I am working on visualizing ~4100 buffered point features. The shading of the buffers is keyed to a field in the data. Because the buffers overlap, I turned on multiply in the new feature blend mode options. I like the visual result, but what seems to be missing is an ability to generate a meaningful legend for the resulting image. Are there any workarounds for this? Is the only alternative to venture down the path of polygon intersects and symmetrical difference operations?

buffered points with multiply feature blend mode


If you understand the theory of the feature blending mode "multiply" you are able to create a legend by self-assigning the colors and the corresponding value. The formula for the "multiply" blending mode color is as follows:

(color value of r, g or b)^n/256^n-1 where n = number of overlapping layers.

Example: r = 165; n = 3; "multipy" blending mode r color = 165^3/256^2 = 68.5

See this pdf for more information on "Understanding RGB Blending Modes" https://www.google.ch/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwiOuZqbg7bWAhWL0hoKHVYfCLAQFgg0MAI&url=http%3A%2F%2Fwww.leswalkling.com%2Ftexts%2Fblendingmodes.pdf&usg=AFQjCNE7PUTRkPXs3iKUKuDJHrTx5P4rIw

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