CODEWITHSUNDEEP
pythonimagemagickimagemagick-convertwand
JulienD
JulienD

Reputation: 35

Convert ImageMagick command to Wand Python

I'm wondering how to convert this working command line sequence from ImageMagick into a Python script using the Wand library:

/usr/local/bin/convert pic.png -alpha off +dither -colors 2 -colorspace gray -normalize -statistic median 1x200 -negate -format "%[fx:mean*w*h]" info:

My current Python code is:

with Image(filename= 'pic.png') as img:
    with img.clone() as img_copy1:
        img_copy1.alpha_channel = False
        img_copy1.quantize(number_colors= 2, colorspace_type='gray', dither= True)
        img_copy1.normalize()
        img_copy1.negate(grayscale= True)

But I still don't know how to compute the number of pixels that is part of the vertical feature...

UPDATE:

I modified my code thanks to @fmw42

with wand.image.Image(filename='pic.png') as img:
    with img.clone() as img_copy1:
        img_copy1.alpha_channel = False
        img_copy1.quantize(number_colors= 2, colorspace_type='gray', dither= True)
        img_copy1.normalize()
        img_copy1.statistic("median", width = 1, height = 200)
        img_copy1.negate()
        img.options['format'] = '%[fx:mean*w*h]'
        print(img.make_blob('INFO'))

Upvotes: 0

Views: 417

Answers (1)

fmw42
fmw42

Reputation: 53202

Here is an example that I got a while back from Eric McConville (the Wand developer) for doing fx: computations. This should give you a clue how to do yours.

from wand.image import Image
with Image(filename='zelda.png') as img:
  img.options['format'] = '%wx%h'
  print(img.make_blob('INFO'))

Eric can comment further if there is a better way to do that now.

Upvotes: 1

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