what encryption is used?

I designed an image encryption and decryption algorithm in Qt Creator using C++. I used it to plot RGB histograms of the original encrypted and decrypted image. What other measures can I use to show that my algorithm is good?

• The algorithm is a loss-less encryption algorithm.

• Answer:

  I think there are two important things. First, if it's a lossless algorithm, create as many test cases as possible. However, if it's a lossy compression algorithm, I'd look for the following: Image quality, as compared to JPEGs of the same size. Basically if you compare your image with the JPEG one, which one is closer to the original? With as many test cases as possible. Speed of the algorithm: how fast you can unpack the image, how much will it drain my battery? Again, a comparison with JPEG as the standing standard would be good. Do you own the rights on the compression method, or does it employ patented methods, like JPEG does? I would create an open source project like libpng and I would publish it, to also get feedback from other developers or image processing specialists.