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Improved explanation of fromarray "mode" parameter #5849

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Nov 23, 2021
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Improved explanation of fromarray "mode" parameter #5849

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19 changes: 16 additions & 3 deletions src/PIL/Image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2773,16 +2773,29 @@ def fromarray(obj, mode=None):

from PIL import Image
import numpy as np
im = Image.open('hopper.jpg')
im = Image.open("hopper.jpg")
a = np.asarray(im)

Then this can be used to convert it to a Pillow image::

im = Image.fromarray(a)

:param obj: Object with array interface
:param mode: Mode to use (will be determined from type if None)
See: :ref:`concept-modes`.
:param mode: Optional mode to use when reading ``obj``. Will be determined from
type if ``None``.

This will not be used to convert the data after reading, but will be used to
change how the data is read::

from PIL import Image
import numpy as np
a = np.full((1, 1), 300)
im = Image.fromarray(a, mode="L")
im.getpixel((0, 0)) # 44
im = Image.fromarray(a, mode="RGB")
im.getpixel((0, 0)) # (44, 1, 0)

See: :ref:`concept-modes` for general information about modes.
:returns: An image object.

.. versionadded:: 1.1.6
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