Hi!
In a python plugin I am writing for Gimp 3.0, I have created a byte array I call dest_pix that contains all the pixels of a modified image. How can I now insert this information back into an image with maximum efficiency? In Gimp 2.10 this was possible in a single python statement using dest_pix.tostring(), but not any more. Converting the byte array piecewise into a color and then using set.pixel() is impractically slow. Can anyone show me a piece of code that does this quickly? Many thanks!
Stargazy

Also, you may have noticed things have changed quite a bit in vs 3? Some people have been able to produce code but I think it is different as the inner workings of gimp have beed changed etc. Wallace picked a good helper in contrast. Also CmykStudent may be able to tell you what you can and cannot do.

I see I was called to this thread. Ok, stargazy: What is the image modification you are trying to accomplish? I can help you with by rewriting it in GEGL instead of Python.

Understand I do not work with Python instead I write GEGL syntax that can easily mimick GIMP layers and layer groups and filters. GEGL will easily allow you to recall the modified pixels in each step.

To proceed in me helping you please tell me the image modifying task you want.

Thank you all for your responses - especially contrast_ who offered direct help. I accept that programing in GEGL will do what I am asking for, but in being brief in my message meant I didn't say that I am specifically working in python to provide examples of python plug-ins for other users. It has been hard going from GIMP 2.10 to 3.0, but have workarounds for most things I wanted to do and the performance has been acceptable. But this specific issue has thwarted me. I shall continue net surfing to see if something emerges. Thanks again.