How do I assign colors to images by wavelength in Aladin?

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Illogical
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Hello guys, sorry to be a bother but I'm currently undergoing the assessment for Galaxies, Stars and Planets, and for question 3 I'm asked to "create an RGB image from these three images by assigning an appropriate colour (red, green or blue) to each one based on their wavelength."
I've already had to select the grey colour table and the Asinh contrast, but I've no idea how I combine these three images or assign a colour to each of them.
I'm hoping that some people here have used Aladin before and could give me some guidace, which would be greatly appreciated. Thanks!
 
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Looked on image and found it, can't believe I missed it haha! Thanks a lot
 
I have the same problem this year. Using the RGB pop-up I can get the three images singly, I can't get them all to appear to be transferred together. Did you work it out? Would like to know how, if you can remember.
 
Thank you very much for your reply. I have copied p.65 and it will be a help, but I haven't managed to get the three images on to the stack together. I put one on but the next one is not added to the stack. It replaces the first one. .