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meetdilip
 Post subject: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 1:32 am  (#1) 
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GIMP Version: 2.10.14
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OS Version: Ubuntu 18.04
GIMP Experience: Basic Level


I tried to add realistic stars to the night sky for the attached image. Tried adding noise, using night sky image, tried png of stars. Nothing had the realistic look I was hoping for. Any help will be great.


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sahara-desert-dunes-5k night.png
sahara-desert-dunes-5k night.png [ 1.71 MiB | Viewed 4513 times ]
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Wallace
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 2:30 am  (#2) 
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Try HSV Noise on a black layer and use Color Curves.
To get a something that looks star like.
Duplicate this layer twice.
Set top layer to Dodge layer mode and the other to Overlay.
Mask out what's not needed.
Adjust Opacity.

Image

Image

Image

Image

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meetdilip
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 2:53 am  (#3) 
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Thanks. I tried filter > Noise . It didn't go well. Is HSV noise different ? Nice to know that we can reduce the no. of dots ( stars ). For me, they were very saturated by volume.

I finally used a night sky image and tried with some amount of Opacity. Looks fine now.
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Wallace
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 2:56 am  (#4) 
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meetdilip wrote:
Thanks. I tried filter > Noise . It didn't go well. Is HSV noise different ? Nice to know that we can reduce the no. of dots ( stars ). For me, they were very saturated by volume.

I finally used a night sky image and tried with some amount of Opacity. Looks fine now.

Nice.
:bigthup

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meetdilip
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 3:13 am  (#5) 
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@Wallace, I want to ask something.

How come the no. of stars in the sky so less when the HSV Noise creates a lot of dots ?
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Wallace
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 3:31 am  (#6) 
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meetdilip wrote:
@Wallace, I want to ask something.

How come the no. of stars in the sky so less when the HSV Noise creates a lot of dots ?

Use Color > Curves.
Use the Layer Modes I suggested.
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meetdilip
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 3:36 am  (#7) 
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+1

You mean, darken the image so that there will be fewer stars ? What is " Layer modes " ?
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Wallace
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 3:53 am  (#8) 
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meetdilip wrote:
+1

You mean, darken the image so that there will be fewer stars ? What is " Layer modes " ?

Yes.
Layer Modes.
gimp-concepts-layer-modes @ docs.gimp.org

Yes use Color Curves.
To adjust the colors/stars to your desire.
The “Colors” Menu, “Curves” @ docs.gimp.org

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meetdilip
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 4:50 am  (#9) 
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Thanks. Not used to with the nomenclature. I think I did those :)
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Wallace
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 4:52 am  (#10) 
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meetdilip wrote:
Thanks. Not used to with the nomenclature. I think I did those :)

Ok cool.
:hi5

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meetdilip
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 5:22 am  (#11) 
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I used opacity + Layer mode - lighten only. It looks fine now :)

You guys are awesome.
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racer-x
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 6:24 am  (#12) 
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There is also the Stary Sky script.

Attachment:
stars.jpg
stars.jpg [ 241.67 KiB | Viewed 2466 times ]


Attachment:
starry-sky.scm.zip [2.19 KiB]
Downloaded 104 times


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RJKD
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 6:58 am  (#13) 
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I like the outcome produced by using the method in the video...
www.youtube.com Video from : www.youtube.com

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meetdilip
 Post subject: Re: Adding stars to the night sky
PostPosted: Mon Jan 20, 2020 7:51 am  (#14) 
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racer-x wrote:
There is also the Stary Sky script.

Attachment:
stars.jpg


Attachment:
starry-sky.scm.zip


Thanks.
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