MATLAB Answers

How to transform matrix into image without data loss?

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Kibong Kang
Kibong Kang on 13 May 2019
Answered: Jyotish Kumar on 21 May 2019
I want to save a matrix information using a image.
First, I transformed a matrix A=[0,255;255,0] into a image "1.jpg" using function "imwrite".
Second, I transformed the image "1.jpg" into "A_new" matrix using function "imread".
However, "A_new" matrix = [7,241;244,13] is not the same as "A" matrix.
How can I save and load the matrix information using the image without data loss?

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Answers (2)

Prathamesh Degwekar
Prathamesh Degwekar on 21 May 2019
Hi,
As far as I understand it, when imwrite converts your data array into an image, it has to use the "jpg" standard which changes the data of the array for various reasons like compression etc. Therefore when you convert the image from the matrix A into the image, that is when the data is changing into [7, 241; 244, 13].
Therefore if you want no data loss, maybe look at storing it as a bitmap image (bmp) or a raw image.
Hope this helps.
Cheers.

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Jyotish Kumar
Jyotish Kumar on 21 May 2019
JPG format compresses the file while conversion, so it changes the value. Try with another Image format like PNG which is more intact while conversion.

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