Saving figure as a image

Question

meghannmarie 2021-4-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/790229-saving-figure-as-a-image

评论： meghannmarie 2021-4-16

I am saving my output figures as images. But when I run my matlab script from different computers, the figures look different. As in the labels and legends are different sizes, etc. I want the image outputs to be exactly the same no matter what computer I run it on, I do not want to have computer specific scripts.

I am not a graphics person, so I do not know what causes this. Whether it is the screen resolution, renderer, file type, options or what? I do not know where to start.

The code I am using to save figure is:

output_file = 'example_image.png'
saveas(figure1,fullfile(folderName, output_file));

which outputs the following image:

Help!!

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Adam Danz 2021-4-13

From the figure menu, when I select File > SaveAs > PDF the results look quite similar.

meghannmarie 2021-4-13

编辑：meghannmarie 2021-4-13

What I am trying to do is get graphics that look exactly the same no matter what computer they are run on. I am running the same scripts (and data) on our high performance computer and my local laptop and getting graphics that look different. I do not want to have to tweak graphics depending on what computer they are run on (it can be 100s of graphics). I need them to be the same because then they are emdedded into another document.

I do not need to save as pdf, that was just the other persons suggestions, I would prefer an image file.

If you look at .png image outputs from each computer, they look different. The axes are labeled differently.

I am thinking it is something to do with the size of figure window/fonts and how it is choosing what labels to show or not to show that is making it different...

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Answer 1

Adam Danz 2021-4-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/790229-saving-figure-as-a-image#answer_674276

Comparing the two png files in one of your previous comments shows an upper y axis in one figure that doesn't exist in the second figure. This is more than a version difference. The only why that would be possible is if the two systems are using different versions of the code or if the system using the older Matlab release is quitting early due to an error.

There is also a difference in fontsize. That can be fixed by explicitly setting the fontsizes in your code. The difference in figure size can be controlled by explicitly setting figure size.

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meghannmarie 2021-4-13

在 MATLAB Online 中打开

Okay, here are my new sample fig files and graphics files. When I open up fig file made on hpc on my laptop the title is shifted off of figure area. I do not know why, it is not doing that on the hpc (only when I open the fig back on laptop) - you can see that in the output PNG file, it looks correct. Both figures are made with the same code in 2020b, only difference is the hpc version is a linux machine and I am compiling code versus laptop being windows and I am just running function in matlab. I think both are working, the figure is just translating wrong bringing it back to my local machine.

Comparing the output PNG and JPG files, they look very close, but output image files are different sizes. For example: PNG made on HPC is 1146x938x24 whereas the PNG made on laptop is 859x703x24 and JPG made on HPC is 1562x1318x24 whereas the JPG made on laptop is 1208x1002x24.

This is code I am using to save PNG:

saveas(figure1,fullfile(folderName,output_file))

This is the code I am using to save JPG:

exportgraphics(figure1,output_file,'Resolution',220)

I think this is the major difference to overcome still. How to save out fig files so the output graphics files are the same (or very close to it). Any ideas on different ways to save files or options to set so the resulting file is the same size/resolution?

Adam Danz 2021-4-13

Regarding the inconsistent figure sizes, there are many areas to troubleshoot and I've found that exportgraphics does some unexpected things with figure size. For example in this example from the documentation, the printed fig should be "approximately 3 inches" but it's much larger when i try it (r2021a).

The export_fig function on the file exchange will likely work for you:

https://www.mathworks.com/matlabcentral/answers/47357-save-figure-in-a-certain-size#answer_57832

meghannmarie 2021-4-16

在 MATLAB Online 中打开

The export_fig fuunction still did not work. I ended up putting in a tech support ticket. There were a few differences in the computers that were causing the differences. One computer was windows and other computer was linux where I was using command prompt to run scripts. On the different computers the renderers were different, the screen resolutions were different, and they had different fonts. Once I compensated for all this (plus the other things you helped me with), then the graphics turned out very similar. Only differences left are slight differences in fonts and file size which both are just because its a different OS.

I attached the final graphics and here is my final code:

% Set Renderer
    opengl software
    set(groot, 'DefaultFigureRenderer', 'painters');
    
    % Create figure
     figure1 = figure('Position',[100,100,550,450],...
        'PaperPositionMode','auto',...
        'InvertHardcopy','on',...
        'Visible','off');
    
    % Create axes
    axes2 = axes('Parent',figure1,...
        'XAxisLocation','top',...
        'YAxisLocation','right',...
        'XColor',[56/255 87/255 35/255],...
        'YColor',[56/255 87/255 35/255],...
        'Color','None',...
        'FontSizeMode','manual',...
        'FontName','Arial',...
        'FontSize',10);
    
    hold(axes2,'on');
    axis(axes2,'ij');
    title(axes2,{[parameter ' vs. Depth' ],month_long{n}})
    
    % ..more code here
    
    % Create plot
    ax2_pos = axes2.Position; % position of first axes
    axes1 = axes('Position',ax2_pos,...
        'XAxisLocation','bottom',...
        'YAxisLocation','left',...
        'XColor',[35/255 65/255 115/255],...
        'YColor',[35/255 65/255 115/255],...
        'Color','none',...
        'FontSizeMode','manual',...
        'FontName','Arial',...
        'FontSize',10);
    
    linkprop([axes1,axes2],{'Position'}); 
    
    % ..more code here
    
    % output resolution and format
    outputDPI = '-r900';
    outputFmt = '-dpng';
    
    % control computer (hpc) screen pixel's per inch
    dispPPI = 72;
    
    % current computer's screen pixel's per inch
    ppi = get(0, 'screenpixelsperinch');
    
    % compensate for different DPI
    scale = ppi / dispPPI;
    figure1.Position(3:4) = figure1.Position(3:4)*scale;
    
    name = fullfile(folderName,output_file);
    print(figure1, name, outputFmt, outputDPI);
    close(figure1);
    

Thanks for all your help!!

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Answer 2

David Hill 2021-4-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/790229-saving-figure-as-a-image#answer_664684

You might try figure2pdf in file exchange.

https://www.mathworks.com/matlabcentral/fileexchange/71053-figure2pdf?s_tid=srchtitle

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meghannmarie 2021-4-1

It seems like this function is just outputting file to a pdf, which I need a graphic file. I will try it when I have access to my second computer, but do you know what in theis code makes the graphics the same?

Adam Danz 2021-4-13

meghannmarie's answer moved here as a comment

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The figure2pdf function does not work. The pictures still save differently on different machines.

Look at my attachments, one is saved on my laptop and one is saved on our hpc. They are different, but same exact script. I think it is something to do with resolution of screen, but how do I get around it?

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