Robust color handling via zbar 8bpp conversion #170
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While pyzbar.decode converts PIL image into greyscale or enforces greyscale image for a (pixel, width, height) argument; it currently grabs only the first channel from NumPy arrays. That works for grayscale/standard RGB, but fails when the QR foreground/background is carried in non-first channels (e.g., red-only scenes). Since libzbar already provides reliable color→8bpp conversion, this PR routes array inputs through zbar’s converters to ensure correct decoding regardless of which channel holds the signal.
Add thin wrappers for zbar_image_convert, zbar_image_convert_resize, zbar_image_get_data, and zbar_image_get_data_length.
When a NumPy array with 3/4 channels is passed, convert to 8bpp via libzbar before scanning.
Preserve existing grayscale path; no behavior change for 8bpp inputs.