Sha256: 32537df60172ed0796ffbb0fd9b1b74b0aaaaf5160b105e35acd4b76ab12afa1
Contents?: true
Size: 1.07 KB
Versions: 8
Compression:
Stored size: 1.07 KB
Contents
module IiifPrint
module SplitPdfs
# The purpose of this class is to split the PDF into constituent TIFF files.
#
# @see #each
class PagesToTiffsSplitter < BaseSplitter
self.image_extension = 'tiff'
DEFAULT_COMPRESSION = 'lzw'.freeze
self.compression = DEFAULT_COMPRESSION
private
def gsdevice
color, channels, bpc = pdfinfo.color
device = nil
if color == 'gray'
# CCITT Group 4 Black and White, if applicable:
if bpc == 1
device = 'tiffg4'
self.compression = 'g4'
elsif bpc > 1
# 8 Bit Grayscale, if applicable:
device = 'tiffgray'
end
end
# otherwise color:
device = colordevice(channels, bpc) if device.nil?
device
end
def colordevice(channels, bpc)
bits = bpc * channels
# will be either 8bpc/16bpd color TIFF,
# with any CMYK source transformed to 8bpc RBG
bits = 24 unless [24, 48].include? bits
"tiff#{bits}nc"
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems