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Update concepts.rst; clarify 'bands'
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@ -4,15 +4,20 @@ Concepts
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The Python Imaging Library handles *raster images*; that is, rectangles of
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pixel data.
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.. _concept-bands:
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Bands
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-----
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An image can consist of one or more bands of data. The Python Imaging Library
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allows you to store several bands in a single image, provided they all have the
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same dimensions and depth.
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same dimensions and depth. For example, a PNG image might have 'R', 'G', 'B',
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and 'A' bands for the red, green, blue, and alpha transparency values. Many
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operations act on each band separately, e.g., histograms. It is often useful to
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think of each pixel as having one value per band.
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To get the number and names of bands in an image, use the
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:py:meth:`~PIL.Image.Image.getbands` method.
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:py:meth:`~PIL.Image.Image.getbands` method.
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.. _concept-modes:
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