ImageMagick® is used to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, GIF, HEIC, TIFF, DPX, EXR, WebP, Postscript, PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.
Wand is a ctypes-based simple ImageMagick binding for Python, so go through the step-by-step guide on how to install it.
Let’s start by installing ImageMagic:
brew install imagemagick@6
Next, create a symbolic link, with the following command (replace <your specific 6 version> with your specific version):
ln -s /usr/local/Cellar/imagemagick@6/<your specific 6 version>/lib/libMagickWand-6.Q16.dylib /usr/local/lib/libMagickWand.dylib
In my case, it was:
ln -s /usr/local/Cellar/imagemagick@6/6.9.10-0/lib/libMagickWand-6.Q16.dylib /usr/local/lib/libMagickWand.dylib
Let’s install Wand
pip3 install Wand
Now, let’s try to run the code
from wand.image import Image
…
with Image(filename=sourceFullPathFilename) as img:
img.save(filename=targetFilenameFull)
Unfortunately, I got the following error message:
wand.exceptions.DelegateError: FailedToExecuteCommand `’gs’ -sstdout=%stderr -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 ‘-sDEVICE=pngalpha’ -dTextAlphaBits=4 -dGraphicsAlphaBits=4 ‘-r72x72’ ‘-sOutputFile=/var/folders/n7/9xyh2rj14qvf3hrmr7g9b4gm0000gp/T/magick-31607l23fY21KEi6b%d’ ‘-f/var/folders/n7/9xyh2rj14qvf3hrmr7g9b4gm0000gp/T/magick-31607_nNNZjiBBusp’ ‘-f/var/folders/n7/9xyh2rj14qvf3hrmr7g9b4gm0000gp/T/magick-31607Zfemn9tWrdiY” (1) @ error/pdf.c/InvokePDFDelegate/292
Exception ignored in: <bound method Resource.__del__ of <wand.image.Image: (empty)>>
It seems that ghostscript is not installed by default, so let’s install it:
brew install ghostscript
Now we will need to create a soft link to /usr/bin, but /usr/bin/ in OS X 10.11+ is protected.
Just follow these steps:
1. Reboot to Recovery Mode. Reboot and hold “Cmd + R” after start sound.
2. In Recovery Mode go to Utilities -> Terminal.
3. Run: csrutil disable
4. Reboot in Normal Mode.
5. Do the “sudo ln -s /usr/local/bin/gs /usr/bin/gs” in terminal.
6. Do the 1 and 2 step. In terminal enable back csrutil by run: csrutil enable(based on this)
Now it works – Enjoy!
TechnoFob 