[Qgis-user] Transparency settings in qml file ignored by rasters?

[Giovanni Manghi]

Hi,

> I have hundreds of images from a miniUAV, and all of them
> are rotated according to a tfw file. QGIS positions the image within
> a rectangle of 0, so I need to set 0,0,0 to transparent, otherwise
> most of the area is overlapped by black.
> Doing this manually for each image is tedious...


meanwhile you can use gdaltools in batch mode and with warp or translate
set "-dstnodata 0" or "-a_nodata 0".

By the way, do you have any performance issue with rotated images?

see https://trac.osgeo.org/qgis/ticket/3794


cheers

-- Giovanni --