Viewing file:  ImageMode.py (2.03 KB) -rw-r--r--
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#
# The Python Imaging Library.
# $Id$
#
# standard mode descriptors
#
# History:
# 2006-03-20 fl Added
#
# Copyright (c) 2006 by Secret Labs AB.
# Copyright (c) 2006 by Fredrik Lundh.
#
# See the README file for information on usage and redistribution.
#
# mode descriptor cache
_modes = None
class ModeDescriptor:
"""Wrapper for mode strings."""
def __init__(self, mode, bands, basemode, basetype):
self.mode = mode
self.bands = bands
self.basemode = basemode
self.basetype = basetype
def __str__(self):
return self.mode
def getmode(mode):
"""Gets a mode descriptor for the given mode."""
global _modes
if not _modes:
# initialize mode cache
modes = {}
for m, (basemode, basetype, bands) in {
# core modes
"1": ("L", "L", ("1",)),
"L": ("L", "L", ("L",)),
"I": ("L", "I", ("I",)),
"F": ("L", "F", ("F",)),
"P": ("P", "L", ("P",)),
"RGB": ("RGB", "L", ("R", "G", "B")),
"RGBX": ("RGB", "L", ("R", "G", "B", "X")),
"RGBA": ("RGB", "L", ("R", "G", "B", "A")),
"CMYK": ("RGB", "L", ("C", "M", "Y", "K")),
"YCbCr": ("RGB", "L", ("Y", "Cb", "Cr")),
"LAB": ("RGB", "L", ("L", "A", "B")),
"HSV": ("RGB", "L", ("H", "S", "V")),
# extra experimental modes
"RGBa": ("RGB", "L", ("R", "G", "B", "a")),
"LA": ("L", "L", ("L", "A")),
"La": ("L", "L", ("L", "a")),
"PA": ("RGB", "L", ("P", "A")),
}.items():
modes[m] = ModeDescriptor(m, bands, basemode, basetype)
# mapping modes
for i16mode in (
"I;16",
"I;16S",
"I;16L",
"I;16LS",
"I;16B",
"I;16BS",
"I;16N",
"I;16NS",
):
modes[i16mode] = ModeDescriptor(i16mode, ("I",), "L", "L")
# set global mode cache atomically
_modes = modes
return _modes[mode]
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