Hi All,
I’m having some issues to filter raster pixels by the band expression using the RasterExpressionEvaluator tranformer,
What the expression to select the pixels with the following band combination B(0)=64; B(1)=128;B(2)=104?
I have used the following settings but hasn’t worked:
Any ideas please? :)
Any ideas on this please? I have been playing around but can’t get it to work...thanks! :)
It depends a little on what you mean by “select the pixels”.
If you want to extract or keep just those pixels then you can try something like this
@if(A0]!=64&&A&1]!=128&&A&2]!=104,0,A00])
You will need to use the expression once for each band like this:
This will set all pixels to 0,0,0 except pixels with an RGB value of 64,128,104.
If, however, you want the pixels instead as a polygon you can use the RasterToPolygon coercer - this will give you the vector representation and the band vales which you can later use to test on.
Thanks