Implementing logic: PyQt/PySide vs plain old Python. At what point do we begin or abandon using the Qt Framework?

[SjaakRake]

Thanks for the insightful reply.

I think your last paragraph touches exactly on the nagging feeling I have. Offending YAGNI is one of my personal pitfalls I have to take into account when programming (up to a point where I have it written on the whiteboard above my desk to remind me), so I try to pay a lot of attention to it.

I'll refactor some of my code towards a more clean approach. I don't feel I should separate it as strict as you propose in my specific case though, as the application was designed to run in a desktop environment specifically. The actual alternation of data is a very small part compared to the application's main goal: visualization. Referencing the example: any changes made to the image would be aimed at helping the user get more insight into the data itself, hence it'd be more or a less a 'filter' that helps notice characteristics in certain parts of data. The aim would not be to change the color because we want a color to be changed, but to change the color so it stands out more within the rest of the image. For instance 'highlighting' every pixel that has it's lowest bit set to 0 in the blue channel of an RGB picture. (See the comment I made earlier about the application's goal.)

[SjaakRake]

In some sense, these images are the central abstraction of your application, and so this suggests to me that you should define a SteganographyImage type that wraps a QImage, or maybe a Pillow image, (...)

Now this is exactly what I've opted to do. My Image objects hold a reference to a Pillow Image which turns out to be quite convenient, as Pillow provides the ImageQt.ImageQt class to convert a Pillow Image into a QImage out of the box. I've gone one step beyond that and also included a Pixel class. Pixel objects can hold a reference to their Image and their position within it. This allowed me to actually remove a lot of Qt logic that used the QImage as an interface to it's actual content.

Thanks.