I want to remove, or make transparent all areas where Band 0 and Band 1 are both 0. The rasterbandnodatasetter only looks at band 0 and sets those cells to nodata, which also removes information from the raster image. Is there a way to remove just the black areas (i.e. wher band 0 and 1 = 0)? I have tried to clip the image with a polygon but the black areas still remain. Is there a way to set the band values as attributes?
Best answer by gio
you say:
"where Band 0 and Band 1 are both 0. The rasterbandnodatasetter only looks at band 0 and sets those cells to nodata"
The help of the RasteBandNoDataSetter states:
"If different nodata values are desired on each band (for example, when setting nodata values on a color raster, where each of the red, green, and blue bands has a different value), then add multiple RasterBandNodataSetter transformers using either different band selections, or by using raster band splitting to separate the bands on which to set the nodata value."
so you separate or select bands 1 and 0 and test them etc.
But if all you need is to set the black area to nodata without compromising other colours with bands 1 and 0 = 0 you can of course use a clipper;
You need an alpha channel. Then you can set nodata cells to transparency.
You can use the rasterintepretationcoercer for that using "create alphaband from no data"
Then you can use a clipper. The clipped bit (wether inside or outside) will become transparent.
look at a forum question called "seaxture" (if i remember wel)
+19
I think the RasterBandNodataSetter should work.
If it wouldn't work, one of the two bands could have been selected for any reason.
Consider using the RasterSelecter to select all bands before setting nodata.
Band and Palette List: ALL
Takashi
+15
you say:
"where Band 0 and Band 1 are both 0. The rasterbandnodatasetter only looks at band 0 and sets those cells to nodata"
The help of the RasteBandNoDataSetter states:
"If different nodata values are desired on each band (for example, when setting nodata values on a color raster, where each of the red, green, and blue bands has a different value), then add multiple RasterBandNodataSetter transformers using either different band selections, or by using raster band splitting to separate the bands on which to set the nodata value."
so you separate or select bands 1 and 0 and test them etc.
But if all you need is to set the black area to nodata without compromising other colours with bands 1 and 0 = 0 you can of course use a clipper;
You need an alpha channel. Then you can set nodata cells to transparency.
You can use the rasterintepretationcoercer for that using "create alphaband from no data"
Then you can use a clipper. The clipped bit (wether inside or outside) will become transparent.
look at a forum question called "seaxture" (if i remember wel)
you say:
"where Band 0 and Band 1 are both 0. The rasterbandnodatasetter only looks at band 0 and sets those cells to nodata"
The help of the RasteBandNoDataSetter states:
"If different nodata values are desired on each band (for example, when setting nodata values on a color raster, where each of the red, green, and blue bands has a different value), then add multiple RasterBandNodataSetter transformers using either different band selections, or by using raster band splitting to separate the bands on which to set the nodata value."
so you separate or select bands 1 and 0 and test them etc.
But if all you need is to set the black area to nodata without compromising other colours with bands 1 and 0 = 0 you can of course use a clipper;
You need an alpha channel. Then you can set nodata cells to transparency.
You can use the rasterintepretationcoercer for that using "create alphaband from no data"
Then you can use a clipper. The clipped bit (wether inside or outside) will become transparent.
look at a forum question called "seaxture" (if i remember wel)
Thanks!
+19
you say:
"where Band 0 and Band 1 are both 0. The rasterbandnodatasetter only looks at band 0 and sets those cells to nodata"
The help of the RasteBandNoDataSetter states:
"If different nodata values are desired on each band (for example, when setting nodata values on a color raster, where each of the red, green, and blue bands has a different value), then add multiple RasterBandNodataSetter transformers using either different band selections, or by using raster band splitting to separate the bands on which to set the nodata value."
so you separate or select bands 1 and 0 and test them etc.
But if all you need is to set the black area to nodata without compromising other colours with bands 1 and 0 = 0 you can of course use a clipper;
You need an alpha channel. Then you can set nodata cells to transparency.
You can use the rasterintepretationcoercer for that using "create alphaband from no data"
Then you can use a clipper. The clipped bit (wether inside or outside) will become transparent.
look at a forum question called "seaxture" (if i remember wel)
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