How to create an image from an RGB Matrix

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Pavel Chatterjee 2018-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/389829-how-to-create-an-image-from-an-rgb-matrix

评论： Jan 2018-3-22

采纳的回答： KSSV

I have a RGB matrix and that is very big. However I would like to create an image out of it. Can you please help?

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Greg 2018-3-22

You keep mentioning loops, what in the world are you looping?

KSSV gave the full answer, don't put any other code with it. 1584x2780x3 is not a big RGB matrix. That should display nearly instantaneously.

Jan 2018-3-22

@Pavel Chatterjee: I agree with Greg: The problem is not the display of the array, but the creation. Then post the code, which takes so much time. Usually a forgotten pre-allocation is a cause for slow code, but a 1584x2780 array is not large, such that this would waste some seconds of runtime only.

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采纳的回答

KSSV 2018-3-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/389829-how-to-create-an-image-from-an-rgb-matrix#answer_311262

在 MATLAB Online 中打开

Let I be your mxnx3 RGB matrix.

imshow(I) ;
saveas(gcf,'myimage.jpg')

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Pavel Chatterjee 2018-3-22

Nope! It gives me the same wait. It doesnt give an output.

Pavel Chatterjee 2018-3-22

Also the code gives the desired section of the image if i run lets say from row=1:100 and col=1:100.... But if I run it for its entire length it runs forever. Kept it overnight as well to check, no output

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