How do I go about generating a colormap from a matlab file containing RGB values
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Hi all !
I'm really stuck on a problem I would appreciate help with :
I have a matlab file containing 359 variables where each variable consists of a 360 x 3 matrix of double RGB values . For example , variable 1 looks like this :
1 1 1
1 1 1
1 1 1
1 1 1
1 0.73 1
1 0.76 1
.
.
.
.
.
and so on until row 360 .
My question is how can I go about loading these values into a matrix from which I can generate a colormap?
I have loaded values from a structure into a matrix and represented it as a colormap pretty easily before but my issue here is that I have three RGB values for each row and I don't know how to 'combine' them to get a number which represents a color (if it is even necessary for me to do that).
Many thanks in advance !
Saba
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采纳的回答
Walter Roberson
2016-5-13
cmap = unique(YourArray, 'rows');
or, better,
cmap = uniquetol(YourArray, 1, 'ByRows', true, 'DataScale', 0.004);
cmap is now your colormap.
3 个评论
Walter Roberson
2016-5-16
0.004 is slightly less than 1/255. I was aiming to have a change of less than 1/255 be recognized as being the same color.
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Image Analyst
2016-5-13
Use the colormap() function after you've displayed your grayscale or indexed image
imshow(grayImage);
colormap(variable1); % variable1 is a 360 by 1 colormap matrix.
colorbar; % Show a colored ramp showing what intensities map to what RGB color.
2 个评论
Image Analyst
2016-5-14
You said you have "a 360 x 3 matrix of double RGB values" - well, that is the exact format that a colormap would take. Is the matrix not a colormap? If no, then what is it?
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