Share:

The problem with the data upload limit for attachments has been fixed. I have restored it to 30MegaBytes. A recent forum software upgrade was responsible for the changed limit. Please accept my apologies for missing this when upgrading the forum sofware, Mabula.

NGC 7000 LRGB  

  RSS

(@skanker)
Main Sequence Star Customer
Joined: 11 months ago
Posts: 33
01/01/2019 3:54 pm  

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


ReplyQuote
Topic Tags
(@leuthold)
Brown Dwarf Customer
Joined: 2 years ago
Posts: 6
08/01/2019 2:08 am  

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


ReplyQuote
(@skanker)
Main Sequence Star Customer
Joined: 11 months ago
Posts: 33
08/01/2019 7:51 am  

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

CS Gernot


ReplyQuote
(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 580
09/01/2019 2:39 am  

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.


ReplyQuote
(@skanker)
Main Sequence Star Customer
Joined: 11 months ago
Posts: 33
09/01/2019 7:52 am  

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

CS Gernot


ReplyQuote
(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2113
09/01/2019 10:27 pm  
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 7 months ago by Mabula Haverkamp - Admin

Main developer of Astro Pixel Processor and owner of Aries Productions


ReplyQuote
(@skanker)
Main Sequence Star Customer
Joined: 11 months ago
Posts: 33
10/01/2019 7:47 am  

Thanks  Mabula!

 


ReplyQuote
Share: