Method __init__

_plotly_utils/png.py:361–624

Create a PNG encoder object. Arguments: width, height Image size in pixels, as two separate arguments. size Image size (w,h) in pixels, as single argument. greyscale Pixels are greyscale, not RGB. alpha Input

(
        self,
        width=None,
        height=None,
        size=None,
        greyscale=Default,
        alpha=False,
        bitdepth=8,
        palette=None,
        transparent=None,
        background=None,
        gamma=None,
        compression=None,
        interlace=False,
        planes=None,
        colormap=None,
        maxval=None,
        chunk_limit=2**20,
        x_pixels_per_unit=None,
        y_pixels_per_unit=None,
        unit_is_meter=False,
    )

    """

    def __init__(
        self,
        width=None,
        height=None,
        size=None,
        greyscale=Default,
        alpha=False,
        bitdepth=8,
        palette=None,
        transparent=None,
        background=None,
        gamma=None,
        compression=None,
        interlace=False,
        planes=None,
        colormap=None,
        maxval=None,
        chunk_limit=2**20,
        x_pixels_per_unit=None,
        y_pixels_per_unit=None,
        unit_is_meter=False,
    ):
        """
        Create a PNG encoder object.

        Arguments:

        width, height
          Image size in pixels, as two separate arguments.
        size
          Image size (w,h) in pixels, as single argument.
        greyscale
          Pixels are greyscale, not RGB.
        alpha
          Input data has alpha channel (RGBA or LA).
        bitdepth
          Bit depth: from 1 to 16 (for each channel).
        palette
          Create a palette for a colour mapped image (colour type 3).
        transparent
          Specify a transparent colour (create a ``tRNS`` chunk).
        background
          Specify a default background colour (create a ``bKGD`` chunk).
        gamma
          Specify a gamma value (create a ``gAMA`` chunk).
        compression
          zlib compression level: 0 (none) to 9 (more compressed);
          default: -1 or None.
        interlace
          Create an interlaced image.
        chunk_limit
          Write multiple ``IDAT`` chunks to save memory.
        x_pixels_per_unit
          Number of pixels a unit along the x axis (write a
          `pHYs` chunk).
        y_pixels_per_unit
          Number of pixels a unit along the y axis (write a
          `pHYs` chunk). Along with `x_pixel_unit`, this gives