M27

peter_4059 (Peter) · #1 07-09-2010, 08:24 PM

Next up - M27 crop. Again captured at astrofest with the QHY8pro/Newt. This image is 47x5min subs and despite cropping took a lot of compression to get it under the posting limit

Thanks for looking!

h0ughy (David) · #2 07-09-2010, 09:59 PM

i think the compression has crueled it? can you save at a lower res and higher compression? i foound that shots with a lot of data in it i have had to do that. lots of detail there - maybe a tad on the green side on the star front?

peter_4059 (Peter) · #3 08-09-2010, 08:04 PM

I thought the low res/high compression was causing the problem? I'll try resizing to a smaller image size.

troypiggo (Troy) · #4 09-09-2010, 05:27 AM

Great image scale. Not sure about the colours. Not on a calibrated monitor here but they may be a little off.

p1taylor · #5 09-09-2010, 06:15 AM

Very good image but as Tony says colours a bit to britte on my monitor.

peter

multiweb (Marc) · #6 09-09-2010, 05:58 PM

Great details but the processing lets the data down a tad. Less saturation and watch the clipping too then you'll have a corker in no time.

Alchemy (Clive) · #7 09-09-2010, 07:09 PM

There are some nice details within the image, I did this object a long time ago but never since as it's so low down here.

peter_4059 (Peter) · #8 10-09-2010, 04:03 PM

Thanks for the feedback and advice. I've had a go at reprocessing this data today - hopefully not so overdone this time. Here's the full frame...

h0ughy (David) · #9 10-09-2010, 06:13 PM

Peter - somehow you need a blend of the two

Alchemy (Clive) · #10 10-09-2010, 06:21 PM

I have a qhy8 also and it has a tendency to make a green cast to an image when it's first imported. As a simple opener on an image I bring it up about a quarter to a third..... Somewhat less than your second image then do a color balance in the sky background, the blue starsdont quite have the punch for some reason so a quick upper only lift in blue in the curves can give it just more of a tweak, en whip it into maxim for a DD stretch tinkering with the base and middle values til it looks not bad, then to light room for a color tweak... This has some really nice color functions.

This will give me a quick overview of the images potential.

The problem with your first image was a greeny blue cast that particularly washes into the stars, at least to me anyway. I think e expectation is the following, blue stars are really blue in the halo, same for yellow stars thatbseems to be the trend to me, so once defining the star colors the background needs to have a value of 20 ish, and it can have a slight blue tinge, don't rely on your eyes, after staring at a screen for an hour or two imthink you get desensitized, use the eyedropper, this will give you values in rgb that define it exactly. Hopefully if these things are right so is the color of the object.
I think that's enough for now others can tip in if they like

Clive

peter_4059 (Peter) · #11 11-09-2010, 01:16 PM

OK - onto repro number 2 now with a calibrtated monitor...hopefully the green is history now!!

h0ughy (David) · #12 11-09-2010, 01:30 PM

much better - -top stuff

peter_4059 (Peter) · #13 11-09-2010, 01:35 PM

Cheers Dave. I was surprised at how much different the image looked pre and post monitor calibration. I can now see why people often comment on the images being clipped or too green. Now I'm going to have to do a lot of re-processing!

Peter

RobF (Rob) · #14 11-09-2010, 01:41 PM

Yep, that last one has great colour balance. Its quite a striking image Peter - not sure how you've processed, but expect its just all the extra contrast from dark skies + the light sucking ability of the 10".

I think you could push for a bit more impact on that final nicely balanced one. Love the star colours you have now too....

Alchemy (Clive) · #15 12-09-2010, 07:16 AM

Much nicer.

troypiggo (Troy) · #16 13-09-2010, 11:40 AM

Lookin SWEEEET! Glad the calibration thing worked out for you, and that it definitely is worth it.