I'm trying to draw a circle with a red annulus and green center using RGB in MATLAB R2014b. However, since I'm currently drawing the red circle first, then layering the smaller green circle over it, the green turns to yellow. How do I either prevent the colors from adding (so the green shows as green) or draw the red annulus only (instead of the full circle)?
xpix = 1140;ypix = 912;rad = 150;RGB(1:xpix,1:ypix,1:3)=0;[x y] = find(RGB==0);xc = ceil(xpix/2);yc = ceil(ypix/2);for i=1:20 radius = (rad-20*i).^2; r = find(((x-xc).^2+(y-yc).^2) <=radius); for j=1:size(r,1) if(mod(i,2)==0) RGB(x(r(j)),y(r(j)),1)=255; % 1=red
elseif (mod(i,10)==1) RGB(x(r(j)),y(r(j)),2)=255; % 2=green
end end endimshow(RGB);imwrite(RGB,'filter_1.jpg','BitDepth',8);
This is what I currently have:
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