MATLAB: How to save high resolution image with original size and quality

dpngimageImage Processing Toolboximshowlarge imagepaperpositionpaperunitsprintresolutionsaveasscreenpixelsperinch

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

Best Answer

Hello,
I believe I found a way. Based on Rik's and Image Analyst's answers I had to rewrite some portion of my code to use the following commands to get the job done directly on the image matrix:
-InsertMarker
-InsertShape
-InsertText
Thanks!
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