How to achieve the picture "encryption" problem, Gao Jin.

For some images, "encrypted decryption" (not base64 encryption and decryption image URL address), the encrypted image can be viewed on the Web page normally.

These images are only encrypted inside some text copyright content, want to ask there is no way to do not damage the image quality of the case of the picture to write operations ?

Before looking at lofter to do this thing, but do not know how to achieve. Ask for expert guidance.

Reply content:

For some images, "encrypted decryption" (not base64 encryption and decryption image URL address), the encrypted image can be viewed on the Web page normally.

These images are only encrypted inside some text copyright content, want to ask there is no way to do not damage the image quality of the case of the picture to write operations ?

Before looking at lofter to do this thing, but do not know how to achieve. Ask for expert guidance.

Completely lossless has not seen, but "hacker defense" in some period there has been a similar "lossy" algorithm, such algorithms are mainly using the human eye on the RGB color space limited cognitive ability to make a fuss.

In general, it is to reduce the number of RGB values stored in the image, which is saved to write specific information. The original algorithm source can not find, so only in the Baidu Library found the relevant description.

UPDATE:

Other friends have provided more references.

It is possible to write EXIF information.

It's not called "encryption," it's a digital watermark.

