change color intensity of rectangles made using matrix

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Anvinder Singh 2016-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/271381-change-color-intensity-of-rectangles-made-using-matrix

评论： KSSV 2016-3-4

Hi, Can anybody help me understand the concept of color intensity in the following : I have 2 rectangles of black color. I want to give an intensity of 100 to one of them and 300 to the other one. BUt i want them to remain in the grayscale (they should not be colored but should remain between white and black). Is there a scale which matlab uses for such thing ? Is 256 taken as black or some other value ? I am quiet confused.

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Answer 1

KSSV 2016-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/271381-change-color-intensity-of-rectangles-made-using-matrix#answer_212229

在 MATLAB Online 中打开

Get the color coding from the link: http://www.rapidtables.com/web/color/RGB_Color.htm

% first rectangle 
x1 = [0 1/2 1/2 0 0];
y1 = [0 0 1 1 0] ;
% Second rectangle 
x2 = [1/2 1 1 1/2 1/2] ;
y2 = [0 0 1 1 0] ;
% fill colors 
fill(x1,y1,[51,51,0]/256)
hold on
fill(x2,y2,[0,51,0]/256)

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Anvinder Singh 2016-3-4

Thanks Dr. Siva. Does % first rectangle x1 = [0 1/2 1/2 0 0]; y1 = [0 0 1 1 0] ;" refer to the location of the rectangle coordinates ? Also, in fill(x1,y1,[51,51,0]/256) what does 51 refer to ?(red and green intensity, blue intensity is zero ?)

KSSV 2016-3-4

Hey Anvinder

Yes (x1,y1) refer to the locations of the rectangle. [51,51,0]/256 stand for respective [R,G,B] values. You may check the link for other color variations.

Ps: If you find it useful, don't forget to accept the answer.

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