gray2rgb conversion

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kamarthi vanitha
kamarthi vanitha 2019-7-16
回答： Walter Roberson 2019-7-16
Unable to perform assignment because the size of the left side is 245-by-744 and the size of the right side is 245-by-248-by-3.
Error in untitled>gray2rgb (line 20)
rgb(:,:,1)=Image;
Error in untitled (line 8)
rgb=gray2rgb(I);
  1 个评论
Shashank Sharma
Shashank Sharma 2019-7-16
RGB Images are three channel. Each pixel has it's own R, G, B values.
A grayscale has only one channel.
The gray2rgb function returns a m by n by 3 matrix for an input of m by n image.
If you have predifined the size of rgb it will cause the above error.

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回答（1 个）

Walter Roberson
Walter Roberson 2019-7-16
When you allocated memory for the rgb array, you used something like,
[rows, cols] = size(Image);
rgb = zeros(rows, cols, 3);
This is not correct code when Image is RGB. When you have
[var1, var2, var3, ..., varn] = size(Array)
and Array has more than n dimensions, then the last entry (varn here) will be the product of all remaining dimensions.
[rows, cols] = size(Image);
is not the same as
image_size = size(Image);
rows = image_size(1); cols = image_size(2);
What you should use is
rgb = zeros(size(Image));

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