MATLAB: How to save the image in the original resolution

MATLABsaveas

I load an image in MATLAB using "imread" and then plot some additional curves on top of it. Now, using the "saveas" function to save the plot changes the image dimensions (compared to the image I had initially opened). How do I save the image in the original resolution?

Best Answer

Please try the following workaround to see if it resolves the issue:

1. Download the "export_fig" function from the File Exchange. Here is the link:

https://www.mathworks.com/matlabcentral/fileexchange/23629-export-fig

2. Extract the compressed folder and add it to the MATLAB path.

3. After you are done plotting, instead of using "saveas", please use the following command (where "test.png" is the name of the output image):

export_fig test.png -native

For more information, please refer to the following page:

https://github.com/altmany/export_fig/blob/master/README.md

Related Solutions

MATLAB: Is the PNG of the figure rotated 90 degrees

When the 'PaperOrientation' property of the figure is set to 'landscape' instead of 'portrait', the subsequent call to "print" saves the figure as a PNG image using this orientation specification. This could result in an image that is rotated 90 degrees from the orientation of the original figure.

This can be verified with the following command (while the figure "fig" is open):

>> get(fig,'PaperOrientation')

In order to resolve this issue, you can insert the following line before the call to "print":

>> set(fig,'PaperOrientation','portrait');

Refer to the following documentation page for more information about the Figure Properties for Printing and Saving:

http://www.mathworks.com/help/releases/R2016a/matlab/ref/figure-properties.html

MATLAB: How to get transparent PNG file from FIG file

1. Download the "export_fig" functions from the File Exchange link:

https://www.mathworks.com/matlabcentral/fileexchange/23629-export_fig

Note that this is a 3rd party File Exchange function, and not officially supported (or tested) by MathWorks.

2. Set the 'Color' property of both figure and axes objects to 'none':

>> plot(1:10)
>> f = gcf;
>> a = gca;
>> f.Color = 'none';
>> a.Color = 'none';

3. Use the "export_fig" function with -transparent' flag to generate the PNG file:

>> export_fig -transparent

Best Answer

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MATLAB: Is the PNG of the figure rotated 90 degrees

MATLAB: How to get transparent PNG file from FIG file

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