PIL Package (autodoc of remaining modules)

Reference for modules whose documentation has not yet been ported or writtencan be found here.

BdfFontFile Module

ContainerIO Module

FontFile Module

GdImageFile Module

  • class PIL.GdImageFile.GdImageFile(fp=None, filename=None)[源代码]

  • 基类：PIL.ImageFile.ImageFile

    • format = 'GD'
    • formatdescription = 'GD uncompressed images'_

GimpGradientFile Module

  • class PIL.GimpGradientFile.GradientFile[源代码]

  • 基类：object

  • PIL.GimpGradientFile.spheredecreasing(_middle, pos)[源代码]
  • PIL.GimpGradientFile.sphereincreasing(_middle, pos)[源代码]

GimpPaletteFile Module

  • class PIL.GimpPaletteFile.GimpPaletteFile(fp)[源代码]

  • 基类：object

ImageDraw2 Module

  • class PIL.ImageDraw2.Brush(color, opacity=255)[源代码]
  • 基类：object
  • class PIL.ImageDraw2.Font(color, file, size=12)[源代码]
  • 基类：object
  • class PIL.ImageDraw2.Pen(color, width=1, opacity=255)[源代码]
  • 基类：object

ImageShow Module

  • PIL.ImageShow.show(image, title=None, **options)[源代码]

ImageTransform Module

JpegPresets Module

JPEG quality settings equivalent to the Photoshop settings.

More presets can be added to the presets dict if needed.

Can be use when saving JPEG file.

To apply the preset, specify:

  1. quality="preset_name"

To apply only the quantization table:

  1. qtables="preset_name"

To apply only the subsampling setting:

  1. subsampling="preset_name"

Example:

  1. im.save("image_name.jpg", quality="web_high")

Subsampling

Subsampling is the practice of encoding images by implementing less resolutionfor chroma information than for luma information.(ref.: https://en.wikipedia.org/wiki/Chroma_subsampling)

Possible subsampling values are 0, 1 and 2 that correspond to 4:4:4, 4:2:2 and4:1:1 (or 4:2:0?).

You can get the subsampling of a JPEG with theJpegImagePlugin.get_subsampling(im) function.

Quantization tables

They are values use by the DCT (Discrete cosine transform) to removeunnecessary information from the image (the lossy part of the compression).(ref.: https://en.wikipedia.org/wiki/Quantization_matrix#Quantization_matrices,https://en.wikipedia.org/wiki/JPEG#Quantization)

You can get the quantization tables of a JPEG with:

  1. im.quantization

This will return a dict with a number of arrays. You can pass this dictdirectly as the qtables argument when saving a JPEG.

The tables format between im.quantization and quantization in presets differ in3 ways:

  • The base container of the preset is a list with sublists instead of dict.dict[0] -> list[0], dict[1] -> list[1], …
  • Each table in a preset is a list instead of an array.
  • The zigzag order is remove in the preset (needed by libjpeg >= 6a).
    You can convert the dict format to the preset format with theJpegImagePlugin.convert_dict_qtables(dict_qtables) function.

Libjpeg ref.: http://web.archive.org/web/20120328125543/http://www.jpegcameras.com/libjpeg/libjpeg-3.html

PaletteFile Module

PcfFontFile Module

PngImagePlugin.iTXt Class

Subclass of string to allow iTXt chunks to look like strings whilekeeping their extra information

  • new(cls, text, lang, tkey)

参数:

  1. - **value** – value for this key
  2. - **lang** – language code
  3. - **tkey** – UTF-8 version of the key name

PngImagePlugin.PngInfo Class

  • class PIL.PngImagePlugin.PngInfo[源代码]
  • 基类：object

PNG chunk container (for use with save(pnginfo=))

  • add(cid, data)[源代码]
  • Appends an arbitrary chunk. Use with caution.

参数:

  1. - **cid** – a byte string, 4 bytes long.
  2. - **data** – a byte string of the encoded data
  • additxt(_key, value, lang='', tkey='', zip=False)[源代码]
  • Appends an iTXt chunk.

参数:

  1. - **key** – latin-1 encodable text key name
  2. - **value** – value for this key
  3. - **lang** – language code
  4. - **tkey** – UTF-8 version of the key name
  5. - **zip** – compression flag
  • addtext(_key, value, zip=0)[源代码]
  • Appends a text chunk.

参数:

  1. - **key** – latin-1 encodable text key name
  2. - **value** – value for this key, text or an[<code>PIL.PngImagePlugin.iTXt</code>](#PIL.PngImagePlugin.iTXt) instance
  3. - **zip** – compression flag

TarIO Module

WalImageFile Module

_binary Module

  • PIL.binary.i16le(_c, o=0)[源代码]
  • Converts a 2-bytes (16 bits) string to an integer.

c: string containing bytes to converto: offset of bytes to convert in string

  • PIL.binary.i32le(_c, o=0)[源代码]
  • Converts a 4-bytes (32 bits) string to an integer.

c: string containing bytes to converto: offset of bytes to convert in string