Re: [gdal-dev] Need help generating output with alpha channels using Python API

2011-03-17 Thread Michal Migurski
On Mar 16, 2011, at 9:58 AM, Frank Warmerdam wrote: > On 11-03-14 12:50 PM, Michal Migurski wrote: >> Hello, >> >> I'm having some difficulties understanding how to get GDAL to generate >> images with usable alpha channels. I have 3-channel RGB input JPEG image, >> delivered to GDAL as a VRT with

Re: [gdal-dev] Need help generating output with alpha channels using Python API

2011-03-16 Thread Frank Warmerdam
On 11-03-14 12:50 PM, Michal Migurski wrote: Hello, I'm having some difficulties understanding how to get GDAL to generate images with usable alpha channels. I have 3-channel RGB input JPEG image, delivered to GDAL as a VRT with a projection and ground control points, which I'm warping to an out

[gdal-dev] Need help generating output with alpha channels using Python API

2011-03-14 Thread Michal Migurski
Hello, I'm having some difficulties understanding how to get GDAL to generate images with usable alpha channels. I have 3-channel RGB input JPEG image, delivered to GDAL as a VRT with a projection and ground control points, which I'm warping to an output that's no longer rectangular, leaving ba