I have to generate dynamically an polygon to cut the border of my raster image.
i read this articel: https://knowledge.safe.com/articles/18764/setting-alpha-vs-nodata-color-and-numeric-data.html
Option #2 sounds good, but there is a static polygon (creator transformer) used.
i have to replace the creator and add something like a polygon generator based on my raster data.
this is a demo pic. the red polygon is the polygon mentioned that I would have to calculate.
I thought of something that compares the neighboring pixels and the strong deviation from this creates the line of the polygon. is there already a transformer? or is there another suitable solution for my problem?
sorry, i'm quite new with FME
edit: picture updated. the area with green lines should be removed
