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import OpenImageIO
exr_filPath = 'x:/project/testfolder/testImage.exr'

def edit_exr( exr_filPath):
    
    #renames Channels
    newimg = OpenImageIO.ImageBuf(exr_filPath)

    #adds metadata
    newimg.specmod().attribute("subRound","r2")
    newimg.specmod().attribute("nukeRef","0000")

    #writes image
    newimg.write(exr_filPath)