def _make_header(cls, mode, size, depth=8):
assert depth in (8, 16, 32), 'Invalid depth: %d' % (depth)
color_mode = pil_io.get_color_mode(mode)
alpha = int(mode.upper().endswith('A'))
channels = ColorMode.channels(color_mode, alpha)
return FileHeader(width=size[0],
height=size[1],
depth=depth,
channels=channels,
color_mode=color_mode)
def _check_channels(channels, color_mode):
expected_channels = ColorMode.channels(color_mode)
if len(channels) > expected_channels:
logger.warning('Channels mismatch: expected %g != given %g' %
(expected_channels, len(channels)))
channels = channels[:expected_channels]
elif len(channels) < expected_channels:
raise ValueError('Channels mismatch: expected %g != given %g' %
(expected_channels, len(channels)))
return channels
def _check_channels(channels, color_mode):
expected_channels = ColorMode.channels(color_mode)
if len(channels) > expected_channels:
# Seems possible when FilterMask is attached.
logger.debug('Channels mismatch: expected %g != given %g' %
(expected_channels, len(channels)))
channels = channels[:expected_channels]
elif len(channels) < expected_channels:
raise ValueError('Channels mismatch: expected %g != given %g' %
(expected_channels, len(channels)))
return channels
def _make_header(cls, mode, size, depth=8):
from .pil_io import get_color_mode
assert depth in (8, 16, 32), 'Invalid depth: %d' % (depth)
assert size[0] <= 300000, 'Width too large > 300,000'
assert size[1] <= 300000, 'Height too large > 300,000'
version = 1
if size[0] > 30000 or size[1] > 30000:
logger.debug('Width or height larger than 30,000 pixels')
version = 2
color_mode = get_color_mode(mode)
alpha = int(mode.upper().endswith('A'))
channels = ColorMode.channels(color_mode, alpha)
return FileHeader(version=version,
width=size[0],
height=size[1],
depth=depth,
channels=channels,
color_mode=color_mode)
