Hi Even, Thanks! it does solve most of the problem!
The only issue that I think is left is that nearblack scans from the borders till it reaches a valid data point and stops there. So in case of diagonal zigzag cutting (or background in holes) there will be still background left inside the zigzags or holes. A solution could be to add a parameter for a different scanning mode, instead of 4 scans from the borders till the first data point, do one or two scans (horizontal/vertical) and in each scan cover the whole scanline/row so we won't miss background trapped inside holes. What do you think? Kind regards, Idan On Tue, 29 Jan 2019 at 14:48, Even Rouault <[email protected]> wrote: > > I'm looking for an automated/semi-automated way to remove the plain color > > background of some (jpeg compressed) Orthophoto RGB rasters without > > NoDataValue or an Alpha band. > > https://www.gdal.org/nearblack.html ? > > -- > Spatialys - Geospatial professional services > http://www.spatialys.com >
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