A Couple of HA Images "Need Help"

Striker (Tony) · #1 03-06-2006, 09:19 AM

Hi Guys,

I purchased a HA Filter to have a go at some H-Alpha imaging with a DSLR like Scott....I didn't purchase the 7nm Bandwith filter like Scotts as I couldn't justify the price so I purchased the 45nm HA Bandwith filter because it is suppose to be better for less sensative chips such as DSLR's...we will see.
http://www.alpineastro.com/filters/filters.htm#H-Alpha

Anyway I had a play last night but I dont really know what I am doing...I do remember Scott saying he only used the red channel.????

What I did was seperate the colour channel's in IP and had luminance ticked...this gave me a grey scale image...then I worked on this grey scale image...I dont know if this is correct...have I just turned a color image into Monochrome...I am unsure...any help much appreciated.

I have included what the HA Image looks like in Raw straight from the camera...but higly compressed and reduced for Web posting...bit red...lol

All Images are a stacks of 4 minute unguided images with the ED80 and 350DSLR combo from Brisbane.

EzyStyles (Eric) · #2 03-06-2006, 09:48 AM

very nice images tony. can't help you with IP though.

JohnG (John) · #3 03-06-2006, 09:59 AM

Can't recall seeing anything on the IP video's to help you there Tony, try a post on the IP group, I am sure you will get an answer there. Nice shots though, nice detail on the M8 picture.

JohnG

seeker372011 (Narayan) · #4 03-06-2006, 11:21 AM

I am not sure about IP but you can simply take the image to PS and split channels and simply discard the blue and green -they are just leakage..the red channel then converted to grey scale is your image..course you can afford to go much longer in terms of exposure compared to normal RGB images to get the benfit out of narrow band imaging

[1ponders] (Paul) · #5 03-06-2006, 11:25 AM

Very nice shots Tony. The M8 is a cracker

tornado33 · #6 13-06-2006, 10:01 PM

Howdy Tony
As Ive been taking more Ha images of late and tried playing with settings in IRIS, it still seems the best method is to remove the blue and green channels in Photoshop, leaving only the red (which then looks greyscale). The way I see it, theres minimal signal on the other 2 channels anyway, yet would still be some noise, so removing them seems best. For objects that have bright parts, I play with the gamma settings in IRIS first before going to Photoshop. Its all a bit of trial and error.
Scott