in infrastructure/pillow-layer/python/PIL/TiffImagePlugin.py [0:0]
def _save(im, fp, filename):
try:
rawmode, prefix, photo, format, bits, extra = SAVE_INFO[im.mode]
except KeyError as e:
raise OSError(f"cannot write mode {im.mode} as TIFF") from e
ifd = ImageFileDirectory_v2(prefix=prefix)
compression = im.encoderinfo.get("compression", im.info.get("compression"))
if compression is None:
compression = "raw"
elif compression == "tiff_jpeg":
# OJPEG is obsolete, so use new-style JPEG compression instead
compression = "jpeg"
libtiff = WRITE_LIBTIFF or compression != "raw"
# required for color libtiff images
ifd[PLANAR_CONFIGURATION] = getattr(im, "_planar_configuration", 1)
ifd[IMAGEWIDTH] = im.size[0]
ifd[IMAGELENGTH] = im.size[1]
# write any arbitrary tags passed in as an ImageFileDirectory
info = im.encoderinfo.get("tiffinfo", {})
logger.debug("Tiffinfo Keys: %s" % list(info))
if isinstance(info, ImageFileDirectory_v1):
info = info.to_v2()
for key in info:
ifd[key] = info.get(key)
try:
ifd.tagtype[key] = info.tagtype[key]
except Exception:
pass # might not be an IFD. Might not have populated type
# additions written by Greg Couch, gregc@cgl.ucsf.edu
# inspired by image-sig posting from Kevin Cazabon, kcazabon@home.com
if hasattr(im, "tag_v2"):
# preserve tags from original TIFF image file
for key in (
RESOLUTION_UNIT,
X_RESOLUTION,
Y_RESOLUTION,
IPTC_NAA_CHUNK,
PHOTOSHOP_CHUNK,
XMP,
):
if key in im.tag_v2:
ifd[key] = im.tag_v2[key]
ifd.tagtype[key] = im.tag_v2.tagtype[key]
# preserve ICC profile (should also work when saving other formats
# which support profiles as TIFF) -- 2008-06-06 Florian Hoech
if "icc_profile" in im.info:
ifd[ICCPROFILE] = im.info["icc_profile"]
for key, name in [
(IMAGEDESCRIPTION, "description"),
(X_RESOLUTION, "resolution"),
(Y_RESOLUTION, "resolution"),
(X_RESOLUTION, "x_resolution"),
(Y_RESOLUTION, "y_resolution"),
(RESOLUTION_UNIT, "resolution_unit"),
(SOFTWARE, "software"),
(DATE_TIME, "date_time"),
(ARTIST, "artist"),
(COPYRIGHT, "copyright"),
]:
if name in im.encoderinfo:
ifd[key] = im.encoderinfo[name]
dpi = im.encoderinfo.get("dpi")
if dpi:
ifd[RESOLUTION_UNIT] = 2
ifd[X_RESOLUTION] = int(dpi[0] + 0.5)
ifd[Y_RESOLUTION] = int(dpi[1] + 0.5)
if bits != (1,):
ifd[BITSPERSAMPLE] = bits
if len(bits) != 1:
ifd[SAMPLESPERPIXEL] = len(bits)
if extra is not None:
ifd[EXTRASAMPLES] = extra
if format != 1:
ifd[SAMPLEFORMAT] = format
ifd[PHOTOMETRIC_INTERPRETATION] = photo
if im.mode in ["P", "PA"]:
lut = im.im.getpalette("RGB", "RGB;L")
ifd[COLORMAP] = tuple(i8(v) * 256 for v in lut)
# data orientation
stride = len(bits) * ((im.size[0] * bits[0] + 7) // 8)
ifd[ROWSPERSTRIP] = im.size[1]
strip_byte_counts = stride * im.size[1]
if strip_byte_counts >= 2 ** 16:
ifd.tagtype[STRIPBYTECOUNTS] = TiffTags.LONG
ifd[STRIPBYTECOUNTS] = strip_byte_counts
ifd[STRIPOFFSETS] = 0 # this is adjusted by IFD writer
# no compression by default:
ifd[COMPRESSION] = COMPRESSION_INFO_REV.get(compression, 1)
if libtiff:
if "quality" in im.encoderinfo:
quality = im.encoderinfo["quality"]
if not isinstance(quality, int) or quality < 0 or quality > 100:
raise ValueError("Invalid quality setting")
if compression != "jpeg":
raise ValueError(
"quality setting only supported for 'jpeg' compression"
)
ifd[JPEGQUALITY] = quality
logger.debug("Saving using libtiff encoder")
logger.debug("Items: %s" % sorted(ifd.items()))
_fp = 0
if hasattr(fp, "fileno"):
try:
fp.seek(0)
_fp = os.dup(fp.fileno())
except io.UnsupportedOperation:
pass
# optional types for non core tags
types = {}
# SAMPLEFORMAT is determined by the image format and should not be copied
# from legacy_ifd.
# STRIPOFFSETS and STRIPBYTECOUNTS are added by the library
# based on the data in the strip.
# The other tags expect arrays with a certain length (fixed or depending on
# BITSPERSAMPLE, etc), passing arrays with a different length will result in
# segfaults. Block these tags until we add extra validation.
blocklist = [
REFERENCEBLACKWHITE,
SAMPLEFORMAT,
STRIPBYTECOUNTS,
STRIPOFFSETS,
TRANSFERFUNCTION,
]
atts = {}
# bits per sample is a single short in the tiff directory, not a list.
atts[BITSPERSAMPLE] = bits[0]
# Merge the ones that we have with (optional) more bits from
# the original file, e.g x,y resolution so that we can
# save(load('')) == original file.
legacy_ifd = {}
if hasattr(im, "tag"):
legacy_ifd = im.tag.to_v2()
for tag, value in itertools.chain(
ifd.items(), getattr(im, "tag_v2", {}).items(), legacy_ifd.items()
):
# Libtiff can only process certain core items without adding
# them to the custom dictionary.
# Custom items are supported for int, float, unicode, string and byte
# values. Other types and tuples require a tagtype.
if tag not in TiffTags.LIBTIFF_CORE:
if not Image.core.libtiff_support_custom_tags:
continue
if tag in ifd.tagtype:
types[tag] = ifd.tagtype[tag]
elif not (isinstance(value, (int, float, str, bytes))):
continue
else:
type = TiffTags.lookup(tag).type
if type:
types[tag] = type
if tag not in atts and tag not in blocklist:
if isinstance(value, str):
atts[tag] = value.encode("ascii", "replace") + b"\0"
elif isinstance(value, IFDRational):
atts[tag] = float(value)
else:
atts[tag] = value
logger.debug("Converted items: %s" % sorted(atts.items()))
# libtiff always expects the bytes in native order.
# we're storing image byte order. So, if the rawmode
# contains I;16, we need to convert from native to image
# byte order.
if im.mode in ("I;16B", "I;16"):
rawmode = "I;16N"
# Pass tags as sorted list so that the tags are set in a fixed order.
# This is required by libtiff for some tags. For example, the JPEGQUALITY
# pseudo tag requires that the COMPRESS tag was already set.
tags = list(atts.items())
tags.sort()
a = (rawmode, compression, _fp, filename, tags, types)
e = Image._getencoder(im.mode, "libtiff", a, im.encoderconfig)
e.setimage(im.im, (0, 0) + im.size)
while True:
# undone, change to self.decodermaxblock:
l, s, d = e.encode(16 * 1024)
if not _fp:
fp.write(d)
if s:
break
if s < 0:
raise OSError(f"encoder error {s} when writing image file")
else:
offset = ifd.save(fp)
ImageFile._save(
im, fp, [("raw", (0, 0) + im.size, offset, (rawmode, stride, 1))]
)
# -- helper for multi-page save --
if "_debug_multipage" in im.encoderinfo:
# just to access o32 and o16 (using correct byte order)
im._debug_multipage = ifd