psdtags 2022.2.11

Read and write layered TIFF ImageSourceData and ImageResources tags

Psdtags is a Python library to read and write the Adobe Photoshop(r) specific ImageResources (#34377) and ImageSourceData (#37724) TIFF tags, which contain image resource blocks, layer and mask information found in a typical layered TIFF file created by Photoshop.

The format is specified in the Adobe Photoshop TIFF Technical Notes (March 22, 2002) and Adobe Photoshop File Formats Specification (November 2019).

Adobe Photoshop is a registered trademark of Adobe Systems Inc.

Author:

Christoph Gohlke

Organization:

Laboratory for Fluorescence Dynamics, University of California, Irvine

License:

BSD 3-Clause

Version:

2022.2.11

Status:

Alpha

Requirements

This release has been tested with the following requirements and dependencies (other versions may work):

• CPython 3.8.10, 3.9.10, 3.10.2 64-bit

• Numpy 1.21.5

• Imagecodecs 2021.11.20 (optional)

• Tifffile 2022.2.9 (optional)

• Matplotlib 3.4.3 (optional)

Revisions

2022.2.11

Fix struct padding. Support TiffImageResources.

2022.2.2

Various API changes (breaking). Handle additional layer information. Preserve structures of unknown format as opaque bytes. Add options to skip tag structures of unknown format. Add abstract base class for tag structures. Add classes for many structures.

2022.1.18

Various API changes (breaking). Various fixes for writing TiffImageSourceData. Support filter masks. Add option to change channel compression on write. Warn when skipping ResourceKey sections.

2022.1.14

Initial release.

Notes

The API is not stable yet and might change between revisions.

This module has been tested with a limited number of files only.

Additional layer information is not yet supported.

Consider psd-tools and pytoshop for working with Adobe Photoshop PSD files.

Examples

Read the ImageSourceData tag value from a layered TIFF file and iterate over all the channels:

>>> isd = TiffImageSourceData.fromtiff('layered.tif')
>>> for layer in isd.layers:
...     layer.name
...     for channel in layer.channels:
...         ch = channel.data  # a numpy array
'Background'
'Reflect1'
'Reflect2'
'image'
'Layer 1'
'ORight'
'I'
'IShadow'
'O'

Read the ImageResources tag value from the TIFF file, iterate over the blocks, and get the thumbnail image:

>>> res = TiffImageResources.fromtiff('layered.tif')
>>> for block in res.blocks:
...     blockname = block.name
>>> res.thumbnail().shape
(90, 160, 3)

Write the image, ImageSourceData and ImageResources to a new layered TIFF file:

>>> from tifffile import imread, imwrite
>>> image = imread('layered.tif')
>>> imwrite(
...     '_layered.tif',
...     image,
...     byteorder=isd.byteorder,  # must match ImageSourceData
...     photometric='rgb',  # must match ImageSourceData
...     metadata=None,  # do not write any tifffile specific metadata
...     extratags=[isd.tifftag(), res.tifftag()],
... )

Verify that the new layered TIFF file contains readable ImageSourceData:

>>> assert isd == TiffImageSourceData.fromtiff('_layered.tif')
>>> assert res == TiffImageResources.fromtiff('_layered.tif')

To view the layer and mask information as well as the image resource blocks in a layered TIFF file from a command line, run:

python -m psdtags layered.tif