Gimp Script Fu Tutorial3/30/2021
Often a plug-in will work on an image, like in the case of a filter.
![]() Gimp Script Fu Tutorial How To Do ThingsEven while writing relatively simple scripts I have encountered gotchas and conflicting information about how to do things.Gimp Script Fu Tutorial Code Will SaveHopefully some of what Ive discovered scouring both the web and Python source code will save other developers the time and frustration Ive already paid. A simple Hello, World plug-in will actually demonstrate the few fundamentals common to all GIMP plug-ins written in Python. Any modern version of Python, either Python 2.7 or Python 3, should work. And as should be my standard disclaimer, I dont do or know Windows. Everything I present will usually work in a nix environment, specifically Linux or OS X. These are the directories that it scans on start up, automatically adding any plug-ins it finds. In the left hand column of the Preferences window click on the Folders entry to expand it if it isnt already and then click on Plug-Ins. ![]() You should save your custom plug-ins in your USER.gimp-2.8plug-ins directory. It is good practice and ensures that your custom plug-ins wont be overwritten during a GIMP upgrade. You will likely not be able to see it from your desktops file browser without modifying your preferences to show all hidden files and directories. Also note that you can add other directories to GIMPs plug-ins folder list. Because this file launches the Python interpreter when the plug-in is run in GIMP, it will need to be executable. The easiest way to do this is to launch a terminal and navigate to the plugin directory and run chmod x helloworld.py. For this tutorial we are going to work top down instead of bottom up, so Ill start with Python code in its entirety and explain it line by line. MIT License, 2017, Hello World,,,, helloworld, menu FiltersSamples, ) main ( ). PEP 8 tells us that it is best to avoid wildcard imports as, they make it unclear which names are present in the namespace, confusing both readers and many automated tools. ![]() In a regular plug-in, this function will likely be considerably longer and more complex. The newline character (n) at the end of our message is important in that it affects how messages are displayed. For single line messages, gimp.message displays them in the status bar at the bottom of the image window. Multi-line messages, on the other hand, are displayed in a dialog box.
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