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i-pfm: netpbm float map input

this reads .pfm files, i.e. simplistic netpbm little endian rgb floating point maps. does not flip y coordinate.

parameters

• filename the name of the input file, potentially containing %04d for sequences
• startid the index of the first file if loading a sequence

connectors

• output 32-bit floating point precision version of the f32 input file.