OK - so colour correction and antighost interact and are in some way mutually dependent? So that if colour correction is not set/working properly then antighost will fail. Is that a corrcet imterpreration of you comments?
That was always the case even with 2.0 series, but don't misunderstand me. There is a relation because of the following fact :
Imagine a pure light blue sky in one image and a dark pure blue sky in a second image. These images are overlapping. For the antighost system, it will find that there is a ghost between both images because of the difference of color.
It's exactly the same with this case. The wrong color correction probably changed the decision taken by anti-ghost ( because the ground on one image what light grey and on the second dark grey. Perhaps one moving people was having the same color as the ground of the second image, etc ).
It's about pixels, not about enabled / disabled color correction. In the following case, I just disabled color correction because it was not needed. And it worked directly. In a really badly exposed panorama, you will need to make color correction to help anti-ghost to work better.
I assumed that the default colour correction settings would be most appropriate for most panos? Perhaps not?
How did my colour settings become 'really wrong' when I was using the defaults? Are the defaults set incorrectly? Have I inadvertently changed the defaults without having been aware of doing so?
I still have to check that (issue 390, btw)
What colour correction should I have set to get this scene to stitch properly as you have done?
No color correction.
Does one have to change the sdetting for colour correction depending on some pre-stitch assessment of the image set? If so, how? What are the rules/metrics one should employ to ensure reliable results?
No. Most of the time, you don't need to cope with that. We are in a theorical case here : how to make anti-ghost work when color are obviously wrong ?
So just check color correction ( by disabling or changing anchor type ) and everything fine.
How do all those possible colour correction settings relate to None/LDR/HDR? That system I more or less understood, or rather I became familiar with how it behaved. This new system I find quite incomprehensible and quite unpredicatble to the point of being unsable and many times the defaults produce completely bizarre and unacceptable results, which are nowhere near as good as I got from APG 2.0.9 without any 'monekeying about'.
I have had many instances where colour correction didn't seem to work at all and I just ended up with a brown/grey mess; screenshots posted by others suggest that I am not alone in having this experience.
What are the 'tiricks' one must employ to get colour correction to work properly?
I solved a bug for RC that is 358 ( broken exposure and gamma correction ), so you cannot use this type of anchors.
There is another bug where the imported setting from beta 1 is doing issue. So put 'gamma' as default value, restart and that will also solves a lot of issue already.