Can I plot a dot at a specified pixel location?

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zy
zy 2014-7-5
评论： Image Analyst 2017-10-6
I have a set of pixel locations, and I need to draw a dot at each of these know pixel locations. For example, I need to draw a dot in the figure at a point with pixel location (640,400), and then draw a dot at another point with pixel location (640,600).
The screen pixel size is 640x640.
Thank you.

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Image Analyst
Image Analyst 2014-7-5
if ndims(yourImage == 1)
% Grayscale image.
yourImage(row, column) = 255;
else
% Color image
yourImage(rows, column, :) = 255; % or [255,255,255] if that doesn't work.
end
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Safwan Ibrahim
Safwan Ibrahim 2017-10-5
"or set a range of pixels, like a rectangle, instead of just one small pixel." Can you please tell us how can you do that ?
Image Analyst
Image Analyst 2017-10-6
Like this
yourImage(row1:row2, column1:column2, :) = 255; % or [255,255,255] if that doesn't work.

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