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.. _PNG-FI:

PNG-FI Portable Network Graphics
================================

Extensions: ``.png``

A PNG format based on the Freeimage library.

This format supports grayscale, RGB and RGBA images.

Parameters for reading
----------------------
ignoregamma : bool
    Avoid gamma correction. Default False.

Parameters for saving
---------------------
compression : {0, 1, 6, 9}
    The compression factor. Higher factors result in more
    compression at the cost of speed. Note that PNG compression is
    always lossless. Default 9.
quantize : int
    If specified, turn the given RGB or RGBA image in a paletted image
    for more efficient storage. The value should be between 2 and 256.
    If the value of 0 the image is not quantized.
interlaced : bool
    Save using Adam7 interlacing. Default False.


