First LRGB NGC5128 QSI583

allan gould · #1 13-05-2010, 11:45 PM

Finally read up about LRGB synthesis using Photoshop so I chose NGC 5128 as my first target and did LRGB of 240:30:30:30min [binned 1x1 for luminance and 2x2 for the RGB] and stacked with DeepSkyStacker. Levels and curves and a little sharpening in Photoshop gave me a shot I was pleased with and just hope that the subtle colours come through in the low res jpeg. The QSI583wsg gives absolutely great resolution with my 10"SCT with an f6.3fr once the distance paramaters are corrected.
Comments welcome.

h0ughy (David) · #2 14-05-2010, 07:57 AM

i am no expert with using a camera with mono work

so i will keep my comment short - -nice detail

allan gould · #3 14-05-2010, 09:55 AM

Really is a problem for me to get the colour balance right - as I see it on one machine its ok and then relly crappy on another so Ive posted 2 versions. Id like to know which appears better on IIS for future posting. The only difference is colour balance done on two differnt machines.

bmitchell82 (Brendan) · #4 14-05-2010, 10:57 AM

Im going with #1, its a nicer overall balance with a bit more details.
I also found that trying to colour correct to post is like trying to explain to somebody how long a piece of string is without any measurements.!

The best thing for you to do is get a decent monitor + a colour calibration device (google spyder). This will get you in the ball park!

Nice going though you have done a cracker of a job!

Brendan

Dennis · #5 14-05-2010, 11:44 AM

Nice work Allan, both in managing the technical challenges of image acquisition as well as processing. Both are pleasing in their own right although I think my preference would be for the more saturated colour in the 1st one, but at the image scale of the 2nd one!

Cheers

Dennis

peter_4059 (Peter) · #6 14-05-2010, 12:31 PM

The first one appears to have a bit more detail - That camera/scope seems to be performaing well.

Well done.

allan gould · #7 14-05-2010, 01:23 PM

David, Brendan, Dennis and Peter.
Thanks for the kind words.
Ive attached a crop of the Luminance frame to show what detail is actually in the frame, and I'll have to get some standardisation on my colour presentations so they don't disappoint.

RB (Andrew) · #8 15-05-2010, 09:37 AM

Quote:

Originally Posted by allan gould

Ive attached a crop of the Luminance frame to show what detail is actually in the frame, and I'll have to get some standardisation on my colour presentations so they don't disappoint.

Very nice detail in there Allan.
A couple of pointers as to colour standardisation:

1. If you use Photoshop, make sure you tick Monitor RGB under View | Proof setup.

2. Tick View | Proof Colors (before you process).

3. When uploading for the web, make sure you assign sRGB as the colour space.

TrevorW · #9 15-05-2010, 10:30 AM

I'd go for somewhere between both Alan, good detail overall.

allan gould · #10 15-05-2010, 12:36 PM

Andrew
Thanks for the tips - I will employ them for my next posting.
I now go back and realise that the second effort re-done at work is way off what I see on my laptop at home (that I use to do my processing). I'll stick to that laptop as that appears to be what most people see. I compared other shots that people had done/posted and the difference between the setups was dramatic to say the least. The colour on the monitor (or how its set up) is not to be used again [one for the boss].

Again thanks for the tips Andrew and for the comments, Trevor.
Much appreciated

allan gould · #11 15-05-2010, 12:44 PM

Quote:

Originally Posted by RB

Very nice detail in there Allan.
A couple of pointers as to colour standardisation:

1. If you use Photoshop, make sure you tick Monitor RGB under View | Proof setup.

2. Tick View | Proof Colors (before you process).

3. When uploading for the web, make sure you assign sRGB as the colour space.

Sorry Andrew
Where will I find sRGB to assign as the colour space when uploading for the web. I've changed all the other parameters.
Thanks for the tips.