Celestia Forums

Hi!
I have a texture of Mars 8192x8192. How to resize or resample this texture of Mars to 8192x4096? I tested in software IRIS resample this texture, but texture compressed in vertical.
I've gotten Cygwin, ImageMagick, and Fridger's script to creates with tiles size 1024 for use in Celestia, but the texture is`t 8192 x 4096.
Help me, i`m new in Celestia.
Thanks very mach!

tgrisha wrote:Hi!
I have a texture of Mars 8192x8192. How to resize or resample this texture of Mars to 8192x4096? I tested in software IRIS resample this texture, but texture compressed in vertical.
I've gotten Cygwin, ImageMagick, and Fridger's script to creates with tiles size 1024 for use in Celestia, but the texture is`t 8192 x 4096.
Help me, i`m new in Celestia.
Thanks very mach!

Where did you get this texture from?? Who produces big square textures? Are you sure that this is not just half of 2 VT tiles of Mars? Very strange. There are so many correct Mars textures available. What's so special with your square one??

Bye Fridger

I`ve gotten this texture from Google Mars
http://www.google.com/mars/
I copyed from the screen images and greated the texture.
I do`t know about it "...this is not just half of 2 VT tiles of Mars".
May be... But if this 2 VT tiles of Mars that what?
This is Elavation maps of Google Mars. It`s very best elavation maps.
How to greate tiles for this map fo Celestia

If the image includes all of the planet's surface features, then, technically, there is no need to resize the texture. Even though it looks squashed horizontally when you look at it by itself with an image viewer, it will be properly stretched when Celestia projects it onto the planet. Its vertical resolution will be twice its horizontal resolution, of course, but that's not necessarily a bad thing.

If the image does not include all of the surface features, then you need to use image manipulation software to add the topography that is missing.

The Map functions in Iris are best used to convert between different types of map projections, not to resize or concatenate images.

I usually use ImageMagick's convert utility to resize images. This command will create an 8Kx4K output image from any size of input image:


I usually use NetPBM's utility pnmcat to concatenate images. ImageMagick can do it too.

hi for a 8192x4096 ( real color) map see this link from the celestia motherload

http://celestiamotherlode.net/creators/ ... 8kMars.zip

and yes i am biase --it is mine

also this one
http://ltpwww.gsfc.nasa.gov/tharsis/mercat.jpg
but it is in mercat and not cyl.