Extract color of image

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PK
PK 2016-10-11
移动：DGM 2023-2-12
I want to extract red part and green part of attached image. I want to extract Red part is to one image and green part is to next image. Please help me.

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回答（3 个）

Walter Roberson
Walter Roberson 2016-10-11
IM = imread('red_rose.jpeg');
R_only = IM;
R_only(:,:,[2 3]) = 0;
imshow(R_only);
pause;
G_only = IM;
G_only(:,:,[1 3]) = 0;
imshow(G_only);
  2 个评论
PK
PK 2016-10-11
Thanks for your answers. I want to extract only green leaves photo and only red flower photo.
Walter Roberson
Walter Roberson 2016-10-11
Search the Answers forum for the word "leaf"

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SREERAG k
SREERAG k 2017-11-21
how can i identify a picture uploaded is a leaf or not
  6 个评论
显示 4更早的评论
Guillaume
Guillaume 2017-11-24
移动：DGM 2023-2-12
@Sreerag k,
The boxes you're using to ask your questions are clearly marked Answer this question. You're not answering a question, so please stop spamming other people questions with your own and start your own question.
Walter Roberson
Walter Roberson 2017-11-24
移动：DGM 2023-2-12
Please stop posting your responses as new Answers. Instead, click on one of the "Comment on this Answer" links to add the information there.
You have to define what it means for a color to be "green". See https://blog.xkcd.com/2010/05/03/color-survey-results/ for partial information on differences in how some people define green.
When I say you have to define what it means for a color to be green, I mean that you need to give us rules that allow us to test any given RGB pixel and determine Yes, or No, "Does this color count as green?". It has to be able to make firm decisions. For example, does RGB [0, 1/255, 0] count as "green", or does it count as "black" ? Does [242/255, 255/255, 242/255] count as "green" but [252/255, 255/255, 252/255] counts as "grey" ? If the green channel is full intensity, then exactly what is the maximum that the R and B channels can be set to and still have the color count as "green"? We need hard rules with all of the boundary conditions described, not just the word "green".

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Yushuo
Yushuo 2022-6-28
编辑：Yushuo 2022-6-28
I use the attached code to extract red color (it use LAB color, you can change the LAB value of the color you want in LMean aMean bMean) and you can change the tolerance as well. Parts code from https://se.mathworks.com/matlabcentral/fileexchange/31118-color-segmentation-by-delta-e-color-difference

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