Cédric Champeau

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Try to increase the slider to 8 or 16, this should make it possible to generate more I think. Actually no it won't help. I think the issue now comes...

Did you try the above suggestion?

I am unsure about what oddity you're talking about, but the bands that you see "on band" are likely due to interferences, yes. The "Astronomie Solaire" book mentions this can...

I can see bands in the other images too, only dimmer. There might be a contrast enhancement effect which makes them more visible in the middle.

Is this a stretched image? It seems fairly saturated. It is a possibility that it's a processing artifact, in which case I'd have to figure out what is happening. Did...

That's indeed very interesting. I have no explanation for this, I'm learning too :)

I'm closing this as this has been improved in the 2.8 releases.

I am not as pessimistic as you are :) While it's true that the features are very small, they are in fact easier to detect in the spectrum itself. Look...

Not sure when you last downloaded the dev version but I made some improvements today

Give the latest dev version a try. Not perfect, but still an improvement. At least it was for me when I used it in real conditions :)