save an image in a specific resolution with saveas

Hello there,

iam trying to safe an figure with saveas(figurename, 'filename','png'), but saving reduces the resolution from 7000x5000 to 1688x1176, and i want to keep the resolution of 7000x5000.

I don't know if I'm too stupid or if it's too obvious...it would be great if someone could help me.

Answer 1

[Image Analyst]

Don't use saveas() unless you want a screenshot. Even if you do you want a screenshot, should use exportgraphics.

If you want to save the actual image (instead of a figure window rendering of it on your screen) then use imwrite.

[Robin Hoja]

I tried that allready:

[seg_bin, seg_rgb] = createMask(I);

h = figure;

imwrite(h,'test.png')

There is stil an error:

Instead its type was matlab.ui.Figure.

[Image Analyst]

You're saving the figure handle. That's just as bad. I didn't say to save the figure (screenshot display). I told you to save the actual image variable that gets displayed. You need to save the image variable with imwrite. On the line above

seg_bin, seg_rgb] = createMask(I); 

you have 3 images seg_bin, seg_rgb, and I. Which of those images do you want to save to the drive?

imwrite(seg_bin, 'Mask Image.png'); % The binary image
imwrite(seg_rgb, 'Masked RGB image.png'); % The original image blackened outside of the mask.
imwrite(I, 'Original image.png'); % The image that was thresholded, presumably the original image.

[Robin Hoja]

Thank you, that worked.