:,:) .* 255; 
 ISC = uint8(ISC);
 figure(1), 
 subplot(2,2,1), imshow(ISCR,[]);
 subplot(2,2,2), imshow(ISCG,[]);
 subplot(2,2,3), imshow(ISCB,[]);
 subplot(2,2,4), imshow(ISC);

I wanted to get a RGB image from ISCR, ISCG and ISCB… When I display the ISCR, ISCG and ISCB channels using figure, imshow(ISCR,[]); but if i give only figure, imshow(ISCR,[]); only full white figure file comes...

I wanted to display the final combined RGB image, i did the above code but I don’t view anything just white figure file… What can be the problem… Please rectify it for me…

[Geoff Hayes]

Elysi - what is the minimum and maximum value for each of ISCR, ISCG, and ISCB? Which of the four subplots show the correct image, or do all of them just show a white image?

Answer 1

[Image Analyst]

That's because ISC and ISCR are double, not uint8 . It expects doubles to be in the range 0-1. If you have values above that, like 200 or 255, it will display them as white. If you use [], then it scales the array to 0-1 and then it will display fine because it's in the expected range.

[Image Analyst]

Attach the original image file so I can try it.

[Image Analyst]

You didn't use [] like I suggested! Try this:

imshow(ISC(:,:,1), []);

Please take special note to see the left and right bracket after the array.

[Image Analyst]

Attach the images here, not on tinypic which is a pain for me to get the images from due to ads and other problems. Use the green and brown frame icon or the paper clip icon.

[Image Analyst]

I'm not sure your use of inv() is correct. To transpose the curve I don't think you'd do a matrix inverse. Get rid of inv and it seems to work fine.

[Elysi Cochin]

sir, it was with the equation... now it is working fine...

[Image Analyst]

But you still have the matrix inverse function inv() in there??? That's weird.

[Elysi Cochin]

no sir it was the inverse of the function... i found the inverse of the function using finverse and applied it to the code... and it worked well...