Read and write Netpbm files
Netpbmfile is a Python library to read and write image files in the Netpbm format as specified at http://netpbm.sourceforge.net/doc/.
The following Netpbm and Portable FloatMap formats are supported:
- PBM (bi-level)
- PGM (grayscale)
- PPM (color)
- PAM (arbitrary)
- XV thumbnail (RGB332, read-only)
- Pf (float32 grayscale, read-only)
- PF (float32 RGB, read-only)
- PF4 (float32 RGBA, read-only)
- PGX (signed grayscale, read-only)
No gamma correction is performed. Only one image per file is supported.
The PGX format is specified in ITU-T Rec. T.803.
|Organization:||Laboratory for Fluorescence Dynamics, University of California, Irvine|
This release has been tested with the following requirements and dependencies (other versions may work):
- Add type hints. Support reading PF4 RGBA FloatMaps. Drop support for Python 3.7 and numpy < 1.19 (NEP29).
- Fix unclosed file warnings. Support reading PGX JPEG2000 reference images.
- Disallow comments after last value in PNM headers.
- Remove support for Python 3.6 (NEP 29). Support os.PathLike file names.
- Fix reading tightly packed P1 format and ASCII data with inline comments. Remove support for Python 2.7 and 3.5. Update copyright.
- Move netpbmfile.py into netpbmfile package.
- Support reading Portable FloatMaps. Style fixes.
- Use ‘fromdata’ classmethod to initialize from data. Support ‘with’ statement. Scale RGB images to maxval for display. Make keyword arguments explicit. Support numpy 1.10.
Save a numpy array to a Netpbm file in grayscale format:
>>> data = numpy.array([[0, 1], [65534, 65535]], dtype='uint16') >>> imwrite('_tmp.pgm', data)
Read the image data from a Netpbm file as numpy array:
>>> image = imread('_tmp.pgm') >>> assert numpy.all(image == data)
Access meta and image data in a Netpbm file:
>>> with NetpbmFile('_tmp.pgm') as pgm: ... pgm.axes ... pgm.shape ... pgm.dtype ... pgm.maxval ... pgm.magicnum ... image = pgm.asarray() 'YX' (2, 2) dtype('>u2') 65535 b'P5'
To view the image stored in a Netpbm file from a command line, run python -m netpbmfile _tmp.pgm.
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