The Pillow library of Python is a fork of the older PIL (Python Imaging Library) project. It allows easy scripted manipulation of many image types. Essentially I'm using it mostly just to remove image meta data like GPS coordinates, and to crop and resize, but it can do much more.
| Code Block | Code Desc |
|---|---|
from PIL import Image
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with Image.open('<localfile.jpg>') as img:
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Using with ensures that original is closed immediately after loading |
img.load()
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Load local image to memory |
img.format, img.size, img.mode
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Show file type, show image size in pixels, show mode such as RGB |
img.width, img.height
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Show width, height in pixels |
crop1 = img.crop((<start_x>,<start_y>,<end_x>,<end_y>))
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x/y is horizontal/vertical with origin in upper left |
resize1 = crop1.resize((crop1.width // 4, crop1.height // 4))
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Reduce x/y resolution by factor of 4 |
rotate1 = resize1.rotate(n)
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Rotate image counter-clockwise n degrees |
| Cameras default to landscape, images taken in portrait will be oriented wrong. | |
| Rotate can be used to reorient these, but use the additional argument 'expand=1' to preserve dimensions | |
rotate1.save('<newlocalfile.jpg>')
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Write modified image to local |
rotate1_thumb = rotate1.thumbnail((x,y))
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Create an image with x,y max dimensions. |
| This is handy as it will preserve dimensions, useful for making thumbnails. | |
exif_dict = dict(<img>._getexif().items())
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Capture metadata to dictionary |
| Use the link at bottom to lookup tags in the dict using dec ID column | |
| Note that many tags won't be available. Use try/except to attempt to load data from dict. |