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edge: Canny test fails due to missing gopher-canny.png
I think it's fantastic that you've written a Canny edge detector in Go - thank you for doing this.
When I try to run go test within my github.com/robfig/graphics-go/graphics/edge folder, I get the following error:
--- FAIL: TestCannyGopher (0.57s)
canny_test.go:27: open ../../testdata/gopher-canny.png: no such file or directory
FAIL
Sure enough, I don't see that file in the folder. Any chance that file can be added?