No difference between font size units 'pixels' and 'points'

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Jakob Weis
Jakob Weis 2024-9-20
评论： Jakob Weis 2025-2-7
I noticed when changing the font size of a figure it makes no difference if one chooses pixels or points as units. Is this a known issue or intended?
figure(1)
set(gcf,'Position',[10 10 800 800])
peaks;
fontsize(16,'pixels')
figure(2)
set(gcf,'Position',[10 10 800 800])
peaks;
fontsize(16,'points')
left: figure 1, font size = 16 px; right: figure 2, font size = 16 pt; created using MATLAB Desktop
Interestingly, creating the same figures using the code above in the New Desktop for MATLAB produces 33% bigger font sizes given in points compared to pixels (consistent with the points/pixels size conversion).
left: figure 1, font size = 16 px; right: figure 2, font size = 16 pt; created using New Desktop for MATLAB
  5 个评论
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Bruno Luong
Bruno Luong 2024-9-22
Perhaps the New Desktop redefines the pixel unit differently. I don't know New Desktop myself.
Jakob Weis
Jakob Weis 2025-2-7
Just to clarify, as of R2025a (featuring the New Desktop by default) pixels seem to be redefined. Running on Mac and using the same screen:
get(0,'ScreenPixelsPerInch')
returns 72 in R2024b and 96 in R2025a prerelease.

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采纳的回答

DGM
DGM 2024-9-20
编辑：DGM 2024-9-20
Ran in:
I'm not sure how it's doing the scaling internally, but my guess would start here:
% units per em
sz = 16;
% units per inch
pxpin = get(0,'ScreenPixelsPerInch'); % px/in
ptpin = 72; % pt/in
% inches per em
szinpx = sz/pxpin
szinpx = 0.1600
szinpt = sz/ptpin
szinpt = 0.2222
That would tell us that on this system, the rendered sizes should differ, but measuring the exact height of 1 em is a bit of a chore unless you know what text features are 1 em high. Instead, we can just measure the ratio of character heights.
% expected ratio of on-screen sizes
ptpin/pxpin
ans = 0.7200
On my machine, the calculated ratio seems to be quite close to the size ratio I can measure from screenshots.
If your reported display resolution were 72, then the rendered sizes would be the same. It seems that would be expected on a Mac.
https://www.mathworks.com/help/matlab/creating_guis/dpi-aware-behavior-in-matlab.html

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