GRIB-PIL GRIB

Extensions: .grib

From the Pillow docs:

New in version Pillow: 1.1.5

PIL provides a stub driver for GRIB files.

The driver requires the file to start with a GRIB header. If you have files with embedded GRIB data, or files with multiple GRIB fields, your application has to seek to the header before passing the file handle to PIL.

To add read or write support to your application, use PIL.GribStubImagePlugin.register_handler().

Parameters for reading

pilmode : str

From the Pillow documentation:

• ‘L’ (8-bit pixels, grayscale)
• ‘P’ (8-bit pixels, mapped to any other mode using a color palette)
• ‘RGB’ (3x8-bit pixels, true color)
• ‘RGBA’ (4x8-bit pixels, true color with transparency mask)
• ‘CMYK’ (4x8-bit pixels, color separation)
• ‘YCbCr’ (3x8-bit pixels, color video format)
• ‘I’ (32-bit signed integer pixels)
• ‘F’ (32-bit floating point pixels)

PIL also provides limited support for a few special modes, including ‘LA’ (‘L’ with alpha), ‘RGBX’ (true color with padding) and ‘RGBa’ (true color with premultiplied alpha).

When translating a color image to grayscale (mode ‘L’, ‘I’ or ‘F’), the library uses the ITU-R 601-2 luma transform:

L = R * 299/1000 + G * 587/1000 + B * 114/1000

as_gray : bool

If True, the image is converted using mode ‘F’. When mode is not None and as_gray is True, the image is first converted according to mode, and the result is then “flattened” using mode ‘F’.