87 add blurring tutorial

[EscapedGibbon]

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[stropitek]

However, this also means that every pixel has the same weight to the algorithm regardless of its position

This is not an explanation of why mean blur is potentially inferior to other types of blur. It's just an explanation about how the algorithm works. I suppose gaussian blur has nicer mathematical properties, but I would not really be able to expand much on that. Either drop this or try to do some research to have a valid explanation of why gaussian blur is a better choice in some circumstances.

[stropitek]

Not really understand what you mean by "If box blur looks like that ... gaussian blur might look like that". You explained that box blur is any blur that uses a convolution matrix no?

[stropitek]

The values of the table will probably be floating numbers rather than integers

In what circumstances?

[stropitek]

Would it be worse with mean blur?

[stropitek]

If an image is of decent quality and you want .

There is an unfinished phrase

[stropitek]

Some parts look good, and I like the gif on convolution

[stropitek]

Gaussian blur applies gaussian distribution formula to create a matrix which weighted average for convolution which means that it takes into account the position of the pixel as well.

The sentence is not very clear to me (at least there systax errors).

Also the point you do about performance difference between box blur and gaussian at the beginning of the article does not seem obvious to me. You are saying that calculating the kernel values makes it slower, but that has to be done only once so I don't think that affects performance.