How can I create dots on a blank image created using zeros?

I want to creat a black image with white circular spots on it, where I can edit the size of the spots.

Answer 1

[Walter Roberson]

https://matlab.fandom.com/wiki/FAQ#How_do_I_create_a_circle.3F

zeros() would create the black image for you. You would then use one of the techniques for creating circles that you would set to 1 (white).

Alternately you could use insertShape from Computer Vision Toolbox.

[Image Analyst]

Or you could call "hold on" and call plot() then call exportgraphics() to save the image with spot on it to disk.