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mask: create tunable parametric masks for use with blending

this module allows you to mask regions of the input image based on luminance and colour ranges

parameters

• mode select based on which property: luminance, hue, or saturation
• vmin the floor level of the mask
• vmax the maximum value of the mask
• envelope four values to define the begin and end of ease-in and ease-out of an envelope function

connectors

• input the input colour image
• output the mask created for the image. plug this into a blend module for instance.
• dspy the visualisation of input histogram and envelope curve