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Documentation for IFDRational

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wiredfool 2015-12-28 11:15:27 +00:00
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docs/handbook/image-file-formats.rst
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@ -477,10 +477,12 @@ The :py:meth:`~PIL.Image.Image.open` method sets the following
.. versionadded:: 1.1.5 .. versionadded:: 1.1.5
The :py:attr:`~PIL.Image.Image.tag_v2` attribute contains a dictionary of The :py:attr:`~PIL.Image.Image.tag_v2` attribute contains a dictionary
TIFF metadata. The keys are numerical indexes from `~PIL.TiffTags.TAGS_V2`. of TIFF metadata. The keys are numerical indexes from
Values are strings or numbers for single items, multiple values are returned `~PIL.TiffTags.TAGS_V2`. Values are strings or numbers for single
in a tuple of values. Rational numbers are returned as a single value. items, multiple values are returned in a tuple of values. Rational
numbers are returned as a :py:class:`~PIL.TiffImagePlugin.IFDRational`
object.
.. versionadded:: 3.0.0 .. versionadded:: 3.0.0
@ -510,20 +512,27 @@ The :py:meth:`~PIL.Image.Image.save` method can take the following keyword argum
.. versionadded:: 2.3.0 .. versionadded:: 2.3.0
For compatibility with legacy code, a Metadata values that are of the rational type should be passed in
`~PIL.TiffImagePlugin.ImageFileDirectory_v1` object may be passed using a :py:class:`~PIL.TiffImagePlugin.IFDRational` object.
in this field. However, this is deprecated.
..versionadded:: 3.0.0 .. versionadded:: 3.1.0
For compatibility with legacy code, a
:py:class:`~PIL.TiffImagePlugin.ImageFileDirectory_v1` object may
be passed in this field. However, this is deprecated.
.. versionadded:: 3.0.0
**compression** **compression**
A string containing the desired compression method for the A string containing the desired compression method for the
file. (valid only with libtiff installed) Valid compression file. (valid only with libtiff installed) Valid compression
methods are: ``[None, "tiff_ccitt", "group3", "group4", methods are: ``None``, ``"tiff_ccitt"``, ``"group3"``,
"tiff_jpeg", "tiff_adobe_deflate", "tiff_thunderscan", ``"group4"``, ``"tiff_jpeg"``, ``"tiff_adobe_deflate"``,
"tiff_deflate", "tiff_sgilog", "tiff_sgilog24", "tiff_raw_16"]`` ``"tiff_thunderscan"``, ``"tiff_deflate"``, ``"tiff_sgilog"``,
``"tiff_sgilog24"``, ``"tiff_raw_16"``
These arguments to set the tiff header fields are an alternative to using the general tags available through tiffinfo. These arguments to set the tiff header fields are an alternative to
using the general tags available through tiffinfo.
**description** **description**
@ -546,9 +555,10 @@ These arguments to set the tiff header fields are an alternative to using the ge
**y_resolution** **y_resolution**
**dpi** **dpi**
Either a Float, Integer, or 2 tuple of (numerator, Either a Float, 2 tuple of (numerator, denominator) or a
denominator). Resolution implies an equal x and y resolution, dpi :py:class:`~PIL.TiffImagePlugin.IFDRational`. Resolution implies
also implies a unit of inches. an equal x and y resolution, dpi also implies a unit of inches.
WebP WebP
^^^^ ^^^^