Wrong divisor?

[huntiep]

goimagehash/transforms/pixels.go

Line 22 in d811588

lum := 0.299*float64(r/257) + 0.587*float64(g/257) + 0.114*float64(b/256)

goimagehash/transforms/pixels.go

Line 49 in d811588

return 0.299*float64(r/257) + 0.587*float64(g/257) + 0.114*float64(b/256)

I think the divisor for the blue byte should be 257 as well.