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:	2022.1.14

Requirements

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

Revisions

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.

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('LayeredTiff.tif')
>>> for layer in isd.layers:
...     layer.name
...     for channel in layer.channels:
...         ch = channel.data
'Background'
'Reflect1'
'Reflect2'
'image'
'Layer 1'
'ORight'
'I'
'IShadow'
'O'

To view the layer and mask information in a layered TIFF file from a
command line, run: