cant add matrices of same dimensions

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Terry McGinnis
Terry McGinnis 2015-10-12
评论： Terry McGinnis 2015-10-12
im trying to add an image to a matrix of ones for which i have used the following code:
c=imread('C:\Users\Richik\Desktop\ima.png');
[x,y]=size(c)
m=ones(x,y);
g=m+c;
but even when the matrix dimensions are same,im getting this error:
??? Error using ==> plus
Matrix dimensions must agree.
i cant figure out why this is happening.....

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采纳的回答

Walter Roberson
Walter Roberson 2015-10-12
Chances are that your PNG image is an RGB image and so is 3 dimensional. You should look at
s = size(c)
[x,y] = size(c)
and I think you will find that y is not equal to s(2). Read the documentation for size() to understand why not.
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Walter Roberson
Walter Roberson 2015-10-12
A change of 1/256 in the brightness of an image is not necessarily going to be very noticeable, especially if you have not used a full 256 entry colormap
colormap(gray(256))

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更多回答（1 个）

Eng. Fredius Magige
Eng. Fredius Magige 2015-10-12
Hi It has to follow its rule, and might be g=[m,c];
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Walter Roberson
Walter Roberson 2015-10-12
That would, if it worked, append c after m, not add 1 to each element of c.

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