ImageFile Module

The ImageFile module provides support functions for the image open and save functions.

In addition, it provides a Parser class which can be used to decode an image piece by piece (e.g. while receiving it over a network connection). This class implements the same consumer interface as the standard sgmllib and xmllib modules.

Example: Parse an image

from PIL import ImageFile

fp = open("hopper.pgm", "rb")

p = ImageFile.Parser()

while 1:
    s = fp.read(1024)
    if not s:
        break
    p.feed(s)

im = p.close()

im.save("copy.jpg")

Classes

class PIL.ImageFile.Parser

Incremental image parser. This class implements the standard feed/close consumer interface.

close()

(Consumer) Close the stream.

Returns

An image object.

Raises

OSError – If the parser failed to parse the image file either because it cannot be identified or cannot be decoded.

feed(data)

(Consumer) Feed data to the parser.

Parameters

data – A string buffer.

Raises

OSError – If the parser failed to parse the image file.

reset()

(Consumer) Reset the parser. Note that you can only call this method immediately after you’ve created a parser; parser instances cannot be reused.

class PIL.ImageFile.PyDecoder

Python implementation of a format decoder. Override this class and add the decoding logic in the decode() method.

See Writing Your Own File Decoder in Python

cleanup()

Override to perform decoder specific cleanup

Returns

None

decode(buffer)

Override to perform the decoding process.

Parameters

buffer – A bytes object with the data to be decoded.

Returns

A tuple of (bytes consumed, errcode). If finished with decoding return <0 for the bytes consumed. Err codes are from ImageFile.ERRORS.

init(args)

Override to perform decoder specific initialization

Parameters

args – Array of args items from the tile entry

Returns

None

set_as_raw(data, rawmode=None)

Convenience method to set the internal image from a stream of raw data

Parameters

• data – Bytes to be set

• rawmode – The rawmode to be used for the decoder. If not specified, it will default to the mode of the image

Returns

None

setfd(fd)

Called from ImageFile to set the python file-like object

Parameters

fd – A python file-like object

Returns

None

setimage(im, extents=None)

Called from ImageFile to set the core output image for the decoder

Parameters

• im – A core image object

• extents – a 4 tuple of (x0, y0, x1, y1) defining the rectangle for this tile

Returns

None

class PIL.ImageFile.ImageFile

Bases: PIL.Image.Image

Base class for image file format handlers.

tile

A list of tile descriptors, or None

get_format_mimetype()

verify()

Check file integrity

load()

Load image data based on tile list

load_prepare()

load_end()

class PIL.ImageFile.StubImageFile

Bases: PIL.ImageFile.ImageFile

Base class for stub image loaders.

A stub loader is an image loader that can identify files of a certain format, but relies on external code to load the file.

load()

Load image data based on tile list

Constants

PIL.ImageFile.LOAD_TRUNCATED_IMAGES = False

Whether or not to load truncated image files. User code may change this.

PIL.ImageFile.ERRORS

Dict of known error codes returned from PyDecoder.decode().