Use functions in styles. #960
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Resolves #688. This can be used, for instance, to get a mask from a superpixel image. For instance, suppose you want a mask for the superpixel with an index of 82, you'd use a style like: {"function":{"name":"large_image.tilesource.utilities.maskPixelValues","context":true,"parameters":{"values":[82]}},"bands":[]} (or, if you are using superpixels with boundaries, this would be {"function":{"name":"large_image.tilesource.utilities.maskPixelValues","context":true,"parameters":{"values":[164,165]}},"bands":[]}). The resulting image (assuming you are returning a PNG), will be opaque black where this value is not present and transparent white where it is (or specify the negative and positive parameters to get different colors).
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We should definitely add some examples, like for hillshade as I outlined in #688 (comment) |
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I think hillshade is common enough that having a defined function in large-image is warranted |
Definitely. I'm torn between adding these to |
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+1 for a new module |
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Resolves #688.
This can be used, for instance, to get a mask from a superpixel image. For instance, suppose you want a mask for the superpixel with an index of 82, you'd use a style like:
{"function":{"name":"large_image.tilesource.stylefuncs.maskPixelValues","context":true,"parameters":{"values":[82]}},"bands":[]}(or, if you are using superpixels with boundaries, this would be{"function":{"name":"large_image.tilesource.stylefuncs.maskPixelValues","context":true,"parameters":{"values":[164,165]}},"bands":[]}). The resulting image (assuming you are returning a PNG), will be opaque black where this value is not present and transparent white where it is (or specify thenegativeandpositiveparameters to get different colors).@naglepuff This should be useful in showing just the superpixels from an image.