Wand experiments with PixelGet{Red,Green,Blue,Alpha}Quantum() functions

gistfile1.py

import ctypes

from wand.api import library
from wand.color import Color


library.PixelGetRedQuantum.argtypes = [ctypes.c_void_p]
library.PixelGetRedQuantum.restype = ctypes.c_size_t

library.PixelGetGreenQuantum.argtypes = [ctypes.c_void_p]
library.PixelGetGreenQuantum.restype = ctypes.c_size_t

library.PixelGetBlueQuantum.argtypes = [ctypes.c_void_p]
library.PixelGetBlueQuantum.restype = ctypes.c_size_t

library.PixelGetAlphaQuantum.argtypes = [ctypes.c_void_p]
library.PixelGetAlphaQuantum.restype = ctypes.c_size_t


with Color('#ff0088') as c:
    print (c.red, c.green, c.blue, c.alpha)
    # Prints: (1.0, 0.0, 0.5333333333333333, 1.0)

    print (
        library.PixelGetRedQuantum(c.resource),
        library.PixelGetGreenQuantum(c.resource),
        library.PixelGetBlueQuantum(c.resource),
        library.PixelGetAlphaQuantum(c.resource),
    )
    # Prints: (65535L, 0L, 34952L, 65535L)

Apparently you can override output color depth on the convert command line using the -depth switch:

convert -size 256x256 -depth 8 img.rgba img.png

Not sure how to do this in Wand but ImageMagick seems capable.

More:
Trouble setting RGB color depth
Controling the Quality of Images

There's a way to specify image 'depth' for the output image (image.depth(8)) but it doesn't alter the internal representation, just the output format, it seems.

So yeah, I'll need to use ScaleQuantumToChar() or its equivalent.

@inactivist Thanks for your surveys.