Generating a mask from scratch

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Salad Box
Salad Box 2022-10-3
评论： Salad Box 2022-10-4
Hi
I would like to generate a simple mask image from scratch in Matlab if it is possible.
It has the following criteria:
  1. the size of the image needs to be 500 x 500 pixels.
  2. the center of the mask image needs to be a number, say 8. This area is white [255 255 255].
  3. the size of the number is best to be adjustable by fontsize?.
  4. the rest of the areas in the mask image needs to be black [0 0 0].
See the sample image below which is NOT done in Matlab. Is this achievable in Matlab?

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Image Analyst
Image Analyst 2022-10-3
编辑：Image Analyst 2022-10-3
It's a trivial modification of the code in the FAQ that draws a ring. Just make two rings with different centers and radii.
https://matlab.fandom.com/wiki/FAQ#How_do_I_create_a_ring?
You could also use insertText if you have the Computer Vision Toolbox.
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Image Analyst
Image Analyst 2022-10-4
Thanks. You can use imbinarize to force it to have no "noise" or gray levels, which are probably used to anti-alias (smooth) the character. Also, if you save the image(s) make sure you use the PNG extension, for lossless compression, rather than JPG which will change and add gray levels due to it being lossy compression.
Salad Box
Salad Box 2022-10-4
Thank you very much for your advices. I will try the imbinarize.

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