scale_dcci2x
Arguments:
- _edge_threshold>=0,_exponent>0,_extend_1px={ 0=false | 1=true }
Description:
Double image size using directional cubic convolution interpolation,
as described in https://en.wikipedia.org/wiki/Directional_Cubic_Convolution_Interpolation.
Default values:
edge_threshold=1.15, exponent=5 and extend_1px=0.
Example of use: