Setting no data value to remove black borders also removes black from raster

Question

I have about 3500 8-bit RGB geotiffs with black borders. I use the Clipper to remove/define the pixels that are outside my polygons to NoData. In combination with the RasterBandNodataSetter.

But when I use 0 as a value it also removes black pixels in my map. The same with 255, it also removes white from my map. I can't find a proper value to use without losing pixels in my map/raster.

Any suggestions for this? thanks!

icon

Best answer by jdh 13 August 2015, 16:30

View original

jdh · Accepted Answer

In a similar situation I used the RasterExpressionEvaluator to set my black pixels (0,0,0) to almost black (1,1,1) prior to clippping. The difference is visually not noticeable.

geo123 · Answer

Thank you very much for this tip JDH!I used theRasterExpressionEvaluator to set the black pixels from 0,0,0 to 1,1,1 but there where still some missing pixels in the output. Notas much as before butstill too much. So I also used theRasterCellValueReplacer after theRasterExpressionEvaluator to force remaining pixels with the 0 value to 1. And now my output is okay!Thnks

Setting no data value to remove black borders also removes black from raster

2 replies

Reply

Community Stats

Reply

Community Stats

Sign up

An FME Account is required to contribute

Login to the community

An FME Account is required to contribute

Scanning file for viruses.

This file cannot be downloaded