how to match both the side?

Sir, If LHS is 3D image and RHS is 2D then how to match both the side

eg.

outimg(:,:,1)=out1img

 how to convert the RHS(2D-image)  to LHS (3D)
* *outimg* * is rgb image

Answer 1

[Wayne King]

If it's a simple matter of assigning matrices, then your syntax works.

 outimg = zeros(256,256,3);
 out1img = ones(256,256);
 outimg(:,:,1) = out1img;

or

out2img = randn(256,256);
out3img = randn(256,256);
outimg = cat(3,out1img,out2img,out3img);

But if you are trying to convert a grayscale image into RGB, there's more to it than simply copying images into the 3 pages of a new matrix (unless you've done the work already). You may want to look at this answer:

Image Analyst's Convert grayscale to RGB

[Poonam]

I am assigning the 2D image to 3D image and as you said if i am assigning the my syntax is correct but why am I gettion subsription mismatch error

[Image Analyst]

Wayne, since he works for the Mathworks, may have the Crystal Ball Toolbox, but I don't , so you'd need to attach your code for me to see what you're doing wrong.

[Poonam]

inImg = imread('C:\Users\Poonam\Desktop\MATLAB\R2008a\bin\matlabimage\lotus.jpg');
figure;imshow(inImg);title('Input Image');
s_inImg = size(inImg);
outImg = zeros(s_inImg);
ycbcrOutImg = zeros(s_inImg);
%DCT Parameters
blkSize = 8;
ycbcrInImg = rgb2ycbcr(inImg);
y_inImg = ycbcrInImg(:,:,1);
cb_inImg = ycbcrInImg(:,:,2);
cr_inImg = ycbcrInImg(:,:,3);
I_max = max(max(y_inImg));
%Block-wise Splitting
y_blocks = Mat_dec(y_inImg, blkSize);
s = size(y_blocks);
dctBlks = zeros(s);
for i = 1 : s(3)
    for j = 1 : s(4)
        localBlk = y_blocks(:,:,i,j);
        localdctBlk = dct2(localBlk);
          localdctBlk = localdctBlk ./ 8;
          orig_dc = localdctBlk(1,1);
          %Adjustment of Local Background Illumination
          x = localdctBlk(1,1) / double(I_max);
          mapped_dc = x * (2 - x) * double(I_max);
          %Preservation of Local Contrast
          k = mapped_dc / orig_dc;
          localdctBlk(1,1) = k * localdctBlk(1,1);
          dctBlks(:,:,i,j) = localdctBlk;
      end
  end
dctImg = merge_blocks(dctBlks);
dctImg = dctImg .* 8;
*y_outImg = blkproc(dctImg, [8 8], 'idct2(x)');
ycbcrOutImg(:,:,1) = y_outImg;//Error
ycbcrOutImg(:,:,2) = cb_inImg;//error
ycbcrOutImg(:,:,3) = cr_inImg;//error 2D assign to 3D
*  
ycbcrOutImg = uint8(ycbcrOutImg);
rgbOutImg = ycbcr2rgb(ycbcrOutImg);
figure;imshow(rgbOutImg);title('DC Adjustment');

*??? Subscripted assignment dimension mismatch.

Error in ==> colordct at 57

ycbcrOutImg(:,:,1) = y_outImg;* *

This is what i m getting