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APP 1.075 has been released !

2019 November: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse, Astronomer in Charge of iTelescope.net

2019 September: Astro Pixel Processor and iTelescope.net celebrate a new Partnership!

NGC 7000 LRGB  

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(@skanker)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 43
January 1, 2019 15:54  

Hello 🙂

Here is my last picture taken in my garden around christmas.

Canon 6D(a) + Tamron 70-200mm 2.8 + Fornax Lightrack II + Optolong L Pro

33x 120 sec. / F4 / ISO 1600

30 darks / 20 flats / 60 bias 

NGC 7000

 

CS Gernot


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(@leuthold)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 8
January 8, 2019 02:08  

Very nice.  My only critique is that it looks like blacks are clipped.


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(@skanker)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 43
January 8, 2019 07:51  

Maybe you're right... Where can i check the blacks? In the histogram?

CS Gernot


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(@vincent-mod)
Quasar Moderator
Joined: 2 years ago
Posts: 1009
January 9, 2019 02:39  

Yes, you need to stretch so that data is not clipped when looking at the histogram, usually you then see a sudden sharp cut-off on the left side instead of a nicer curve.


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(@skanker)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 43
January 9, 2019 07:52  

Damn... I' ve to take care of this in my next projects! Thanks for your feedback 🙂

CS Gernot


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(@mabula-admin)
Quasar Admin
Joined: 3 years ago
Posts: 2168
January 9, 2019 22:27  
Posted by: skanker

Hello 🙂

Here is my last picture taken in my garden around christmas.

Canon 6D(a) + Tamron 70-200mm 2.8 + Fornax Lightrack II + Optolong L Pro

33x 120 sec. / F4 / ISO 1600

30 darks / 20 flats / 60 bias 

NGC 7000

 

CS Gernot

Great image Gernot 😉 @skanker @vincent-mod @leuthold

Very nice. My only critique is that it looks like blacks are clipped.

Indeed, some of the blacks are clipped which you want to avoid.

Here is an example with and without Black Clipping, if you visually look at the image/data, sometimes it isn't that apparent, but the Histogram tells you what actually is happening, the Left Side of the Histogram needs to be near zero to prevent black-clipping anywhere in the image.

With Black Clipping, see left side of the Histogram:

Black Clipping Check LeftSide Histogram

Without Black CLipping, again, see left side of the Histogram:

No Black Clipping Check LeftSide Histogram

Cheers,

Mabula

This post was modified 11 months ago by Mabula Haverkamp - Admin

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@skanker)
Main Sequence Star Customer
Joined: 1 year ago
Posts: 43
January 10, 2019 07:47  

Thanks  Mabula!

 


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