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Figure automatically scales by 2

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xiaojuezi
xiaojuezi 2020-4-6
评论： xiaojuezi 2020-4-11
Hi, I set my figure as below:
figure(1)
set(gcf,'units','pixels','position',[0,0,512,512]);
However, the popped figure window has resolution 1024x1024. When I try to get the result as a matrix:
F = getframe (gcf,[0,0,512,512]);
[img, ~] = frame2im (F);
I would like to get img with resolution 512x512x3, but I get its value as 1024x1024x3.
Is there anyway to solve this problem?
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Walter Roberson
Walter Roberson 2020-4-7
https://www.mathworks.com/help/matlab/creating_guis/dpi-aware-behavior-in-matlab.html
For
  • Windows® systems in which the display dots-per-inch (DPI) value is set higher than 96
  • Macintosh systems with Apple Retina displays
When you set the Units property of a graphics or UI object to 'pixels', the size of each pixel is now device-independent on Windows and Macintosh systems:
  • On Windows systems, 1 pixel = 1/96 inch.
  • On Macintosh systems, 1 pixel = 1/72 inch.
(My Mac happens to be one of the last non-Retina models, so I am not affected by this... which also means that I cannot test work-arounds.)
xiaojuezi
xiaojuezi 2020-4-11
Thank you all ! I think it is a problem of macos, when explicitly setting '-r72' or '-r96' for different os, the problem is solved.

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