cant write image exactly shown by imshow

Question

talayeh ghodsi 2020-4-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515471-cant-write-image-exactly-shown-by-imshow

评论： talayeh ghodsi 2020-4-6

hi every body. i have written a code which the result in imshow is ok but when i want to imwrite it, its different and wrong. could any body help me please?

Echo = imread('echo60%-croped-SRAD.jpg');
Mask = imread('mask60%.jpg');
Echo = mat2gray(Echo(:,:,1));
Mask = mat2gray(Mask(:,:,1));
Echo_Com = imcomplement(Echo);
Echo_Com_Final = (Echo_Com.*Mask)*255;
imshow(Echo_Com_Final, [0 255]);
imwrite(Echo_Com_Final,map,'echo60%-croped-SRAD_complement.jpg')

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Thiago Henrique Gomes Lobato 2020-4-5

What "map" are you using? Are you sure it is the right one? Have you tried without it? Also, what exactly you mean by different and wrong?

talayeh ghodsi 2020-4-5

thanks for your respond sir

i will attach the result images of

imshow(Echo_Com_Final, [0 255]);

and

imwrite(Echo_Com_Final,'echo60%-croped-SRAD_complement.jpg'

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Answer 1

Image Analyst 2020-4-5

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515471-cant-write-image-exactly-shown-by-imshow#answer_424175

在 MATLAB Online 中打开

To write the image exactly as it is shown, you can use getframe() and then imwrite(). Keep in mind that this is like a screenshot so it won't have the same size and values as the original, underlying image, but it will be "exactly shown by imshow" that you requested

displayedImage = getframe();
imwrite(displayedImage, filename);

Or you can use export_fig()

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talayeh ghodsi 2020-4-6

exatly because of the change of the size of the result image after save as, i want to save it by imwrite. I need to keep the original size of the image

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