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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.
The freeimage plugin requires a `freeimage` binary. If this binary
not available on the system, it can be downloaded manually from
<https://github.com/imageio/imageio-binaries> by either
- the command line script ``imageio_download_bin freeimage``
- the Python method ``imageio.plugins.freeimage.download()``
Parameters for reading
----------------------
ignoregamma : bool
Avoid gamma correction. Default True.
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.
Generated by dwww version 1.14 on Thu Sep 18 23:38:54 CEST 2025.