algorithm - Is it worth it to look at a method that does exactly the opposite of what you want to do? -

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Take for example [pdf] If I want to add a degradation of weather in a clear picture, then to see that paper Will it be worth it and reverse it? What is the special way to reverse the algorithm if it is possible?

Draemon is correct, there is no general view in your case, I will read the paper.

If you want to add or remove the erosion of weather, you need to know how the weather seems to fall. That letter will contain information on it, and this can be an easy answer.

There may be an example on breaking a replacement cipher

You can of course read the paper how to encrypt it with some replacement cipher .

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