It is currently Fri, 23-06-17, 20:48 GMT

All times are UTC




Post new topic Reply to topic  [ 13 posts ] 
Author Message
 Post subject: The Sun
PostPosted: Sun, 07-04-13, 21:07 GMT 
Offline
User avatar

Joined: Tue, 04-09-07, 21:55 GMT
Posts: 749
Location: N 42.38846 W 83.45456
some people have been wanting a better "star" texture
and yes the 512x512 default gstar does map to a sphere without a pinch if remapped to polarstereographic

but it's 512x512 size ... well

a 2048x1024 png
Image
-- 4k B&W grayscale map
"4k.e31hr_B3_cr2134.png"
Image

screenshots from my add on testing install of 1.6.1

-- new ---
Image
-- old --
Image

the map is a remapped version of
"SOLIS VSM: Helium Carrington Rotation Maps"
http://solis.nso.edu/vsm/vsm_maps.php

ftp://solis.nso.edu/synoptic/level3/vsm ... 134.fts.gz
-- the jpg version
ftp://solis.nso.edu/synoptic/level3/vsm ... cr2134.jpg

the sin mapping with the parallels at 50.45 was remapped to celestia's default with the poles fixed

if any one wants to use it please include the acknowledgment from
http://solis.nso.edu/data_policy.html


Last edited by John Van Vliet on Sat, 27-04-13, 3:01 GMT, edited 1 time in total.

Top
 Profile  
 
 Post subject:
PostPosted: Sun, 07-04-13, 21:17 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4447
Location: Hamburg, Germany
Thanks John,

I am actually using it in test operation, since you published the texture at shatters. Intuitively, the zones of relatively intensive yellow shades seem a bit odd. We all know that visually, the yellow color of typical G2 stars should be barely noticable given the enormous brightness of the star.

Actually are your textures here and at shatters identical??

Fridger


Top
 Profile  
 
 Post subject: re
PostPosted: Sun, 07-04-13, 21:35 GMT 
Offline
User avatar

Joined: Tue, 04-09-07, 21:55 GMT
Posts: 749
Location: N 42.38846 W 83.45456
the old shatters one was NOT remapped
i got part way through making a few and noticed i made a mistake

i have 5 more B&W images i will upload
from different dates

take a look at the distances from 0 to 30
then 30 to 60 and 60 to 90 on the jpg version

-- i just updated the one on shatters


the B&W is there for anyone that wants to edit the color, feel free to .

the yellow one is only a close approx. to the default /medres/gstar.jpg

_________________
"I don't pitch Linux to my friends, I let Microsoft do that for me."
Using OpenSUSE 42.1 & Scientific Linux 6.7


Last edited by John Van Vliet on Sun, 07-04-13, 21:40 GMT, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: re
PostPosted: Sun, 07-04-13, 21:39 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4447
Location: Hamburg, Germany
John Van Vliet wrote:
the old shatters one was NOT remapped
i got part way through making a few and noticed i made a mistake

i have 5 more B&W images i will upload
from different dates

take a look at the distances from 0 to 30
then 30 to 60 and 60 to 90 on the jpg version

-- i just updated the one on shatters


Oh good to know. I'll certainly have a closer look at the new versions...

Thanks,
F.


Top
 Profile  
 
 Post subject:
PostPosted: Mon, 08-04-13, 4:12 GMT 
Offline
User avatar

Joined: Tue, 04-09-07, 21:55 GMT
Posts: 749
Location: N 42.38846 W 83.45456
a few more
4096x2048 grayscale
4k.e31hr_B3_cr2056.png
Image
4k.e31hr_B3_cr2097.png
Image
4k.e31hr_B3_cr2098.png
Image
4k.e31hr_B3_cr2114.png
Image


Last edited by John Van Vliet on Sat, 27-04-13, 3:04 GMT, edited 4 times in total.

Top
 Profile  
 
 Post subject:
PostPosted: Mon, 08-04-13, 10:08 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4447
Location: Hamburg, Germany
John,

many thanks for the 4k grayscale textures that are really the best for advanced actions. All it takes now is to get hold of a scientific level G2 color gradient and then to use GIMP's
colors->Map->Sample Colorize... with such a gradient, after your grayscale texture has been converted to RGB, of course. At the end, I applied a bit (0.85) of the great Wavelet Denoise... filter, to increase the texture density after the colorization process (with subcolors activated).

Fridger


Top
 Profile  
 
 Post subject:
PostPosted: Mon, 08-04-13, 10:24 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4447
Location: Hamburg, Germany
After a quick GIMP hack to examine the amount of visible color detail of your 4k texture, it looks like plenty of potential! Of course, things need to be done properly with a scientific-level color gradient of the sun etc.

Here is a very small colorized portion in natural resolution, using just a prefabricated GIMP gradient:
Image

Fridger


Top
 Profile  
 
 Post subject:
PostPosted: Mon, 08-04-13, 19:43 GMT 
Offline
User avatar

Joined: Tue, 04-09-07, 21:55 GMT
Posts: 749
Location: N 42.38846 W 83.45456
i am starting out with the float fits image
normalising it to 0 to 65536
remapping it and exporting to 8 bit for use in gimp
( fixing the poles in gimp using resysenthiser )

i can post the rather smaller remapped fits in 16 bit tiff ( 1800x900 )
i have been upscalling them in polar mapped images using resysenthiser then remapping to simple cylindrical

_________________
"I don't pitch Linux to my friends, I let Microsoft do that for me."
Using OpenSUSE 42.1 & Scientific Linux 6.7


Top
 Profile  
 
 Post subject:
PostPosted: Sun, 14-04-13, 4:57 GMT 
Offline
User avatar

Joined: Tue, 04-09-07, 21:55 GMT
Posts: 749
Location: N 42.38846 W 83.45456
one more
4k.e31hr_B3_cr2023.png
Image


Last edited by John Van Vliet on Sat, 27-04-13, 3:05 GMT, edited 1 time in total.

Top
 Profile  
 
 Post subject:
PostPosted: Sun, 14-04-13, 9:25 GMT 
Offline
Site Admin
User avatar

Joined: Fri, 31-08-07, 7:01 GMT
Posts: 4447
Location: Hamburg, Germany
John Van Vliet wrote:
one more
Image


This one looks particularly interesting...
Unfortunately no time for the moment, we are currently submerged in the last preparations for the public dev. start (SVN) of celestia.Sci...

F.


Top
 Profile  
 
 Post subject:
PostPosted: Sat, 27-04-13, 2:59 GMT 
Offline
User avatar

Joined: Tue, 04-09-07, 21:55 GMT
Posts: 749
Location: N 42.38846 W 83.45456
Probably the last one for awhile.
There are enough here for people to work with .
-- have fun --
4k.e31hr_B3_cr2135.png
Image


Top
 Profile  
 
 Post subject: Re: The Sun
PostPosted: Sat, 30-11-13, 6:21 GMT 
Offline
User avatar

Joined: Tue, 12-11-13, 23:16 GMT
Posts: 39
Location: MinneSNOWta
(Hopefully 6 months isn't still too late to reply! :° )

I like the textures; very nice!

I myself do have a question though. While I believe I can safely assume the answer is yes, I have regardless wondered though, whether during the processing of the images and textures, has the inclination of Earth's orbit to the Sun's equator been accounted or compensated for, so that the latitudinal sunspots are fairly horizontal?

Regardless, hasn't stopped me from enjoying these! I do appreciate the efforts put into these. :)


Top
 Profile  
 
 Post subject: Re: The Sun
PostPosted: Sun, 01-12-13, 8:00 GMT 
Offline
User avatar

Joined: Tue, 04-09-07, 21:55 GMT
Posts: 749
Location: N 42.38846 W 83.45456
as far as i know the data from
http://solis.nso.edu/0/vsm_maps.php
is mapped to solar north/ south

but it is over time and is not visual but magnetic

but they look nice once cleaned up

and it is less work than remapping soho images


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group