Posted this question in the FS2004 forum with no help, so am trying posting it here.
I have finally got the aircraft carrier wake.bmp file right, but there is a display problem. I have masked of parts of the bmp to make it transparent, using the old bright - green - for - transparent bit in Paintbrush and then making it a transparent bitmap in DXTBmp.
This works fine, except for one thing. The border between the transparent and the coloured bits is being rendered as a medium grey line, of constant apparent (displayed) thickness. As a result, from a long way away, that dominates the entire texture, making the whole Effect appear to be grey. I can post some screen caps if this is not clear.
I have also tried using packages other than DXTBmp, but have found nothing that works with FS. The only comment made on the other forum was that this might be a driver issue. I have installed the latest NVidia drivers only a few weeks ago, that hasn't helped. I accept that it might be driver related, as there are still a couple of problems with the NVidia using the screen in portrait mode, which is pretty well essential for landing on a carrier.
Any positive suggestions are welcome.
Steve from Mudgee.