How can I save high resolution image with original size and quality?
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Ferit Akgul
il 18 Feb 2018
Modificato: Ferit Akgul
il 19 Feb 2018
Hi,
I'm trying to save a high resolution image (trial.png) that I load into a figure and edit (modify some pixels).
The code is:
hread=imread([fname]);
[height,width,dim]=size(hread);
res = get(0,'screenpixelsperinch');
% for keeping original image size
set(gcf, 'PaperUnits', 'inches', 'PaperPosition', [0 0 width height]/res);
% for margin removal
horg = get(gca,'position')
set(gca,'position',[0 0 1 1],'units','normalized')
dirname = dir;
filename = fn;
print(gcf,'-dpng', '-noui',fullfile(dir,fn),['-r' num2str(res)])
When I save the image either using print or export_fig (export_fig_out.png), image resolution comes out the same however image looks very pixelated.
How do I make sure image is saved with the properties of the native image?
Thanks
2 Commenti
Rik
il 19 Feb 2018
Saving through a figure can be very tricky. Often the easiest solution is to not use the figure, but modify the image itself (as loaded into a matrix). It is then trivial to write out the modified image with the same resolution: it's the default for imwrite.
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Image Analyst
il 19 Feb 2018
Like Rik says, use imwrite() to save the original image rather than a .fig. You can always call imread() and put it into a new figure/axes if you want. I don't see how importing a pre-drawn figure would make it easier for you to do your edits in your GUI rather than reading an image directly into the axes control on your GUI window.
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