correcting photo of the moon

[Dragonlord]

I took a photo of the moon last night and when I look at the full res tif in gimp it looks like this at the edges of light and dark.



Any thoughts as to how I can get rid of the rainbow effect.

I still have the dng files to play with if I need to do stuff in rawtherapee first

[Geoff F]

False colours are a common problem at some shooting angles.

What were your shooting settings? I can't see them in the Exif information. Although 'Shoot again with different settings' isn't a lot of help with this actual image.

I've lost touch with the latest Raw Therapee versions but you might do something with Colour Noise or something similar. Perhaps someone who is more familiar with that software can suggest the alternative which I'm attempting to recall.

[Dragonlord]

camera stats were
f/2.2 1/200s iso400 0mm focus on a lumia 1020 through a Sky-Watcher Evostar 90 with a 25mm eye piece (35X magnification F10)

[xpatUSA]

I took a photo of the moon last night and when I look at the full res tif in gimp it looks like this at the edges of light and dark.

<snip>

Any thoughts as to how I can get rid of the rainbow effect.

I still have the dng files to play with if I need to do stuff in rawtherapee first

Is there anywhere you can upload that dng, or the original raw, and give us a link? I use RawTherapee quite a lot and may be able to help.

[Dragonlord]

https://onedrive.live.com/redir?resi...int=file%2cdng

dng file

[xpatUSA]

https://onedrive.live.com/redir?resi...int=file%2cdng

dng file

Got it thanks. Later,

[proseak]

[proseak]

What format was this image originally?

[xpatUSA]

Got it thanks. Later,

Well, RawTherapee 4 won't save the DNG as anything - crashing repeatedly. But anyway, it didn't need that much for a quick fix and I had managed a couple of screen captures.

First I went to lens CA correction and set red to -0.0039 and blue to 0.0050:



Then to Exposure, click the neutral button and set highlight recovery to 32:



Was then going to attend to the noise and contrast, convert to B&W, and post the result - but I might just trash RawTherapee instead, grrrrr!

So I did it over in PSE 6:



Enjoy . . .

[DanK]

It looks to me as though your image has two distinct problems. The color casts at the high-constrast edges look like chromatic abberation. Some software (e.g., Lightroom) has tools for this that you can try, but there are also manual approaches. There are a bunch, so the best would be to Google this. In addition, you seem to have a lot of color noise--the speckles in the smooth areas. These tend to be worse if you underexpose and then boost brightness/exposure in postprocessing. This may not matter, depending on the size at which you will display the image (the smaller the image, the less it matters), but there are tools for this as well. The color noise reduction tool in Lightroom is excellent.

[xpatUSA]

What format was this image originally?

It was taken with a Nokia Lumia 1020 cellphone which is JPEG only.

http://www.microsoft.com/en-us/mobil...pecifications/

[Dragonlord]

It was taken with a Nokia Lumia 1020 cellphone which is JPEG only.

http://www.microsoft.com/en-us/mobil...pecifications/

Actually, with the latest update it's dng native, the dng that I posted was straight from the phone

[Dragonlord]

Got it thanks. Later,

Thanks for posting the corrections steps Just need to upgrade to version 4

[xpatUSA]

Thanks for posting the corrections steps Just need to upgrade to version 4

You're welcome! I removed RawTherapee yesterday in a fit of pique. I've still got the installers for V3 and V4 though . . .