A vague implementation of a convolution filter.
WANT TO USE A CUSTOM FILTER? The filter system works on a basis of 5 layers of 5 characters, either 1's or 0's. The four corners do not count, however they are required in the code anyway. To create a filter code, just combine the five layers into one line of text. Example filter (a 'J'): 0000001110001000110000000
