saveas commad saves a figure with different size in MATLAB version 2013b and 2020b

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Sajid Afaque
Sajid Afaque 2022-1-18
编辑： Richard Quist 2022-1-23
Hi,
I recently switched from MATLAB 2013b to 2020b. I have a issue of figure size when saving figures as png.
I’ll try to illustrate my code
% This function automatically access the current Monitor Resolution and
% creates the plot graphs within this resolution
%%
intVecMonitorResolution = get(0,'MonitorPositions');
if intVecMonitorResolution(3) > 450
intScaWidth = intVecMonitorResolution(3)*0.8;
intScaLeftVal =intVecMonitorResolution(3)*0.1;
else
intScaLeftVal = 1;
intScaWidth = intVecMonitorResolution(1,3);
end
if intVecMonitorResolution(4) > 200
intScaHeight = intVecMonitorResolution(4)*0.75;
intScaBottomVal =intVecMonitorResolution(4)*0.1;
else
intScaBottomVal = 1;
intScaHeight = intVecMonitorResolution(1,4);
end
monitor_pos = [intScaLeftVal intScaBottomVal intScaWidth intScaHeight];
%%my monitor_pos
% monitor_pos =
% 1.0e+03 *
% 0.1536 0.0864 1.2288 0.6480
%%Plot something
x = 1:1:5;
y = 1:1:5;
fh=figure('Position',monitor_pos,'Visible','on');
set(0,'DefaultFigureColor','w');
ax=axes('parent',fh,'FontWeight','demi','FontSize',12,'FontName','Times New Roman','LineWidth',2,'TickDir','out');
plot(x,y,'r');
set(ax,'XMinorGrid','on')
set(ax,'YMinorGrid','on')
till here code works same for both versions, but now when i save the figure
saveas(gcf,'fgname','png')
the above saveas command saves the figure with size
  1. 1200 * 900 pixels --> in 2013b
  2. 1920 * 1013 pixels --> in 2020b
the size increases in 2020b, is there a way in which i can save the images of size 1200*900 pixels in 2020b version as well retaining the same quality of image.

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采纳的回答

yanqi liu
yanqi liu 2022-1-19
yes，sir，may be use print or exportfig、getframe+frame2im，such as
print(gcf,'-dpng','-r200','fgname')

更多回答（1 个）

Richard Quist
Richard Quist 2022-1-23
编辑：Richard Quist 2022-1-23
When calling saveas, the size of the exported image is controlled by the figure's PaperPosition property. Prior to R2016a the default for that property was 8x6 inches; that size will result in the saved image being 1200x900 pixels at the default output resolution of 150 DPI.
In order to get that same output size you can set the figure's PaperPosition width and height; assuming your figure PaperUnits property is set to 'inches' you can add this line after you create your figure:
fh.PaperPosition(3:4) = [8 6];
If your figure PaperUnits property is not set to 'inches' just set the PaperPosition to the equivalent of 8x6 inches in whatever those units are.

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