ImageGear for C and C++ on Linux v20.0 - Updated
Image Encryption
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ImageGear provides a pair of image processing functions that perform image encryption/decryption operations. These functions change the image bitmap,  modifying the format of the pixel data stored within it.

IG_IP_encrypt() Encrypts the image bitmap using the specified password string. To successfully decrypt the image bitmap, the specified password will be needed.
IG_IP_decrypt() Decrypts an image bitmap using the password string specified during encryption. If the password is the same as used with IG_IP_encrypt(), then the decryption will be successful, and the original image bitmap will be restored.

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