Is there a way to use the vignette functionality of ImageMagick with Wand?

Question

I've been searching for a way to use the vignette functionality of ImageMagick with Wand, but I can't find how to do it in Wand's documentation.

Is there a well hidden way to do it, and if there isn't, what are the alternatives ?

score 2 · Accepted Answer · answered May 19 '17 at 11:54

For python's wand library, you'll need to implement the C-API with library.api module.

import ctypes
from wand.api import library
from wand.image import Image

# Define C-API
library.MagickVignetteImage.argtypes = [ctypes.c_void_p,  # Wand
                                        ctypes.c_double,  # Radius
                                        ctypes.c_double,  # Sigma
                                        ctypes.c_long,    # x
                                        ctypes.c_long]    # y
# Warning: `x' & `y' are ssize_t. Usually the same size as size_t, or long type.

# Extent Image class with new method
class VignetteImage(Image):
    def vignette(self, radius=0.0, sigma=0.0, offset_x=0, offset_y=0):
        library.MagickVignetteImage(self.wand,
                                    radius,
                                    sigma,
                                    offset_x,
                                    offset_y)

# Usage
with VignetteImage(filename="rose:") as rose:
    rose.vignette(0.0, 5.0)
    rose.save(filename="RoseVignette.png")