add alpha_mask attribute to ImageData and refactor mask#814
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Jul 22, 2025
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This PR does:
alpha_maskattribute to the ImageData class (ref: Semi-transparent cloud mask developmentseed/titiler#1183)The
alpha_maskhas to be an numpy array in form of(height x width)with the same datatype as the data array. Values can be have to be between the min/max data type value (uint8: 0,255; int16: -32768, 32767, ....).If present, the
alpha_maskwill be returned by the.maskproperty (used in.render()method) breaking changerefactor the
.maskproperty to make sure the array has the same datatype as the dataadd more tests for mask datatype and imageData array copy
ToDo
alpha_mask