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0

Here I am trying to multiply the r g b data of this image by a 3x3 matrix.

fil=size(image,1);
col=size(image,2);
N = fil * col;
primaries = reshape(image, N, 3);
primaries = primaries';

% modification

primaries = primaries';
result = reshape(primaries, fil, col, 3);

matlab

share|improve this question

asked Mar 8 at 23:33

Brett HarrisonBrett Harrison

83

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, you could add the transpose into the reshape line, if that helps any. Anything beyond that depends on what you're doing in % modification.
  
  – beaker
  Mar 8 at 23:51
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you beaker. I'm multiplying the r g b data by a 3x3 color matrix transform to change the gamut of the image. I would have thought there's a simpler way to do that by taking the image file in it's normal form of x by y by color format and multiplying it by the 3x3 matrix using indexing like [1 0 0; 0 1 0; 0 0 1] * image(:,:,1);. Forgive my novice question!
  
  – Brett Harrison
  Mar 9 at 0:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Your approach looks fine to me. Maybe somebody else will have a better idea.
  
  – beaker
  Mar 9 at 0:05
  

  
  
  
  

add a comment | 

0

Here I am trying to multiply the r g b data of this image by a 3x3 matrix.

fil=size(image,1);
col=size(image,2);
N = fil * col;
primaries = reshape(image, N, 3);
primaries = primaries';

% modification

primaries = primaries';
result = reshape(primaries, fil, col, 3);

matlab

share|improve this question

asked Mar 8 at 23:33

Brett HarrisonBrett Harrison

83

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well, you could add the transpose into the reshape line, if that helps any. Anything beyond that depends on what you're doing in % modification.
  
  – beaker
  Mar 8 at 23:51
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you beaker. I'm multiplying the r g b data by a 3x3 color matrix transform to change the gamut of the image. I would have thought there's a simpler way to do that by taking the image file in it's normal form of x by y by color format and multiplying it by the 3x3 matrix using indexing like [1 0 0; 0 1 0; 0 0 1] * image(:,:,1);. Forgive my novice question!
  
  – Brett Harrison
  Mar 9 at 0:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Your approach looks fine to me. Maybe somebody else will have a better idea.
  
  – beaker
  Mar 9 at 0:05
  

  
  
  
  

add a comment | 

Here I am trying to multiply the r g b data of this image by a 3x3 matrix.

fil=size(image,1);
col=size(image,2);
N = fil * col;
primaries = reshape(image, N, 3);
primaries = primaries';

% modification

primaries = primaries';
result = reshape(primaries, fil, col, 3);

matlab

share|improve this question

asked Mar 8 at 23:33

Brett HarrisonBrett Harrison

83

fil=size(image,1);
col=size(image,2);
N = fil * col;
primaries = reshape(image, N, 3);
primaries = primaries';

% modification

primaries = primaries';
result = reshape(primaries, fil, col, 3);

share|improve this question

asked Mar 8 at 23:33

Brett HarrisonBrett Harrison

83

share|improve this question

asked Mar 8 at 23:33

Brett HarrisonBrett Harrison

83

asked Mar 8 at 23:33

Brett HarrisonBrett Harrison

83

asked Mar 8 at 23:33

Brett HarrisonBrett Harrison

83