Image.transform data not well documented

[AlexKubiesa]

The Image.transform documentation describes the data parameter as

Extra data to the transformation method.

However, the documentation doesn't mention which data needs to be provided and in what format.

I am using perspective transform in a project and I was able to reverse engineer that a 1D numpy array of 8 floats works, but as I am lacking some of the theory behind it, it was unintuitive and I'm still not sure what the best way to generate those 8 numbers is.

[nulano]

With the exception of the perspective transform, I think the others are documented here: https://pillow.readthedocs.io/en/stable/PIL.html#module-PIL.ImageTransform
However, I agree that this is not well discoverable in the documentation.
Edit: I've created #7684 to better link to the ImageTransform module.

[AlexKubiesa]

@nulano thank you for updating it!