Re: [gdal-dev] alpha mask to data value

2014-04-04 Thread William Kyngesburye
On Apr 3, 2014, at 4:29 PM, Even Rouault even.roua...@mines-paris.org wrote: Le jeudi 03 avril 2014 23:22:17, William Kyngesburye a écrit : On Apr 2, 2014, at 6:10 PM, William Kyngesburye wokl...@kyngchaos.com wrote: I think this explains another issue I saw at one point when I had ovelap

Re: [gdal-dev] alpha mask to data value

2014-04-04 Thread Even Rouault
Le vendredi 04 avril 2014 16:08:47, William Kyngesburye a écrit : On Apr 3, 2014, at 4:29 PM, Even Rouault even.roua...@mines-paris.org wrote: Le jeudi 03 avril 2014 23:22:17, William Kyngesburye a écrit : On Apr 2, 2014, at 6:10 PM, William Kyngesburye wokl...@kyngchaos.com wrote: I

Re: [gdal-dev] alpha mask to data value

2014-04-03 Thread Even Rouault
Le jeudi 03 avril 2014 23:22:17, William Kyngesburye a écrit : On Apr 2, 2014, at 6:10 PM, William Kyngesburye wokl...@kyngchaos.com wrote: On Apr 2, 2014, at 4:33 PM, Even Rouault even.roua...@mines-paris.org wrote: Le mardi 01 avril 2014 22:14:11, William Kyngesburye a écrit : I've

Re: [gdal-dev] alpha mask to data value

2014-04-03 Thread Etienne Tourigny
On Wed, Apr 2, 2014 at 8:10 PM, William Kyngesburye wokl...@kyngchaos.comwrote: On Apr 2, 2014, at 4:33 PM, Even Rouault even.roua...@mines-paris.org wrote: Le mardi 01 avril 2014 22:14:11, William Kyngesburye a écrit : I've wrestled with various nodata issues in the past, now it's hitting

Re: [gdal-dev] alpha mask to data value

2014-04-02 Thread William Kyngesburye
On Apr 2, 2014, at 3:54 AM, Chaitanya kumar CH chaitanya...@gmail.com wrote: William, Try gdalwarp after removing the mask band. Removing the mask band is what I want, but also keeping the nodata values AND changing them to 255. If I remove the mask nodata is set to 0, but there may be

Re: [gdal-dev] alpha mask to data value

2014-04-02 Thread William Kyngesburye
On Apr 2, 2014, at 4:33 PM, Even Rouault even.roua...@mines-paris.org wrote: Le mardi 01 avril 2014 22:14:11, William Kyngesburye a écrit : I've wrestled with various nodata issues in the past, now it's hitting me again... I'm using Photoshop to delete collars on scanned maps, creating an

[gdal-dev] alpha mask to data value

2014-04-01 Thread William Kyngesburye
I've wrestled with various nodata issues in the past, now it's hitting me again... I'm using Photoshop to delete collars on scanned maps, creating an alpha mask. GDAL has no problem with this. What I want to do is merge maps together (after rectification), then set any remaining nodata areas