Dstile & jpeg

[ayman]

I know this issue has been discussed several times, but I still can't find solution for it. Dstile generate jpeg and png, png is too large so I want to use jpeg. but dstile create jpeg with black background for areas which is out of the original extent, which makes map looks so ugly. Have any one found solution for this. Or maybe I am doing this in a wrong way?!!

[remleduff]

Well, jpgs don't support transparency.

Can you use different compression parameters with the png files to make them smaller?

[ayman]

Right jpeg dosn't support transparency, and dstile has no parameters to make png smaller

[what_nick]

You can specify black as transparent for JPEG's. The PNG tiling was meant for those who wanted full quality tiles at a smaller size than DDS, so quality is lossless. I can add PNG compression options to the long list already there.

Cheers,

what_nick.

[ayman]

Thanks, but how I can specify black as transparent for JPEG's. As I know jpeg doesn't support transperancy

[ayman]

Very strange, There is two options, either I am the only one who is facing this problem and no one wants to help, or no one is trying to add his own data using dstile. I am trying to find the solution already 2 weeks no success

[Chade]

Ah. Java. Thought it was .NET. This has been done before. Anyway, search for 'imagemagic' on the forums here, you should come up with the thread on this from a couple of weeks ago.

[remleduff]

I'm pretty sure that with the current WWJ, your options are either to use png or dds or implement your own extension to TiledImageLayer that does a little manipulating of the image data before it passes the BufferedImage off to TextureIO.

I don't think the second sounds too difficult actually, but it's not implemented and talk is cheap.

Or perhaps file a bug report and wait and see if the next WWJ release addresses the issue. If WW.net assumes that RGB (0,0,0) should be transparent, it seems that WWJ probably should too.

[ayman]

Well, I did some work around, where I am using png with transparency in boundaries and jpeg for all other images.
it works
public java.net.URL getURL(gov.nasa.worldwind.util.Tile tile) throws MalformedURLException {
Sector sec = tile.getSector();
boolean equal = true;
String thePath = "";//Path to images
java.net.URL urlx = null;
if (sec.getMinLatitude().degrees< originalSecror.getMinLatitude().degrees ||
sec.getMinLongitude().degrees< originalSecror.mySector.getMinLongitude( ).degrees ||
sec.getMaxLongitude().degrees> originalSecror.mySector.getMaxLongitude( ).degrees ||
sec.getMaxLatitude().degrees> originalSecror.mySector.getMaxLatitude() .degrees)
{
equal = false;
tile.getLevel().setFormatSuffix(".png");
urlx = new java.net.URL(thePath + ".png");
}else {
tile.getLevel().setFormatSuffix(".jpg")
urlx = new java.net.URL(thePath + ".jpg" +);
}
return urlx;
}