Tileset/tile2360.py
< Tileset
This page contains a program that is meant to be downloaded and run on the user's computer. Editing is limited to logged-in users to discourage introduction of malicious code.
Here is a Python program that will take a NetHack 3.4.3 tileset in BMP format and convert it to a form usable with 3.6.0.
If you have a Mac or Linux, you probably already have Python (or can install it with your package manager). Windows users can run this with ActiveState Python.
Use ./tile2360.py -h for a complete list of options. Most tilesets convert without needing any options; the program assumes that the image contains 40 tiles per row and that tiles are square, unless the tile size is given. The output file name just adds "-360" before the ".bmp" suffix, unless the command line specifies a different name.
New tiles are created as follows:
- Monster tiles are converted to grayscale to form statue tiles. To give better results with tilesets that do not use black backgrounds, the tile is compared to the floor tile; a pixel that is different from the floor is converted.
- The number of scroll appearances increases from 25 to 41; tile2360.py repeats the first 16 scroll tiles to make 41.
- The tile for the darkened portion of a floor is created by halving the luminance of the existing floor tile.
- Eight other tiles are filled in with a placeholder, which appears as a solid red tile with a black X through it. This is for use by tileset authors, who can then fill in the missing tiles. The missing tiles are, in order:
- glob of gray ooze, brown pudding, green slime and black pudding, in that order; this is a block of four missing tiles appearing after the meat ring
- novel -- this is a single missing tile appearing after all the spellbooks except the Book of the Dead
- The vibrating square -- this is a single missing tile appearing after all the traps
- Poison cloud and valid position -- these are two missing tiles appearing after the sparkles
#!/usr/bin/env python
# tile2360.py -- convert NetHack 3.4.3 tile sets most of the way to 3.6.0
#
# Copyright (c) 2015, 2026, Ray Chason
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import argparse
import os.path
import struct
import sys
# A Bitmap image, with some extra methods for tile mapping
class Bitmap(object):
def __init__(self, inpname):
# TODO: This assumes the BITMAPINFOHEADER structure. Add support for
# other bitmap formats.
# Read the header
fp = open(inpname, "rb")
header = fp.read(54)
(magic,
self.bmp_size,
reserved,
self.image_offset,
self.header_size,
self.width,
self.height,
self.num_planes,
self.bits_per_pixel,
self.compression,
self.image_size,
self.horiz_res,
self.vert_res,
self.num_colors,
self.num_important_colors) = struct.unpack("<2s6L2H6L", header)
# Check various header fields for unsupported stuff
if magic != b"BM":
raise RuntimeError("%s is not in .BMP format" % inpname)
if self.header_size != 40:
raise RuntimeError("%s has an unsupported header type (%d)" % \
(inpname, self.header_size))
if self.num_planes != 1:
raise RuntimeError("%s has %d planes, not supported" % \
(inpname, self.num_planes))
if self.compression != 0:
raise RuntimeError("%s is compressed (%d), and not supported" % \
(inpname, self.compression))
if self.bits_per_pixel not in (1, 2, 4, 8, 24, 32):
raise RuntimeError("%s has %d bits per pixel, not supported" % \
(inpname, self.bits_per_pixel))
# Read the palette
if self.bits_per_pixel <= 8:
if self.num_colors == 0:
self.num_colors = 1 << self.bits_per_pixel
self.palette = [ None ] * self.num_colors
for i in range(0, self.num_colors):
b, g, r, z = struct.unpack("<4B", fp.read(4))
self.palette[i] = (b, g, r)
else:
self.palette = None
# Read the pixels
fp.seek(self.image_offset)
self.image = [ None ] * self.height
row_size = ((self.bits_per_pixel * self.width + 31) // 32) * 4
if self.bits_per_pixel <= 8:
# Palettized image; convert to 24 bit
pixels_per_byte = 8 // self.bits_per_pixel
mask = (1 << self.bits_per_pixel) - 1
for y in range(0, self.height):
row_bytes = fp.read(row_size)
row_bytes = list(map(
lambda x : struct.unpack('<1B', bytearray([x]))[0],
row_bytes))
row = [ None ] * self.width
self.image[self.height - 1 - y] = row
shift = 8
for x in range(0, self.width):
if shift <= 0:
shift = 8
shift -= self.bits_per_pixel
x_hi = x // pixels_per_byte
i = (row_bytes[x_hi] >> shift) & mask
row[x] = self.palette[i]
else:
# 24 or 32 bits per pixel
bytes_per_pixel = self.bits_per_pixel // 8
for y in range(0, self.height):
row_bytes = fp.read(row_size)
row_bytes = map(
lambda x : struct.unpack('<1B', x)[0],
row_bytes)
row = [ None ] * self.width
self.image[self.height - 1 - y] = row
for x in range(0, self.width):
x2 = x * bytes_per_pixel
row[x] = tuple(row_bytes[x2 : x2 + 3])
self.bits_per_pixel = 24
# These are yet unknown
self.tile_width = None
self.tile_height = None
self.tiles_per_row = None
self.tile_rows = None
self.tiles = None
# Split the image into tiles
def split(self, tile_width, tile_height):
self.tile_width = tile_width
self.tile_height = tile_height
self.tiles_per_row = self.width // tile_width
self.tile_rows = self.height // tile_height
num_tiles = self.tiles_per_row * self.tile_rows
self.tiles = [ None ] * num_tiles
for t in range(0, num_tiles):
tile = [ None ] * tile_height
self.tiles[t] = tile
t_col = t % self.tiles_per_row
t_row = t // self.tiles_per_row
t_x = t_col * tile_width
t_y = t_row * tile_height
for y in range(0, tile_height):
tile[y] = self.image[t_y + y][t_x : t_x + tile_width]
# Rearrange the tiles to match the NetHack 3.6.0 order
def remap(self, no_statues):
# If tile_map[X] = Y, the tile in position X for 3.6.0 comes from
# position Y for 3.4.3. Negative numbers indicate tiles that cannot
# be directly mapped.
tile_map = [
# Monsters
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16,
# dingo (19) placed before dog (17)
19, 17, 18,
20, 21,
# winter wolf cub (23) placed before warg (22)
23, 22,
24, 25, 26, 27, 28, 29,
30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
90, 91, 92, 93, 94, 95, 96, 97, 98, 99,
100,
# pony (104) placed before white unicorn (101)
104, 101, 102, 103,
105, 106, 107, 108, 109,
110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127, 128, 129,
130, 131, 132, 133, 134, 135, 136, 137, 138, 139,
140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
160, 161, 162, 163, 164, 165, 166, 167, 168, 169,
170, 171, 172, 173, 174,
# ettin (176) placed before storm giant (175)
176, 175,
177, 178, 179,
180, 181, 182, 183, 184, 185, 186, 187, 188, 189,
190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
200, 201, 202, 203, 204, 205, 206, 207, 208, 209,
# green slime (211) placed before black pudding (210)
211, 210,
212, 213, 214, 215, 216, 217,
# python (219) placed before pit viper (218)
219, 218,
220, 221, 222, 223, 224, 225, 226, 227, 228, 229,
230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247,
# ghoul (249) placed before giant zombie (248)
249, 248,
250, 251, 252, 253, 254, 255, 256, 257, 258, 259,
260, 261, 262, 263, 264, 265, 266, 267, 268, 269,
270, 271, 272,
# nurse (273) placed after sergeant (281)
274, 275, 276, 277, 278, 279, 280, 281, 273,
282, 283, 284, 285, 286, 287, 288, 289,
290, 291, 292,
# succubus (294) placed before horned devil (293)
294, 293,
295, 296, 297, 298, 299,
300, 301, 302, 303, 304,
# sandestin (319) placed before balrog (305)
319, 305, 306, 307, 308, 309, 310, 311, 312, 313,
314, 315, 316, 317, 318,
320, 321, 322, 323, 324, 325, 326, 327, 328, 329,
330, 331, 332, 333, 334, 335, 336, 337, 338, 339,
340, 341, 342, 343, 344, 345, 346, 347, 348, 349,
350, 351, 352, 353, 354, 355, 356, 357, 358, 359,
360, 361, 362, 363, 364, 365, 366, 367, 368, 369,
370, 371, 372, 373, 374, 375, 376, 377, 378, 379,
380, 381, 382, 383, 384, 385, 386, 387, 388, 389,
390, 391, 392, 393,
# Objects:
394, 395, 396, 397, 398, 399,
400, 401, 402, 403, 404, 405, 406, 407, 408, 409,
410, 411, 412, 413, 414, 415, 416, 417, 418, 419,
420, 421, 422, 423, 424, 425, 426, 427, 428, 429,
430, 431, 432, 433, 434, 435, 436, 437, 438, 439,
440, 441, 442, 443, 444, 445, 446, 447, 448, 449,
450, 451, 452, 453, 454, 455, 456, 457, 458, 459,
460, 461, 462, 463, 464, 465, 466, 467, 468, 469,
470, 471, 472, 473, 474, 475, 476, 477, 478, 479,
480, 481, 482, 483, 484, 485, 486, 487, 488, 489,
490, 491, 492, 493, 494, 495, 496, 497, 498, 499,
500, 501, 502, 503, 504, 505, 506, 507, 508, 509,
510, 511, 512, 513, 514, 515, 516, 517, 518, 519,
520, 521, 522, 523, 524, 525, 526, 527, 528, 529,
530, 531, 532, 533, 534, 535, 536, 537, 538, 539,
540, 541, 542, 543, 544, 545, 546, 547, 548, 549,
550, 551, 552, 553, 554, 555, 556, 557, 558, 559,
560, 561, 562, 563, 564, 565, 566, 567, 568, 569,
570, 571, 572, 573, 574, 575, 576, 577, 578, 579,
580, 581, 582, 583, 584, 585, 586, 587, 588, 589,
590, 591, 592, 593, 594, 595, 596, 597, 598, 599,
600, 601, 602, 603, 604, 605, 606, 607, 608, 609,
610, 611, 612, 613, 614, 615, 616, 617, 618, 619,
620, 621, 622, 623, 624, 625, 626, 627, 628, 629,
630, 631, 632, 633, 634, 635, 636, 637, 638, 639,
640, 641,
-1, # glob of gray ooze
-1, # glob of brown pudding
-1, # glob of green slime
-1, # glob of black pudding
642, 643, 644, 645, 646, 647, 648, 649,
650, 651, 652, 653, 654, 655, 656, 657, 658, 659,
660, 661, 662, 663, 664, 665, 666, 667, 668, 669,
670, 671, 672, 673, 674, 675, 676, 677, 678, 679,
680, 681, 682, 683, 684, 685, 686, 687, 688, 689,
# Random scroll appearances begin here
690, 691, 692, 693, 694, 695, 696, 697, 698, 699,
700, 701, 702, 703, 704, 705, 706, 707, 708, 709,
710, 711, 712, 713, 714,
# New random scroll appearances. Repeat the first 16 above
690, 691, 692, 693, 694, 695, 696, 697, 698, 699,
700, 701, 702, 703, 704, 705,
# Random scroll appearances end here
715, 716, 717, 718, 719,
720, 721, 722, 723, 724, 725, 726, 727, 728, 729,
730, 731, 732, 733, 734, 735, 736, 737, 738, 739,
740, 741, 742, 743, 744, 745, 746, 747, 748, 749,
750, 751, 752, 753, 754, 755, 756, 757,
-1, # Novel
758, 759,
760, 761, 762, 763, 764, 765, 766, 767, 768, 769,
770, 771, 772, 773, 774, 775, 776, 777, 778, 779,
780, 781, 782, 783, 784, 785, 786, 787, 788, 789,
790, 791, 792, 793, 794, 795, 796, 797, 798, 799,
800, 801, 802, 803, 804, 805, 806, 807, 808, 809,
810, 811, 812, 813, 814, 815, 816, 817, 818, 819,
820, 821, 822, 823, 824, 825, 826, 827, 828,
# Dungeon features, missiles, explosions, etc.
829,
830, 831, 832, 833, 834, 835, 836, 837, 838, 839,
840, 841, 842, 843, 844, 845, 846, 847, 848,
-2, # darkened part of a room
849,
850, 851, 852, 853, 854, 855, 856, 857, 858, 859,
860, 861, 862, 863, 864, 865, 866, 867, 868, 869,
870, 871, 872, 873, 874, 875, 876, 877, 878, 879,
880, 881, 882, 883, 884, 885, 886, 887, 888, 889,
890, 891,
-1, # vibrating square
892, 893, 894, 895, 896, 897, 898, 899,
900, 901, 902, 903,
-1, # poison cloud
-1, # valid position
904, 905, 906, 907, 908, 909,
910, 911, 912, 913, 914, 915, 916, 917, 918, 919,
920, 921, 922, 923, 924, 925, 926, 927, 928, 929,
930, 931, 932, 933, 934, 935, 936, 937, 938, 939,
940, 941, 942, 943, 944, 945, 946, 947, 948, 949,
950, 951, 952, 953, 954, 955, 956, 957, 958, 959,
960, 961, 962, 963, 964, 965, 966, 967, 968, 969,
970, 971, 972, 973, 974, 975, 976, 977, 978, 979,
980, 981, 982, 983, 984, 985, 986, 987, 988, 989,
990, 991, 992, 993, 994, 995, 996, 997, 998, 999,
1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009,
1010, 1011, 1012, 1013, 1014, 1015, 1016, 1017, 1018, 1019,
1020, 1021, 1022, 1023, 1024, 1025, 1026, 1027, 1028, 1029,
1030, 1031, 1032, 1033, 1034, 1035, 1036, 1037, 1038, 1039,
1040, 1041, 1042, 1043, 1044, 1045, 1046, 1047, 1048, 1049,
1050, 1051, 1052, 1053, 1054, 1055, 1056
# then repeat the monster glyphs to make statues
]
# Map monsters, objects and dungeon features
map_size = len(tile_map)
new_tiles = [ None ] * (map_size + 394)
for i in range(0, map_size):
m = tile_map[i]
if m >= 0:
new_tiles[i] = self.tiles[m]
elif m == -2:
new_tiles[i] = self.darkenedTile(self.tiles[m - 1])
else:
new_tiles[i] = self.placeHolderTile()
# Generate statue tiles
if no_statues:
for i in range(0, 394):
new_tiles[i + map_size] = self.tiles[824] # statue
else:
for i in range(0, 394):
new_tiles[i + map_size] = self.makeStatue(
new_tiles[i], self.tiles[848])
# Update the number of tile rows
self.tile_rows = (len(new_tiles) + self.tiles_per_row - 1) \
// self.tiles_per_row
# Add some blank tiles to fill out the last row
num_tiles = self.tile_rows * self.tiles_per_row
if len(new_tiles) < num_tiles:
blank_tile = self.blankTile()
while len(new_tiles) < num_tiles:
new_tiles.append(blank_tile)
self.tiles = new_tiles
# Rejoin the tiles into a new image
def join(self):
# New image dimensions; normally width will be unchanged
self.width = self.tiles_per_row * self.tile_width
self.height = self.tile_rows * self.tile_height
# Create blank image
self.image = [ None ] * self.height
for i in range(0, self.height):
self.image[i] = []
# Add each tile to the end of its row
for i in range(0, len(self.tiles)):
t_row = i // self.tiles_per_row
t_y = t_row * self.tile_height
tile = self.tiles[i]
for j in range(0, self.tile_height):
self.image[t_y + j].extend(tile[j])
# Write the image to the output file
def write(self, outname):
fp = open(outname, "wb")
# Write a palettized image if possible without degradation
self.buildPalette()
palette_map = {}
if self.bits_per_pixel <= 8:
for i in range(0, len(self.palette)):
palette_map[self.palette[i]] = i
# Write the header, with placeholders for some fields
self.writeHeader(fp)
# Write the palette if any
if self.bits_per_pixel <= 8:
for i in range(0, self.num_colors):
fp.write(struct.pack("<4B",
self.palette[i][0],
self.palette[i][1],
self.palette[i][2],
0))
self.image_offset = fp.tell()
# Write the pixels
row_size = ((self.bits_per_pixel * self.width + 31) // 32) * 4
if self.bits_per_pixel <= 8:
for y in range(0, self.height):
row = self.image[self.height - 1 - y]
bits = 0
byte = 0
count = 0
for x in range(0, self.width):
index = palette_map[row[x]]
byte = (byte << self.bits_per_pixel) | index
bits += self.bits_per_pixel
if bits >= 8:
fp.write(struct.pack("<1B", byte))
byte = 0
bits = 0
count += 1
if bits != 0:
byte <<= 8 - bits
fp.write(struct.pack("<1B", byte))
count += 1
while count < row_size:
fp.write(struct.pack("<1B", 0))
count += 1
else:
for y in range(0, self.height):
row = self.image[self.height - 1 - y]
for x in range(0, self.width):
for byte in row[x]:
fp.write(struct.pack("<1B", byte))
count = len(row) * len(row[0])
while count < row_size:
fp.write(struct.pack("<1B", 0))
count += 1
# Write the header with the correct offsets
self.bmp_size = fp.tell()
fp.seek(0)
self.writeHeader(fp)
# Given the existing image, build a palette if possible
# If there are more than 256 unique colors, build no palette; we will
# write a 24 bit bitmap
def buildPalette(self):
# Collect all colors present in the image
color_count = {}
for row in self.image:
for pixel in row:
if pixel not in color_count:
color_count[pixel] = 0
color_count[pixel] += 1
# Get the list of unique colors; this will be the palette
palette = list(color_count.keys())
self.num_colors = len(palette)
if self.num_colors > 256:
# We will write a 24 bit bitmap
self.bits_per_pixel = 24
self.palette = None
return
# Arrange in descending order of occurrence
palette.sort(key=lambda a : -color_count[a])
# Set a valid bit-per-pixel count, with the fewest bits that will
# encompass the palette
self.palette = palette
if self.num_colors < 2:
self.bits_per_pixel = 1
elif self.num_colors < 4:
self.bits_per_pixel = 2
elif self.num_colors < 16:
self.bits_per_pixel = 4
else:
self.bits_per_pixel = 8
# A black tile, to fill the last row
def blankTile(self):
return [ [ (0, 0, 0) ] * self.tile_width ] * self.tile_height
# A placeholder tile, for the tiles that cannot otherwise be derived
# This will appear as a red block with a black X through it
def placeHolderTile(self):
red = ( 0x00, 0x00, 0xFF )
black = ( 0x00, 0x00, 0x00 )
tile = [ None ] * self.tile_height
for y in range(0, self.tile_height):
tile[y] = [ red ] * self.tile_width
m = min(self.tile_width, self.tile_height)
for x in range(0, m):
tile[x][x] = black
tile[x][m - 1 - x] = black
return tile
# A tile at half brightness to the input
def darkenedTile(self, inptile):
outtile = [ None ] * len(inptile)
for y in range(0, len(outtile)):
inprow = inptile[y]
outrow = [ None ] * len(inprow)
outtile[y] = outrow
for x in range(0, len(inprow)):
inp = inprow[x]
out = ( inp[0] >> 1, inp[1] >> 1, inp[2] >> 1 )
outrow[x] = out
return outtile
# A statue tile.
# To assist in transforming tile sets that do not use a black background,
# this accepts the floor tile. A pixel that is different from the floor
# tile is considered to be foreground, and converted to grayscale.
def makeStatue(self, inptile, floor):
outtile = [ None ] * len(inptile)
for y in range(0, len(outtile)):
inprow = inptile[y]
floor_row = floor[y]
outrow = [ None ] * len(inprow)
outtile[y] = outrow
for x in range(0, len(inprow)):
inp = inprow[x]
fl = floor_row[x]
if inp == fl:
# background
out = inp
else:
# foreground
gray = (inp[0] + inp[1] + inp[2]) // 3
out = ( gray, gray, gray )
outrow[x] = out
return outtile
# Write a BITMAPINFOHEADER-type header for a BMP file
def writeHeader(self, fp):
fp.write(struct.pack("<2s6L2H6L",
b"BM",
self.bmp_size,
0,
self.image_offset,
self.header_size,
self.width,
self.height,
self.num_planes,
self.bits_per_pixel,
self.compression,
self.image_size,
self.horiz_res,
self.vert_res,
self.num_colors,
self.num_important_colors))
# Convert one bitmap file
# inpname is the name of the file to be converted; args contains the arguments
# as parsed by the ArgumentParser object
def convertBitmap(inpname, args):
# Collect arguments from args
tile_width = args.tile_width
tile_height = args.tile_height
no_statues = args.no_statues
outname = args.output
# Provide default output file name
if outname is None:
d, n = os.path.split(inpname)
dot = n.rfind('.')
if dot != -1:
n = n[:dot]
n += '-360.bmp'
outname = os.path.join(d, n)
# Read the bitmap image
bmp = Bitmap(inpname)
# Provide default tile dimensions
if tile_width is None:
tile_width = bmp.width // 40
if tile_height is None:
tile_height = tile_width
# Split the bitmap into tiles
bmp.split(tile_width, tile_height)
# Remap into 3.6.0 arrangement
bmp.remap(no_statues)
# Rejoin into a single image
bmp.join()
# Write to disk
bmp.write(outname)
# Define command line arguments for this program
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description='Convert NetHack 3.4.3 tile sets for use with 3.6.0',
epilog="""
If --tile-width is not specified, it is the image width divided by 40.
If --tile-height is not specified, it is equal to the tile width.
If --no-statues is specified, statue glyphs are copied from the 3.4.3 statue
glyph; if not, statue glyphs are generated by converting the monster glyphs
to grayscale.
Images must be in BMP format.
If --output is not specified, the output file name is <input-name>-360.bmp.
Multiple images can be converted, but only if --output is not specified.
""")
parser.add_argument('images', metavar='image', type=str, nargs='+',
help='Name of a tile set image for NetHack 3.4.3')
parser.add_argument('--tile-width', '-x', dest='tile_width', type=int,
help='Width of a single tile in pixels')
parser.add_argument('--tile-height', '-y', dest='tile_height', type=int,
help='Height of a single tile in pixels')
parser.add_argument('--no-statues', '-s', dest='no_statues',
action='store_true',
help='Do not derive statues from monsters')
parser.add_argument('--output', '-o', dest='output', type=str,
help='Name of output image')
args = parser.parse_args()
if len(args.images) > 1 and args.output is not None:
sys.stderr.write("Cannot specify --output with more than one image name\n")
sys.exit(1)
# Process each image in turn
rc = 0
for image in args.images:
if not convertBitmap(image, args):
rc = 1
sys.exit(rc)