TGA (AKA Truevision TGA, AKA TARGA), is a raster image file format created by Truevision. It supports up to 32 bits per pixel (three 8-bit RGB channels + 8-bit alpha channel), color mapping and optional lossless RLE compression.
This page hosts a formal specification of TGA (AKA Truevision TGA, AKA TARGA) raster image file format using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for Python generated by Kaitai Struct depends on the Python runtime library. You have to install it before you can parse data.
The Python runtime library can be installed from PyPI:
python3 -m pip install kaitaistructParse a local file and get structure in memory:
data = Tga.from_file("path/to/local/file.tga")
Or parse structure from a bytes:
from kaitaistruct import KaitaiStream, BytesIO
raw = b"\x00\x01\x02..."
data = Tga(KaitaiStream(BytesIO(raw)))
After that, one can get various attributes from the structure by invoking getter methods like:
data.num_color_map # => Number of entries in a color map
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
import kaitaistruct
from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
from enum import Enum
if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 9):
raise Exception("Incompatible Kaitai Struct Python API: 0.9 or later is required, but you have %s" % (kaitaistruct.__version__))
class Tga(KaitaiStruct):
"""TGA (AKA Truevision TGA, AKA TARGA), is a raster image file format created by Truevision. It supports up to 32 bits per pixel (three 8-bit RGB channels + 8-bit alpha channel), color mapping and optional lossless RLE compression.
.. seealso::
Source - https://www.dca.fee.unicamp.br/~martino/disciplinas/ea978/tgaffs.pdf
"""
class ColorMapEnum(Enum):
no_color_map = 0
has_color_map = 1
class ImageTypeEnum(Enum):
no_image_data = 0
uncomp_color_mapped = 1
uncomp_true_color = 2
uncomp_bw = 3
rle_color_mapped = 9
rle_true_color = 10
rle_bw = 11
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.image_id_len = self._io.read_u1()
self.color_map_type = KaitaiStream.resolve_enum(Tga.ColorMapEnum, self._io.read_u1())
self.image_type = KaitaiStream.resolve_enum(Tga.ImageTypeEnum, self._io.read_u1())
self.color_map_ofs = self._io.read_u2le()
self.num_color_map = self._io.read_u2le()
self.color_map_depth = self._io.read_u1()
self.x_offset = self._io.read_u2le()
self.y_offset = self._io.read_u2le()
self.width = self._io.read_u2le()
self.height = self._io.read_u2le()
self.image_depth = self._io.read_u1()
self.img_descriptor = self._io.read_u1()
self.image_id = self._io.read_bytes(self.image_id_len)
if self.color_map_type == Tga.ColorMapEnum.has_color_map:
self.color_map = []
for i in range(self.num_color_map):
self.color_map.append(self._io.read_bytes((self.color_map_depth + 7) // 8))
class TgaFooter(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.ext_area_ofs = self._io.read_u4le()
self.dev_dir_ofs = self._io.read_u4le()
self.version_magic = self._io.read_bytes(18)
@property
def is_valid(self):
if hasattr(self, '_m_is_valid'):
return self._m_is_valid
self._m_is_valid = self.version_magic == b"\x54\x52\x55\x45\x56\x49\x53\x49\x4F\x4E\x2D\x58\x46\x49\x4C\x45\x2E\x00"
return getattr(self, '_m_is_valid', None)
@property
def ext_area(self):
if hasattr(self, '_m_ext_area'):
return self._m_ext_area
if self.is_valid:
_pos = self._io.pos()
self._io.seek(self.ext_area_ofs)
self._m_ext_area = Tga.TgaExtArea(self._io, self, self._root)
self._io.seek(_pos)
return getattr(self, '_m_ext_area', None)
class TgaExtArea(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.ext_area_size = self._io.read_u2le()
self.author_name = (self._io.read_bytes(41)).decode(u"ASCII")
self.comments = []
for i in range(4):
self.comments.append((self._io.read_bytes(81)).decode(u"ASCII"))
self.timestamp = self._io.read_bytes(12)
self.job_id = (self._io.read_bytes(41)).decode(u"ASCII")
self.job_time = (self._io.read_bytes(6)).decode(u"ASCII")
self.software_id = (self._io.read_bytes(41)).decode(u"ASCII")
self.software_version = self._io.read_bytes(3)
self.key_color = self._io.read_u4le()
self.pixel_aspect_ratio = self._io.read_u4le()
self.gamma_value = self._io.read_u4le()
self.color_corr_ofs = self._io.read_u4le()
self.postage_stamp_ofs = self._io.read_u4le()
self.scan_line_ofs = self._io.read_u4le()
self.attributes = self._io.read_u1()
@property
def footer(self):
if hasattr(self, '_m_footer'):
return self._m_footer
_pos = self._io.pos()
self._io.seek((self._io.size() - 26))
self._m_footer = Tga.TgaFooter(self._io, self, self._root)
self._io.seek(_pos)
return getattr(self, '_m_footer', None)