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 Post subject: Re: Pluto
PostPosted: Sun, 02-08-15, 19:47 GMT 
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---- WARNING!!!!
the Pluto and Charon maps are using the usa/usgs default 0 to 360 mapping !!!!



like the Ceres map the N-pole on Charon is a bit dark
something like this maybe
-- 2k resize
Code:
gmic PIA19866.tif --split_freq 8% -n[2] 1,255 -o[2] hipass.png

Image

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 Post subject: Re: Pluto
PostPosted: Mon, 03-08-15, 0:22 GMT 
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John Van Vliet wrote:
---- WARNING!!!!
the Pluto and Charon maps are using the usa/usgs default 0 to 360 mapping !!!!


Celestial Phineas wrote:
Oops,
I forgot to say one thing, the above maps correspond to the NASA map, i.e. with the meridian at the left. To use the above as a piece of texture, some more changes needed to be done.

;)
I guess I didn't make it clear or nobody noticed, ha.
In my screenshot, the Celestia texture uses the right mapping, with my texture images here using the default mapping, though.
It seems to be necessary to do a small change on the rotation parameters.
And,
t00fri wrote:
While the Charon map may look easier to render in celestia.Sci/ Celestia it is NOT. When I am satisfied with my results, the Charon map will be available for download, of course...

So, celestia.Sci does better on texture rendering than Celestia? What's the progress? Curious... ;)

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 Post subject: Re: Pluto
PostPosted: Tue, 04-08-15, 17:15 GMT 
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Hanghang,
Hanghang wrote:
t00fri wrote:
While the Charon map may look easier to render in celestia.Sci/ Celestia it is NOT. When I am satisfied with my results, the Charon map will be available for download, of course...

So, celestia.Sci does better on texture rendering than Celestia? What's the progress? Curious... ;)


I didn't state in your quote that texture rendering of solar system bodies was better in celestia.Sci than in Celestia. Rather I used the syntax "celestia.Sci/Celestia" to indicate that my statements apply to both.

In general it is true, however, that the rendering of deepSpace objects, notably galaxies (spiral, elliptical and irregular types), globular clusters etc. is vastly improved in celestia.Sci compared to Celestia.

Fridger

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 Post subject: Re: Pluto
PostPosted: Tue, 04-08-15, 18:17 GMT 
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John Van Vliet wrote:

like the Ceres map the N-pole on Charon is a bit dark
something like this maybe
-- 2k resize
Code:
gmic PIA19866.tif --split_freq 8% -n[2] 1,255 -o[2] hipass.png

Image


John,

yes, the too dark coloration around the Northpole of Charon was one of the issues that bothered me. Your gmic run improved the situation quite a bit.

Here is a corresponding screenshot from celestia.Sci that used
Code:
gmic PIA19866.tif --split_freq 8% -n[2] 1,255 -o[2] hipass.png

before auto-coloration in GIMP.

[Click on image for a larger display]
Attachment:
charon_highpass_Sci.jpg
charon_highpass_Sci.jpg [ 142.94 KiB | Viewed 1888 times ]


Although only little known (and not included in OpenSuSE 13.1), gmic seems to be a quite powerful software. I'll certainly be going on to explore it further. Notably I am curious about it's memory management for really large images. The latter was an intolerably weak point in the ImageMagick package!

Thanks for the link to gmic!

Fridger

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 Post subject: Re: Pluto
PostPosted: Tue, 04-08-15, 23:54 GMT 
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t00fri wrote:
I didn't state in your quote that texture rendering of solar system bodies was better in celestia.Sci than in Celestia. Rather I used the syntax "celestia.Sci/Celestia" to indicate that my statements apply to both.

In general it is true, however, that the rendering of deepSpace objects, notably galaxies (spiral, elliptical and irregular types), globular clusters etc. is vastly improved in celestia.Sci compared to Celestia.

Fridger

I misunderstood the slash. ^^'
The new rendering of Deep Sky objects looks nice. Maybe a higher vision of OpenGL is required? Will it still be able to see the more realistic Deep Sky objects on machines that even OpenGL 2.0 is not supported?
And, ... excuse me, but why the Charon gets a little bit more brown? Auto-coloration?

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 Post subject: Re: Pluto
PostPosted: Wed, 05-08-15, 18:33 GMT 
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Celestial Phineas wrote:
The new rendering of Deep Sky objects looks nice. Maybe a higher vision of OpenGL is required? Will it still be able to see the more realistic Deep Sky objects on machines that even OpenGL 2.0 is not supported?


The improved rendering of deepsky objects in celestia.Sci does not require very new versions of OpenGL or the embedded shader language GLSL. OpenGL 2.1 and GLSL 1.2.x should be fine throughout. I don't know any machines that are seriously limited to OGL< 2.0. I am aware that some Windows machines can come with OGL 1.10. So just in such extreme cases, the system needs some upgrading...

Moreover, for celestia.Sci to run, a recent version of Qt 4.x or better Qt 5.x needs to be installed, which is a simple task.

Most of the DSO rendering progress came from using mostly advanced shader technology, plenty of experience, patience and ... valuable collaboration with our team member for graphics, Christophe Campos (aka ElChristou) ;-).

For a joint view of a great globular cluster (NGC 104) and an irregular galaxy (SMC) have a look in a recent thread of mine: SMC viewed from the rich globular NGC 104
This example is from my thread: Finalizing Irregular Galaxy Rendering in celestia.Sci

It is crucial to use your maximum possible display size!

Click first on the image. If the cursor shape shows a "+", click again twice onto the image, such that the cursor first becomes a "-" and then once more a "+". Finally hit the browser's fullscreen key shortcut. For Firefox this would be the F11 key! .

The natiive image resolution is 1920x1200 pix
Quote:

And, ... excuse me, but why the Charon gets a little bit more brown? Auto-coloration?

Yes, of course, Charon is somewhat too dark here, but an overall global brightening is thoroughly trivial. Concentrating instead on the gmic action only, I just ignored the brightness issue temporaily. The discrepancy is not related to GIMP auto-coloration, but rather to the fact that the official Charon rectangular map seems to involve a different amount of contrast/brightness setting than that corresponding to the official global view of Charon.

For Pluto, auto-coloration worked very well as you can see in a comparison I did higher up.

Fridger

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 Post subject: Re: Pluto
PostPosted: Thu, 06-08-15, 3:18 GMT 
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i am using a older version of gmic
the work flow changed and you will need to do a custom build to enable 16 bit signed support

the older version has a 4 gig max image size - do to 32 bit software coding

this might be fixed in the current
h t t p : / / gmic.eu/files/source/gmic_1.6.5.1.tar.gz
or git -
Code:
git clone https://forge.greyc.fr/git/gmic


and it IS in the opensuse repos
the OBS graphics repo
https://software.opensuse.org/package/gmic

add this url to the yast gui tool for managing software
/ kick-off / yast2 / "software management"
-- FOR the LTS 13.1 opensuse
Code:
 http://download.opensuse.org/repositories/graphics/openSUSE_13.1



you might remember from shatters i used a tool called "GREYStoration " it is part of "Cimg.h"
( h t t p : //cimg.eu/ )
Gmic is the successor to that

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 Post subject: Re: Pluto
PostPosted: Thu, 06-08-15, 14:14 GMT 
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Thanks John for your further info about the G'MIC software.

John Van Vliet wrote:
i am using a older version of gmic
the work flow changed and you will need to do a custom build to enable 16 bit signed support

the older version has a 4 gig max image size - do to 32 bit software coding

Ah thanks. We'll see...
Quote:
this might be fixed in the current
h t t p : / / gmic.eu/files/source/gmic_1.6.5.1.tar.gz
or git -
Code:
git clone https://forge.greyc.fr/git/gmic


Aha. I had actually compiled and installed this latest version right after you quoted the first link to the G'MIC software.
Quote:
and it IS in the opensuse repos
the OBS graphics repo
https://software.opensuse.org/package/gmic

I had only looked in the stable 13.1 package repository, which I normally prefer for production work. Using your openSuse link, I have meanwhile also installed the latest verstion (1.6.5.0) that is available for OS 13.1 or 13.2. This will be useful for comparison with my compiled version 1.6.5.1...

Fridger

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 Post subject: Re: Pluto
PostPosted: Sun, 16-08-15, 14:06 GMT 
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http://pluto.jhuapl.edu/soc/Pluto-Encounter/view_obs.php?image=data/pluto/level2/lor/jpeg/029932/lor_0299323929_0x630_sci_2.jpg&utc_time=2015-07-16%3Cbr%3E03:40:10%20UTC&description=OpNav+Campaign+4%2C+LORRI+1X1&target=PLUTO&range=2.0M%20km&exposure=100%20msec

http://pluto.jhuapl.edu/soc/Pluto-Encounter/data/pluto/level2/lor/jpeg/029932/lor_0299323929_0x630_sci_2.jpg

-----------------------

https://blogs.nasa.gov/pluto/2015/08/10 ... -nitrogen/

98% Nitrogen to pluto's

Image

But Pluto’s atmosphere is ~98% N, while Earth’s is only ~78% N. Pluto’s atmosphere is also considerably thinner than Earth’s with ~10,000 times lower pressure at the surface.

The water ice (H2O) that we are familiar with on Earth would be completely rigid and stiff at Pluto’s surface temperatures, but ice made out of N2 would be able to flow like a glacier. So where does all of this nitrogen come from?


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 Post subject: Re: Pluto
PostPosted: Sun, 16-08-15, 17:13 GMT 
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Many thanks symaski62,

the blue color of the backscattering halo does furnish important info!
I'll see what it will mean for the Mie theory parametrization!

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 Post subject: Re: Pluto
PostPosted: Sun, 27-09-15, 18:09 GMT 
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Action around Pluto/Charon in celestia.Sci

[Click in image + browser full screen (F11 in Firefox)]
Attachment:
pluto_n6121.jpg
pluto_n6121.jpg [ 107.25 KiB | Viewed 1632 times ]


The globular is NGC 6121.

And this one looking a bit odd due to Pluto's atmosphere composed of nitrogen (N_2) with minor components of methane (CH_4) and carbon monoxide (CO).
View from the Pluto surface onto Charon and the Milkyway.

[Click in image + browser full screen (F11 in Firefox)]
Attachment:
pluto_surface.jpg
pluto_surface.jpg [ 65.6 KiB | Viewed 1625 times ]


Presumably, the atmosphere is much thinner...

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 Post subject: Re: Pluto
PostPosted: Mon, 28-09-15, 12:15 GMT 
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Or close to sunset on Pluto's surface. Near the sun's position you can also make out the inner planerts...

[Click in image + browser full screen (F11 in Firefox)]
Attachment:
pluto_sunset.jpg
pluto_sunset.jpg [ 62.49 KiB | Viewed 1620 times ]


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 Post subject: Re: Pluto
PostPosted: Thu, 01-10-15, 21:48 GMT 
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G'MIC is great, the GIMP plugin version is on my list of "must-haves" when I set up my environments. Haven't played around much with the command-line version. Using it in GIMP, you still end up with the bits-per-pixel limitations of GIMP, at least until the GEGL version comes out, whenever that might be...


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 Post subject: Re: Pluto
PostPosted: Fri, 02-10-15, 0:38 GMT 
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the gmic-gimp plugin builds fine using Gimp2.9.1 DEVELOPMENT ( and gimptool-2.9.1 and the 2.9 libs )
Gimp 2.9.1 supports 16 bit and 32 bit images
BUT
not all the plugins have YET to be ported to the pre gimp 2.10 version

a image of the Dawn HAMO 28 image of the day (converted to a Heightmap - 16 bit ushort ) -- Ceres
Image
Gimp 2.9.1 gmic 1.65.3

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