Color (RGB)

Question

Hi,
I'm struggling to get the color of my JPEG image right.
I'm using JGeoRaster.setDefaultRed/Green/Blue(int) before I create the RenderedImage to set the layers, but nothing changes.
Code sample:
JGeoRaster jgeor = JGeoRaster.load(mySTRUCT);
jgeor.setDefaultBlue(myblue);
jgeor.setDefaultGreen(mygreen);
jgeor.setDefaultRed(myred);
RenderedImage ri = jgeor.getRasterImage_mergeblocks(conn,pyramidLevel,x,y,width,height);
if(ri!=null) {
Graphics2D graphics2d = (Graphics2D)myCanvas.getGraphics();
graphics2d.clearRect(myCanvas.x, myCanvas.y, myCanvas.width, myCanvas.height);
AffineTransform at = AffineTransform.getTranslateInstance(0,0);
graphics2d.drawRenderedImage(ri, at);
What am I missing here?
Thanks
Cobus

Answer 1

Hi Cobus,
Have you tried using getRasterImage(...) instead of getRasterImage_mergeblocks(...)?
As a general note, we consider the GeoRaster Java functions to be internal, which means that they can be changed, renamed, or removed at any time. For this reason, we do not recommend that users invoke the Java functions directly. In fact, this is exactly the case with getRasterImage_mergeblocks, which has been replaced in use by getRasterImage.
Instead, we highly recommend that you use the PL/SQL GeoRaster functions defined in the PL/SQL SDO_GEOR package. In particular, the following functions may be of interest to you:
SDO_GEOR.setDefaultBlue
SDO_GEOR.setDefaultRed
SDO_GEOR.setDefaultGreen
SDO_GEOR.getRasterSubset
SDO_GEOR.exportTo
These and all other external GeoRaster features are described in detail in the GeoRaster Documentation at
http://download-west.oracle.com/docs/cd/B14117_01/appdev.101/b10827/toc.htm
If you have a strong need to implement your application in Java, then you can use the JDBC (java.sql) and ODBC (oracle.sql) Java API's to invoke the PL/SQL functions from within Java.
Hope this helps,
Sophia