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Thrim white borders of a tiff

Forum|Forum|9 years ago
April 28, 2016
2 replies
71 views

smurf

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

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)

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