place points based on luminance of a bitmap

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how could you place points on a surface based on the luminance of a bitmap to increase the probability?
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I think this tutorial is more than a good start http://www.sidefx.com/index.php?option=com_content&task=view&id=1030&Itemid=216 [sidefx.com].

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thanks for that one it was handy. but a bitmaps resolution exceeds the point resolution which is why im after it. im guessing it will involve vops.
https://openfirehawk.com/ [openfirehawk.com]
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This project's goal is to provide an open source framework for cloud computing for heavy FX based workflows and allows end users to pay the lowest possible price for cloud resources.
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