Some parameters like blurhash expect a point value to work as expected.
Point values are specified with one or two integers separated by a comma. This is useful to specify a point or measure with two coordinates x and y.
Example
Simple point values are specified using only one integer like blurhash=1, this is equivalent of having a point with x and y equal to 1 (equivalent to use blurhash=1,1).
It is possible to specify x and y for a point value using two integers separated by a comma like blurhash=4,3, this will set x to a value of 4 and y to 3.