OBIEE setting default Graph series colors.

If you want to set the default color for your graph, goto …\OracleBI\web\app\res\s_{StyleName}\chartsupport
Open the palette.cxml file and edit the sawc:color value=. The color is represented by a web Hex color.
Save the file.
Copy the file to …\OracleBI\oc4j_bi\j2ee\home\applications\analytics\analytics\res\s_{StyleName}\chartsupport.

If you want to make a custom setting for just one graph type, make a copy of this file and rename it to paletteGraph.cxml. in the GraphType.cxml point the xi:include href="fmap://chartSupport/palette.cxml" parse="xml" to the new file.
Till Next Time