Re: search for better regtest comparison algorithm

[Werner LEMBERG]

> Yes, I might be a moment due to friends visiting and such, but
> definitely can.

Great!

> Could you get me going pointing me to a few image pairs and an
> indication (like you did on SE) of the defect you see?

The example I gave on SE is *the* example – a small object of about
the size of a note head that appears, disappears, or is slightly moved
while the rest of the image stays the same.

> Python/NumPy/SciPy ok, yes?

For a demo, yes, of course.

> I'll pick a random version to show the concept, and then we can
> adapt to whatever dependencies lily is comfortable with.
> Importantly: is it ok to make lilypond's test suite depend on NumPy?
> It's not a small package (although it is easy and rock-solid to
> install)

Let's see what you come up with – and thanks in advance!  Python is ok
since the testing script (`output-distance.py`) is written in Python,
too.  As you say, a dependency on NumPy shouldn't be too much of a
problem, but Jonas can evaluate this better than me.


    Werner