How to save image?

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TAY 2014-11-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/161829-how-to-save-image

评论： Image Analyst 2021-10-31

采纳的回答： Image Analyst

在 MATLAB Online 中打开

I have a set of image data which is 256x256 matrix. I display the image data using the code below;

load topomatrix;
figure;
imshow(topomatrix,'displayrange',[]);
colormap('jet');

Now, I want to save the image with full display range and colormap, anyone know how to do it, is it using IMWRITE?

imwrite(topomatrix, 'topo.jpg');

Does anyone know how to do it, thank in advance!!!

采纳的回答

Image Analyst 2014-11-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/161829-how-to-save-image#answer_158184

在 MATLAB Online 中打开

You'll need to scale it and convert it to an 8 bit RGB image.

image8Bit = uint8(255 * mat2gray(topomatrix));
jetMap = jet(256);
imshow(image8bit);
colormap(jetMap);
rgbImageToSave = ind2rgb(image8Bit, jetMap);
imwrite(rgbImageToSave, 'rgbImage.png'); % Save as PNG to avoid jpeg artifacts.

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Jane 2021-10-31

What do we do if we have a 3d matrix instead?

Image Analyst 2021-10-31

If it has 3 planes/slices then you can use imwrite(). It will just consider it a color image. If you have more planes/slices, then either save each 2-D image separately or save the 3-D image into a .mat file.

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