Blue Marble image

Position:
    distance from earth surface = moon apogee - earth diameter = 405,696 km -   6,378 km = 399,318 km       [with ctrl+lmouse]






Figure out how to:
    - create a .ssc file for the feb/aug maps
        - turn off specular hilights

    X turn on the equator only  (or I suppose I could do this to the underlying image maybe)
        base my change on:  http://www.lepp.cornell.edu/~seb/celestia/hutchison/grids.html

    X specular hilights should be turned off (just because they look kind of fake?  and I don't
      think they're well-integrated into )      (this happens automatically when the equator is turned on)




things to package up:
    c:\temp\t.cel       (rename it position_over_africa.cel)
    earthgrid.png       [tell the user that it should be installed on top of http://www.lepp.cornell.edu/~seb/celestia/hutchison/grids.html)
    make_anim.bat


    Documentation about how the surfaces were converted to .dxt format:
        http://www.lepp.cornell.edu/~seb/celestia/index.html#9.1
        http://www.ati.com/developer/compressonator.html

    Explain how the bluemarble picture was used
        eesized the image from 21600x21600 to 16384x16384
                convert world.topo.bathy.200406.3x21600x21600.A2.jpg  -resize 16384x16384 16384k.jpg



Okay, we're going to do three renderings:
    June        => the large primary JPG image
    February    => first frame of smaller GIF animation, when the sun is to the north
    August      => second frame of smaller GIF animation, when the sun is to the south




Command-lines...
    to turn a 5400x2700 Blue Marble image into one that will work as a Celestia texture:
        convert Aug.world.topo.bathy.200408.3x5400x2700.jpg -resize 4096x2048 August.jpg


    to turn two 1920x1132 renderings into the single animated GIF for Wikipedia:
        convert -shave 450x25 -resize 1024 Aug_medium.jpg a.jpg
        convert -shave 450x25 -resize 1024 Feb_medium.jpg f.jpg
        convert -delay 25x10 -loop 0 a.jpg f.jpg Africa_febaug.gif

        convert -delay 30x10 -loop 0 -resize 800 Aug_medium.jpg Feb_medium.jpg Africa_febaug.gif


GCD = 32 
    256 * 32 = 8192
    675 * 32 = 21600

        8192  / 4 = 2048
        21600 / 4 = 5400


    
    resize one picture
        stream world.topo.bathy.200406.3x21600x21600.A2.jpg raw.rgb


    perl raw_crop.pl raw.rgb 21600 21600 3 a1.rgb 5400 5400 0     0     & convert -depth 8 -size 5400x5400 -resize 2048x2048 a1.rgb a1.png
    perl raw_crop.pl raw.rgb 21600 21600 3 b1.rgb 5400 5400 5400  0     & convert -depth 8 -size 5400x5400 -resize 2048x2048 b1.rgb b1.png
    perl raw_crop.pl raw.rgb 21600 21600 3 b2.rgb 5400 5400 5400  5400  & convert -depth 8 -size 5400x5400 -resize 2048x2048 b2.rgb b2.png
    perl raw_crop.pl raw.rgb 21600 21600 3 c3.rgb 5400 5400 10800 10800 & convert -depth 8 -size 5400x5400 -resize 2048x2048 c3.rgb c3.png


    montage -tile 4x4 -monitor a1.png b1.png c1.png d1.png a2.png b2.png c2.png d2.png a3.png b3.png c3.png d3.png a4.png b4.png c4.png d4.png -geometry 2048x2048+0+0 resized.jpg

    : so the image is actually now just on the top half of the image, the lower half is only black
    convert Jun.world.topo.bathy.200406.3x8192x8192.jpg -crop 8192x4096 Jun.world.topo.bathy.200406.3x8192x4096.jpg