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ASTRO: NGC 4605 colour
I got some colour data for my recent image of NGC 4605. This galaxy is so
bright that colour processing was quite easy, no fight with strange gradients etc was necessary. Taken from the middle of Berlin with an 8" SCT at f/7, G11 mount, SXV-H9 camera, 43x3 minutes for Lum, 3x5 minutes each for RGB at 2x binning. The picture can also be found at http://ccd-astronomy.de/temp/4605colourgut.jpg Stefan |
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ASTRO: NGC 4605 colour
Stefan Lilge wrote: I got some colour data for my recent image of NGC 4605. This galaxy is so bright that colour processing was quite easy, no fight with strange gradients etc was necessary. Taken from the middle of Berlin with an 8" SCT at f/7, G11 mount, SXV-H9 camera, 43x3 minutes for Lum, 3x5 minutes each for RGB at 2x binning. The picture can also be found at http://ccd-astronomy.de/temp/4605colourgut.jpg Stefan ------------------------------------------------------------------------ I like it. Good seeing too. I've found with my limited Photoshop skills that Astronomy Tools helps me a lot with color gradient problems you mention, though not when the whole image has a tint like M61. The version is different for each version of Photoshop or Elements. I use PS CS. How well the other versions work I can't say. Elements has fewer tools to work with so may not be as good, I just don't know. But it saved many of my frost plagued images last winter. That frost put in horrid color gradients going in all directions. All but the worst it handled once I got the hang of it. It removes the objects somehow then creates a pseudo flat field then puts them back in again. Takes a few tries picking the right spot for "black". Eventually I got the hang of it. Only $20 US, don't know what he charges for Europe. I'm sure a photoshop expert could do better. But that's not me! Instructions are very limited. Only what's on the website so you do have to spend a couple days just playing until you figure it all out. It really helps me dig detail out of the noise level by separating the noise from the signal and subtracting it out. (Space Noise and Deep Space Noise actions and with color the Color Blotch action gives a silky gray background) Right now I'm working on an M94 shot that shows the outer faint ring (third zone) that is rarely imaged except in very long exposures, yet I was able to dig it out in only 40 minutes with Astronomy Tools. Now I'm trying to layer that in with a more normally processed shot of it. That Astronomy Tools doesn't do and I'm no good at it. Rick http://actions.home.att.net/Astronomy_Tools.html Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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