Drawing circles in mm on an image

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Rodi Ak
Rodi Ak on 22 Aug 2018
Commented: Rodi Ak on 22 Aug 2018
Hello community,
I want to draw circles with specific sizes in mm on an image.
So that if I would print out the image, the radius of the circles would appear in the same mm I used for drawing the circles. The picture is 480x720 in size and has 300dpi.
Can someone give me an advise?
Thanks in advance!

Accepted Answer

Arie Lerner
Arie Lerner on 22 Aug 2018
Picture size is irrelevant here. only resolution, if I get your question right. DPI is dots per inches, one inch is 25.4mm, meaning you have density of 300/25.4 = 11.8 dots (or pixels) per mm. So if you want to draw a circle of X mm radius, it should have radius of X*11.8 dots.
  1 Comment
Rodi Ak
Rodi Ak on 22 Aug 2018
Thank you! I was not sure whether dots is the same as pixels, but then it is just basic mathematics.

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