Exporting images (png) through export_fig - painfully slow

I'm using export_fig to export a figure to a high resolution png and it's painfully slow. Takes about 36 seconds to perform the export. I also see the following warning upon export:

Warning: print2array generating a 83.6M pixel image. This could be slow and might also cause memory problems

Any suggestions on alternatives to speed up this portion of my code?

export_fig('-dpng','-opengl','-r450',sprintf('C:\\Users\\Username\\Documents\\%s',datetimelabel));

[darova]

Can't you reduce resolution?

Answer 1

[Yair Altman]

Try to either reduce the resolution (the -r450 part), or to save as a vector-graphics image (PDF/EPS) rather than a PNG bitmap.

Answer 2

[Image Analyst]

Try comparing it to exportgraphics() but you'd need r2020a or later.

Answer 3

[Oliver Woodford]

Reducing the level of anti-aliasing will reduce the sixe of the images created, saving time. Use the '-aX' option, where X is 1 to 4 (faster to slower).

Answer 4

[yanqi liu]

yes，sir，may be use getframe or print，such as

f=getframe(gcf);

f=frame2im(f);

imwrite(f, './result.tif');

or

print(gcf,'-dpng','-r200','result')