.. _howto-avm: AVM tagging =========== The latest developer version of APLpy has support for reading/writing AVM tags from/to RGB images (via `PyAVM `_). To make a plot with an AVM-tagged RGB image, say 'example.jpg', you can use:: import aplpy f = aplpy.FITSFigure('example.jpg') f.show_rgb() Note that no filename is required for :meth:`~aplpy.FITSFigure.show_rgb` in this case. If PyAVM is installed, :func:`~aplpy.make_rgb_image` can embed AVM meta-data into RGB images it creates, although only JPEG and PNG files support this:: import aplpy aplpy.make_rgb_image('2mass_cube.fits', '2mass_rgb.jpg') If PyAVM 0.9.1 or later is installed, the above file ``2mass_rgb.jpg`` will include AVM meta-data and can then be plotted with:: import aplpy f = aplpy.FITSFigure('2mass_rgb.jpg') f.show_rgb() In other words, this means that when creating an RGB image with APLpy, it is no longer necessary to initialize :class:`~aplpy.FITSFigure` with a FITS file and then use :meth:`~aplpy.FITSFigure.show_rgb` with the RGB image filename - instead, :class:`~aplpy.FITSFigure` can be directly initialized with the AVM-tagged image. To disable the embedding of AVM tags, you can use the ``embed_avm_tags=False`` option for :func:`~aplpy.make_rgb_image`. These features require `PyAVM 0.9.1 `_ or later. Please report any issues you encounter `here `_.