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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.

Rho mosaic  

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(@dav78)
Main Sequence Star Customer
Joined: 11 months ago
Posts: 42
12/06/2019 12:00 am  

Hi,

 

This is my first 100% APP processed picture.

It's a 3 tiles mosaic around Rho complex.

Gear : Sony A7S modified, Samyang 135 at f2, Star adventurer.

180 to 240 x 30 sec per tile, at ISO 3200.

I'm quite satisfied with this picture, but the more I look, the more I see the defaults : the background is to flat and darks are clipped. I think the gradient removal as been to rough.

Any idea or suggestion to improve the result ?

CS

David

 

Mosa rho2


skanker liked
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(@skanker)
Main Sequence Star Customer
Joined: 11 months ago
Posts: 32
12/06/2019 6:59 pm  

Great pic David 🙂

Thats one of my favorite regions in the night sky!

CS Gernot 


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(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 564
14/06/2019 11:03 am  

I think it's amazing! It's difficult to judge if improvements are necessary, for that a 100% crop would be nice to see. 🙂


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(@dav78)
Main Sequence Star Customer
Joined: 11 months ago
Posts: 42
14/06/2019 11:51 am  

Hi guy, thanx for your comments !

 

@vinvent-mod, the picture is a direct jpeg exported at 80% quality with APP.

So this is normally a 100% picture (you can display the picutre at 100% by opening it in a new tab - right clic).

As mentionned above, the gradient removal was a bit strong and it has also removed the "natural" gradient created by the milky way. The background should be brighter in the lower left and left sides, and darker in the right side.

And the blacks seems to be clipped too : the dust clouds should be more brown than black.

 


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(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 564
14/06/2019 12:27 pm  

Ah right, doh I should know that. haha It might just be my monitor (which is calibrated), but it doesn't seem to me that the clouds are completely black. Could this be an artefact of converting it to jpeg? What does the original look like?


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(@dav78)
Main Sequence Star Customer
Joined: 11 months ago
Posts: 42
15/06/2019 9:32 pm  

The exported jpeg looks similar to the picture displayed in APP.

Maybe a to strong rejection setting (winsor at 1 int. and kappa 3).

I think it would be nice to have a specific black control, similar to the HL control.


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(@vincent-mod)
Galaxy Moderator
Joined: 2 years ago
Posts: 564
15/06/2019 10:01 pm  

Interesting it looks so similar, I mean the compression is huge from 32-bit  to 8 of a JPG and then at a 80% level even. I'd expect with that to have clipping and with the 32-bit one not. The rejection setting is mainly for noise, it shouldn't affect the black level, and your setting is relatively mild. But testing it without any rejection might be interesting.


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