No difference between font size units 'pixels' and 'points'
显示 更早的评论
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
Epsilon
2024-9-20
Hi Jakob,
I could not reproduce this issue in R2024b. I am getting distinct sizes.
Is there something I am missing ?
Bruno Luong
2024-9-20
编辑：Bruno Luong
2024-9-20
"Pixels.
Starting in R2015b, distances in pixels are independent of your system resolution on Windows and Macintosh systems:
- On Windows systems, a pixel is 1/96th of an inch.
- On Macintosh systems, a pixel is 1/72nd of an inch.
On Linux systems, the size of a pixel is determined by your system resolution."
'points'Points. One point equals 1/72nd of an inch.
So On Windows 1 pixel = 72/96 = 0.75 point (test match on my PC), or 1 point = 1.333 pixel.
The code in the question has font larger on the second figure on my PC as well, as expected.
On Mac pixel = 72/72 = 1 point
Jakob Weis
2024-9-20
Bruno Luong
2024-9-22
Perhaps the New Desktop redefines the pixel unit differently. I don't know New Desktop myself.
Jakob Weis
2025-2-7
采纳的回答
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
szinpt = sz/ptpin
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
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.
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