[Qgis-user] TIFF style problem

[Borys Jurgiel]

> @Borys: it might be related to #2491, but in this case transparency
> works. I am in this good situation, that on my maps no data is white,
> so setting transparency do them no harm.

Unless you have white pixels within the data area :p

> @Błażej: you can also edit black areas with any non-gis-related raster
> tool, set them white and then open in QGIS and set transparency. Just
> an old trick ;)

It's not a solution, it's heresy ;)) Nodata means nodata and nothing else. For 
formats not supporting nodata (like geoTIFF) there are two workarounds and 
both should work.

One of them is adding the alpha channel and setting it to 0, the second is to 
choose any non used value as the representative of nodata. If Błażej's files 
have "0" value used for both nodata and some data, I suppose there is also the 
alpha channel used and it should be handled by qgis.

But it isn't and we could fix it. Looks like a good start for you to work with 
cpp issues. Just set up the compile environment in the end :p

B.