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i want to alter dpi

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nayana
nayana 2013-2-25
how can i alter dpi of an image and set it to 300.

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Sean de Wolski
Sean de Wolski 2013-2-25
In print? Specify the rnumber
print(gcf,'-r300')
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nayana
nayana 2013-2-25
not in print i have to save it on my disk. the dpi property of the image should be adjusted to 300 and it should be saved
Sean de Wolski
Sean de Wolski 2013-2-25
Yes. You save a figure as an image with the print command:
figure;
surf(peaks);
print(gcf,'-r300','-dpng','test.png')
And for more info:
doc print

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更多回答（1 个）

Walter Roberson
Walter Roberson 2013-2-25
dpi is not an physical property of images, and cannot be set by imwrite() or print(). In some kinds of images, dpi can be set in auxillary information headers, such as EXIF headers. Unfortunately MATLAB does not have any routines that can write those headers. See http://www.mathworks.com/matlabcentral/newsreader/view_thread/298784

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