Saving Image with keeping the same histogram

hello i have a double class matrix and want to save it so when i show the histogram for both saved and that matrix in matlab they will be the same. the matrix in matlab i have: img_dec Name (img_dec) Size (512x512) Bytes (2097152) Class (double) Attributes Thanks

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Answer 1

[Image Analyst]

If you save it as a .mat file, then the variable will be the same on a round trip through the file.