How to save image after encryption?

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Arshub
Arshub 2022-1-15
评论： Wajid 2022-12-20
I have code for encrypt an image, then ineed to save image after encryption to use it in another seperate code .
which command is prefere, imsave, imwrite? I try to use both but the saved image can't be showed correctly when i used imshow command.
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Arshub
Arshub 2022-1-16
@Jan i mean : I have an image say 'lena.png ' if i read this image then shuffle the image, we get a new image after shuffle. I need save the new image in a new name say 'lena2.png'.
may be i need the new image 'lena2.png' in anther program to reshuffle the 'lena2.png' to get the original image lena.png '.

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回答（2 个）

Walter Roberson
Walter Roberson 2022-1-16
My suspicion would be that your original image is uint8 and that when you did the encryption, you did not make sure to create uint8 . Perhaps your results are all integers 0 to 255, but I suspect that class() of them is double() .
If your encrypted image is double() but only uses integers 0 to 255, then uint8() it.
If your encrypted image is double() but has some entries that are not integers 0 to 255, then you might have a problem.
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Arshub
Arshub 2022-1-16
yes, may image after permutation in extention double and pixel values between 0 to 255.
but when i save them in png extention, all pixels become 255.
Walter Roberson
Walter Roberson 2022-1-16
Either be more careful in doing the permutation to retain the original data type, or else take uint8() of the permutation.

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Image Analyst
Image Analyst 2022-1-16
Unless your encryption produced another uint8 or uint16 image, you're probably best just saving it as a binary file with a .bin or .dat extension since no standard program will be able to read it and decrypt it successfully if you save as a .PNG extension - it will just confuse them and they'll throw an error. Something like (untested):
fid = fopen('encryptedImage.bin', 'wb');
fprintf(fid, '%c', yourImage);
fclose(fid);

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