fname : str or file-like
Path string to a filename, or a Python file-like object.
If format is None and fname is a string, the output
format is deduced from the extension of the filename.
arr : array-like
An MxN (luminance), MxNx3 (RGB) or MxNx4 (RGBA) array.
vmin, vmax: [ None | scalar ]
vmin and vmax set the color scaling for the image by fixing the
values that map to the colormap color limits. If either vmin
or vmax is None, that limit is determined from the arr
min/max value.
cmap : matplotlib.colors.Colormap, optional
For example, cm.viridis. If None, defaults to the
image.cmap rcParam.
format : str
One of the file extensions supported by the active backend. Most
backends support png, pdf, ps, eps and svg.
origin : [ ‘upper’ | ‘lower’ ]
Indicates whether the (0, 0) index of the array is in the
upper left or lower left corner of the axes. Defaults to the
image.origin rcParam.
dpi : int
The DPI to store in the metadata of the file. This does not affect the
resolution of the output image.
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