Fix for Brave fingerprinting

[nextend]

#229

Brave browser also have fingerprinting protection for canvas. But it seems like Brave only shifts colors a little bit, so Pica is unable to generate the image while the output image could be pretty good.

[12, 23, 34, 255, 45, 56, 67, 255] <- Original
[13, 22, 34, 255, 45, 57, 66, 255] <- Brave
[86, 206, 251, 191, 18, 101, 167, 28] <- Firefox

Each color part can have +-5 difference to the original value which works good with Brave browser and still able to detect Firefox fingerprinting protection.

[annahassel]

@puzrin Hello, what do you think about this fix? Is it possible to fix pica for Brave?

[puzrin]

I don't like idea to generate "something" instead of predictable result.

[annahassel]

I don't like idea to generate "something" instead of predictable result.

Thank you for the answer!

[mylastore]

How to throw an error when fingerprinting is detected?
We want to display an error to let the user know why the image did not succeed.