Narrowband Imaging

[MarkS]

Do you mean an IR pass filter?  That is supposed to be good for planetary work because IR is less affected by the seeing.

I tried an IR pass filter with the SPC webcam on Jupiter 2 nights ago. 

See http://forum.orpington-astronomy.org.uk/index.php?topic=3645.msg17444#msg17444

[Daniel]

Oooh, that's cool, So i guess that can all be colour balanced out to get the original colouration back, I was just going to use it for doing my luminance subs but i'm definetly going to try some planetary work with it now

[MarkS]

Err, no.

It is IR, which means it lacks the visible light component, so it can't be RGB balanced to make it look "normal".

I did read somewhere that the way to use the IR is to use it as a luminance channel to go with separately recorded RGB.

Mark

[Daniel]

Ahhh, I see, of course, definetly something i'll try though, might be interesting to see if I can re-map the colours using an RGB image of the same thing

[RobertM]

You can use HaRGB instead of LRGB (if that makes sense).  The Ha does throw the colour balance out so you have to be careful to merge it to the R and to the B channels carefully - something like HaR for red, HaB for blue and G, then do your normal colour balancing.  With LRGB you would just blend in the luminance channel with PS.  I took Ha,R,G and B last night and intend to use that technique (for the first time) to process the data - should be putting it in the gallery tonight barring and problems if you're interested.

[RobertM]

Forgot to add a useful link ...

www.schursastrophotography.com/powerpoint/Astroimage2006.ppt

[Daniel]

Hi Robert, thanks for this, that's amazingly helpfull, i've got all next week off so hopefully weather permitting, I'll be able to put some of this into practice