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Updated AffineTransform docstring to mention it uses the inverse matrix #8735

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hugovk merged 1 commit into from
Feb 6, 2025
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Updated AffineTransform docstring to mention it uses the inverse matrix #8735

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8 changes: 4 additions & 4 deletions src/PIL/ImageTransform.py
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Expand Up @@ -48,17 +48,17 @@ class AffineTransform(Transform):
Define an affine image transform.

This function takes a 6-tuple (a, b, c, d, e, f) which contain the first
two rows from an affine transform matrix. For each pixel (x, y) in the
output image, the new value is taken from a position (a x + b y + c,
d x + e y + f) in the input image, rounded to nearest pixel.
two rows from the inverse of an affine transform matrix. For each pixel
(x, y) in the output image, the new value is taken from a position (a x +
b y + c, d x + e y + f) in the input image, rounded to nearest pixel.

This function can be used to scale, translate, rotate, and shear the
original image.

See :py:meth:`.Image.transform`

:param matrix: A 6-tuple (a, b, c, d, e, f) containing the first two rows
from an affine transform matrix.
from the inverse of an affine transform matrix.
"""

method = Image.Transform.AFFINE
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