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Messages - dpaul

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I'm new to this group and have invested in Pixinsight software. I have a monochrome camera from Mallicam (DS16c) but having problems with stacking individual RGB and L images.
I'm taking individual exposures with a luminance filter then a R, G and then B. These are the correct imaging filters from Baader (not visual ones).
I've learnt how to successfully star align the four separate images and also to dynamically crop them. I've also done a histogram transformation to make them non linear (at least I think I have).

The problem occurs when I use colour space then LRGB combination. I open the four image files but it says 'no compatible images'. I've tried xisf, tif, fits formats but still no success.
If I convert each file to gray scale then it works but then I've obviously not getting the right result (although a washed our colour stacked image surprisingly occurs).

I must be doing something fundamentally wrong. I'm using the Mallincam SKY software to capture the images and tried both the RAW and RGB setting when I save the images (RAW is what I usually do). I love the other thing so far that Pixinsight can do after reading lots of helpful advice on this forum and elsewhere - I just need to get past this fundamental problem.

Thanks

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