Hi, I have some large 1 bit single band tiffs and I want trim the empty white space from each edge of the image.
Maybe 25 pixels from the 1st black pixel found on each border if possible.
I think I need to determine the 1st black pixel from the border on each side then use this info to create a polygon to clip the image.
I just have no idea how to work out the area I want to clip within the workbench, not much of a raster expert.
Best answer by jdh
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+22
Assuming your borders are not regular:
Set the white pixel to NoData
Use the RasterExtentsCoercer in DataExtents mode
HullAccumlator to get a single output polygon with no holes
Buffererer (-1*#pixels*pixel_size)
Assuming your borders are not regular:
Set the white pixel to NoData
Use the RasterExtentsCoercer in DataExtents mode
HullAccumlator to get a single output polygon with no holes
Buffererer (-1*#pixels*pixel_size)
geat thanks, I do want regular borders so have adjusted the RaterExtentsCoercer to use DataMBRExtents.
Some twueking to do but looks like I can achieve what I want with these transformers, thanks for the help.
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