Use python wand to grayscale image

Question

I want to use the Python API binding for ImageMagick http://wand-py.org to directly manipulate images. I am however not able to deduce from the documentation how to use a grayscale transformation. Can anybody provide information on this problem?

from wand.image import Image
try:
  with Image(file=path) as img:
    img.grayscale() # PSEUDOCODE for my given problem
except:
  pass

Answer 1

This can be achieved by setting the colorspace of the image.

from wand.image import Image
with Image(filename='color.jpg') as img:
    img.type = 'grayscale';
    img.save(filename='grayscale.jpg');

further reading:

• http://docs.wand-py.org/en/latest/wand/image.html#wand.image.IMAGE_TYPES
• http://docs.wand-py.org/en/latest/guide/colorspace.html

Answer 2

This is the correct code:

you need to transform the colorspace:

  with Image(filename=str(f)) as img:
        img.transform_colorspace('gray')