Saving an imagesc file as .png without the white borders?

Question

spider_plantt 2020-8-6

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https://ww2.mathworks.cn/matlabcentral/answers/576307-saving-an-imagesc-file-as-png-without-the-white-borders

编辑： DGM 2023-5-1

I want to save a series of images that output in the format 'matlab.graphics.primitive.image' as PNGs without that white border PNGs save with. My code is below--is there any way to output these images cropped of their white border? I've already tried setting my 'iptsetpref' as 'tight', to no avail.

clc;clear all;
load('sphere.mat');
for j=80:90
    I=imagesc(squeeze(sphere(:,j,:)));
    set(gca,'XTick',[]);
    set(gca,'YTick',[]);
    filename=sprintf('sphere%d',j);
    saveas(I,filename,'png');
end

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Answer 1

Sudheer Bhimireddy 2020-8-6

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https://ww2.mathworks.cn/matlabcentral/answers/576307-saving-an-imagesc-file-as-png-without-the-white-borders#answer_476269

在 MATLAB Online 中打开

Try:

print(I,filename,'-dpng');

By white border if you mean the background outside the figure, then you would have to export it to epsc format

print(I,filename,'-depsc');

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Answer 2

DGM 2022-8-3

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https://ww2.mathworks.cn/matlabcentral/answers/576307-saving-an-imagesc-file-as-png-without-the-white-borders#answer_1020165

编辑：DGM 2023-5-1

If you have an image and want to save the image, save the image. Don't display the image and then save a screenshot of the displayed image. Don't display the image and then take a photo of the monitor with your phone. Don't describe the image as a thousand words of poetry or as an interpretive dance.

Save the image array -- not the graphics object or the parent figure. Use imwrite(). Anything else is not just self-inflicted inconvenience; it's often destructive.

For saving arbitrarily-scaled data in scaled pseudocolor (as one would expect from imagesc()), See this example:

https://www.mathworks.com/matlabcentral/answers/1946888-how-to-remove-white-borders-space-from-an-rgb-image#answer_1216073

Again, this does not rely on figure capture.