How do I prevent black pixels around edge of raster when converting ESRI Raster Dataset File gdb to .ecw?

Hi @lizsanderson,

Here is my workspace:

workspace.png

Here are the properties of the Reader:

readerproperties.png

Here are the Writer properties:

writerproperties.png

I tried this same workspace without the RasterBandNoDataRemover transformer and just the Reader->Writer and I still get the same black pixels added.

Here is the starting raster:

originalimage.png

Here is the ECW result:

blackpixels.png

I am not sure why these pixels are being added, they aren't in the original raster. Any thoughts?

I suspect the problem is coming in because there may be two values of 'NoData' coming in from the reader. I've seem problems like this in the past. When performing a resample of the data this is where the issues can arise. Are you reprojecting at all in the worklow? We may be resampling upon write also.

Also check out the reader parameter 'Nodata Handling for Managed Rasters' By default this is set to add an alpha band and set transparency on the image where the original 'NoData' parts of the image were. When re-sampling some cells may be changing values which are not covered by the alpha mask. This makes them appear visible.