Feature: improved image alpha channel handling #434
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This PR improves image alpha channel handling in loading functions.
Changes
load_and_preprocess_imagesandload_and_preprocess_images_squarefunctions now returns alpha masks.load_and_preprocess_imagesandload_and_preprocess_images_squarenow support alpha blending onto white, black and ImageNet mean background.demo_gradio.py,demo_viser.pyanddemo_colmap.py, now points that are at least 50% transparent won't be rendered.