242 lines
8.7 KiB
Python
242 lines
8.7 KiB
Python
#!/usr/bin/env python
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# coding=utf-8
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from __future__ import division
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import os
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import sys
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try:
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from PIL import Image, ImageOps
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except ImportError as error:
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raise ImportError("{}: {} requres Python Imaging Library (PIL). "
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"Install with `pip` or OS-specific package "
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"management tool."
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.format(error, sys.argv[0]))
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VERSION_STRING = '0.01'
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LCD_WIDTH = 96
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LCD_HEIGHT = 16
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LCD_NUM_BYTES = LCD_WIDTH * LCD_HEIGHT // 8
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LCD_PADDED_SIZE = 1024
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INTELHEX_DATA_RECORD = 0x00
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INTELHEX_END_OF_FILE_RECORD = 0x01
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INTELHEX_EXTENDED_LINEAR_ADDRESS_RECORD = 0x04
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INTELHEX_BYTES_PER_LINE = 16
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INTELHEX_MINIMUM_SIZE = 4096
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def split16(word):
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"""return high and low byte of 16-bit word value as tuple"""
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return (word >> 8) & 0xff, word & 0xff
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def intel_hex_line(record_type, offset, data):
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"""generate a line of data in Intel hex format"""
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# length, address offset, record type
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record_length = len(data)
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yield ':{:02X}{:04X}{:02X}'.format(record_length, offset, record_type)
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# data
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for byte in data:
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yield "{:02X}".format(byte)
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# compute and write checksum (with DOS line ending for compatibility/safety)
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yield "{:02X}\r\n".format((((sum(data, # sum data ...
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record_length # ... and other ...
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+ sum(split16(offset)) # ... fields ...
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+ record_type) # ... on line
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& 0xff) # low 8 bits
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^ 0xff) # two's ...
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+ 1) # ... complement
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& 0xff) # low 8 bits
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def intel_hex(file, bytes_, start_address=0x0):
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"""write block of data in Intel hex format"""
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def write(generator):
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file.write(''.join(generator))
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if len(bytes_) % INTELHEX_BYTES_PER_LINE != 0:
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raise ValueError("Program error: Size of LCD data is not evenly divisible by {}"
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.format(INTELHEX_BYTES_PER_LINE))
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address_lo = start_address & 0xffff
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address_hi = (start_address >> 16) & 0xffff
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write(intel_hex_line(INTELHEX_EXTENDED_LINEAR_ADDRESS_RECORD, 0,
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split16(address_hi)))
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size_written = 0
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while size_written < INTELHEX_MINIMUM_SIZE:
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offset = address_lo
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for line_start in range(0, len(bytes_), INTELHEX_BYTES_PER_LINE):
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write(intel_hex_line(INTELHEX_DATA_RECORD, offset,
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bytes_[line_start:line_start + INTELHEX_BYTES_PER_LINE]))
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size_written += INTELHEX_BYTES_PER_LINE
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if size_written >= INTELHEX_MINIMUM_SIZE:
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break
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offset += INTELHEX_BYTES_PER_LINE
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write(intel_hex_line(INTELHEX_END_OF_FILE_RECORD, 0, ()))
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def img2hex(input_filename,
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output_file,
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preview_filename=None,
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threshold=128,
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dither=False,
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negative=False):
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"""
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Convert 'input_filename' image file into Intel hex format with data
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formatted for display on TS100 LCD and file object.
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Input image is converted from color or grayscale to black-and-white,
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and resized to fit TS100 LCD screen as necessary.
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Optionally write resized/thresholded/black-and-white preview image
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to file specified by name.
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Optional `threshold' argument 8 bit value; grayscale pixels greater than
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this become 1 (white) in output, less than become 0 (black).
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Unless optional `dither', in which case PIL grayscale-to-black/white
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dithering algorithm used.
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Optional `negative' inverts black/white regardless of input image type
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or other options.
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"""
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try:
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image = Image.open(input_filename)
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except BaseException as e:
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raise IOError("error reading image file \"{}\": {}".format(input_filename, e))
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# convert to luminance
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# do even if already black/white because PIL can't invert 1-bit so
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# can't just pass thru in case --negative flag
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# also resizing works better in luminance than black/white
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# also no information loss converting black/white to grayscale
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if image.mode != 'L':
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image = image.convert('L')
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if image.size != (LCD_WIDTH, LCD_HEIGHT):
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image = image.resize((LCD_WIDTH, LCD_HEIGHT), Image.BICUBIC)
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if negative:
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image = ImageOps.invert(image)
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threshold = 255 - threshold # have to invert threshold
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if dither:
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image = image.convert('1')
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else:
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image = image.point(lambda pixel: 0 if pixel < threshold else 1, '1')
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if preview_filename:
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image.save(preview_filename)
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''' DEBUG
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for row in range(LCD_HEIGHT):
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for column in range(LCD_WIDTH):
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if image.getpixel((column, row)): sys.stderr.write('1')
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else: sys.stderr.write('0')
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sys.stderr.write('\n')
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'''
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# pad to this size (also will be repeated in output Intel hex file)
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data = [0] * LCD_PADDED_SIZE
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# magic/undocumented/required header in endian-reverse byte order
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data[0] = 0x55
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data[1] = 0xAA
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data[2] = 0x0D
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data[3] = 0xF0
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# convert to TS100 LCD format
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for ndx in range(LCD_WIDTH * 16 // 8):
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bottom_half_offset = 0 if ndx < LCD_WIDTH else 8
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byte = 0
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for y in range(8):
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if image.getpixel((ndx % LCD_WIDTH, y + bottom_half_offset)):
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byte |= 1 << y
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# store in endian-reversed byte order
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data[4 + ndx + (1 if ndx % 2 == 0 else -1)] = byte
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intel_hex(output_file, data, 0x0800F800)
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def parse_commandline():
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parser = argparse.ArgumentParser(
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formatter_class=argparse.ArgumentDefaultsHelpFormatter,
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description="Convert image file for display on TS100 LCD "
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"at startup")
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def zero_to_255(text):
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value = int(text)
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if not 0 <= value <= 255:
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raise argparse.ArgumentTypeError("must be integer from 0 to 255 ")
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return value
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parser.add_argument('input_filename',
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help="input image file")
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parser.add_argument('output_filename',
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help="output Intel hex file")
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parser.add_argument('-p', '--preview',
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help="filename of image preview (same data as "
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"Intel hex file, as will appear on TS100 LCD)")
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parser.add_argument('-n', '--negative',
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action='store_true',
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help="photo negative: exchange black and white "
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"in output")
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parser.add_argument('-t', '--threshold',
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type=zero_to_255,
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default=128,
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help="0 to 255: gray (or color converted to gray) "
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"above this becomes white, below becomes black; "
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"ignored if using --dither")
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parser.add_argument('-d', '--dither',
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action='store_true',
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help="use dithering (speckling) to convert gray or "
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"color to black and white")
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parser.add_argument('-f', '--force',
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action='store_true',
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help="force overwriting of existing files")
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parser.add_argument('-v', '--version',
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action='version',
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version="%(prog)s version " + VERSION_STRING,
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help="print version info")
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return parser.parse_args()
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if __name__ == "__main__":
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import argparse
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args = parse_commandline()
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if os.path.exists(args.output_filename) and not args.force:
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sys.stderr.write("Won't overwrite existing file \"{}\" (use --force "
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"option to override)\n"
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.format(args.output_filename))
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sys.exit(1)
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if args.preview and os.path.exists(args.preview) and not args.force:
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sys.stderr.write("Won't overwrite existing file \"{}\" (use --force "
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"option to override)\n"
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.format(args.preview))
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sys.exit(1)
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try:
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with open(args.output_filename, 'w') as output:
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img2hex(args.input_filename,
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output,
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args.preview,
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args.threshold,
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args.dither,
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args.negative)
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except BaseException as error:
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sys.stderr.write("Error converting file: {}\n".format(error))
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sys.exit(1)
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