Matteo Sisti Sette escribió:
Is there any easy workaround?
Well the workaround (for pix_2grey, not pix_grey) is [pix_contrast] with contrast=1 and saturation=0; I tried it and it works fine.
Comparing the source code of [pix_contrast] with that of [pix_2grey] may perhaps help find what's wrong with pix_2grey?