Matlab gamma correction when opening and writing files -


I am using matlab to do some calculation on images, and my first impression was that after reading one The value stored in matlab matrix was a gamma right from a JPEG file, so, I should write the following code: 

  im = (double (('Myim. jpg'))) / 255) ^ 2.2;   
 To obtain a matrix with values ​​in linear space. However, I tried the following: Generate a linear shield:  
  X = 1: 256 shield (:, x) = ones (128,1) * (x-1) / 255 for; End   
 Then I write it in jpeg file and read it again:  
  imwrite (gradient, 'gradient.jpg', 'quality' , 100); gradient_jpg = double (imed ('gradient.jpg')) / 255;   
 Now I expect the gradient and gradient_jpeg to be isolated, because as it was written as a JPG file and the second was not there, the latter gamma was correct. Both matrix exits I and I am the place where I do not understand. In the last test, I tried to open the same JPG image from Matlab and HDRops. Both images are shown on the same screen, but when I look at the values ​​in the images, they are not the value of values ​​in matlab I get in the HDR on the power of 2.2 (roughly). So my question is ... when a JPEG file reads, or I have,  
 thanks in advance   
 
 
 This is a good question. I'm here for the same reason.  
 In the document to write, I do not see any option for gamma correction, and it is silent on the whole issue.  
 I get the same value in the matrix, which I read from the screen (using imshow using a color checker utility) and on the screen I see, they are very close (but not at all) What do I see in the app to see other images.  
 So I'm not sure S is an answer, but there is more information in it.

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