This is an example of processing data of the Andromeda Galaxy, with Astro Pixel Processor. The data was obtained from the Internet, rather than captured with my equipment (cloudy and windy the last few nights).
Here is the link to the raw data:
There are some other targets available there, I’ve seen some other processed data and the nebulae are quite astonishing.
An issue I have with using practice data, is that often the data is just too perfect, otherwise it won’t have found its way on to the Internet. It sometimes is more instructive to try and process bad data and make something good of it rather than process just good data.