replace RGB values with new values

Question

Elysi Cochin 2022-5-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1726590-replace-rgb-values-with-new-values

编辑： Elysi Cochin 2022-5-25

How to change the pixel values of a RGB image to

% if pixel value is in the following range
0-64  to 0 
65-128 to 1
129-192 to 2
192-255 to 3

How to change in all the channels without using for loop

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Answer 1

Dyuman Joshi 2022-5-25

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1726590-replace-rgb-values-with-new-values#answer_971220

编辑：Dyuman Joshi 2022-5-25

rgb=[67,68,69;0,67,69;0,66,68;125,126,127;122,125,127;117,122,126;113,114,115;110,113,115;106,111,114]
rgb = 9×3
  68    69
  67    69
  66    68
 126   127
 125   127
 122   126
 114   115
 113   115
 111   114
floor(abs(rgb-1)/64)
ans = 9×3
   1     1
   1     1
   1     1
   1     1
   1     1
   1     1
   1     1
   1     1
   1     1

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DGM 2022-5-25

If the input is properly uint8 class, then the output won't be as expected. So long as the input is at least scaled [0 255], the following should work regardless of input class, and the output will be cast properly for the scale.

uint8(floor(abs(double(rgb)-1)/64))

Elysi Cochin 2022-5-25