As soon as I saw Gus Mueller’s offer of a free license for anyone writing a decent plug-in for Acorn, I felt moved to
exploit his generosity . So I quickly slapped together a possibly-useful filter, which ended up being a simple wrapper for a Core Image kernel (my first). Obviously that should be repackaged as an Image Unit. However, it did crash in a confusing way for a while, which is good, because it inspired me to write (most of) a test rig: a command-line tool which loads a given Acorn plug-in and runs each action it registers.
Then I started on a new plug-in, which is UI-centric and therefore can’t usefully be tested on the command line.
As such, the test rig isn’t ready, but the new plug-in is. It adds an Export… menu item to Acorn’s File menu, allowing the export of any file format supported by ImageIO – currently BMP, GIF, JPEG, JPEG 2000, OpenEXR, PDF, Photoshop, PICT, PNG, SGI, TGA and TIFF. Some of these are already supported by Acorn. But hey, some aren’t.
Plug-in and source code (MIT/X11 license) available here.