auto ConvertFromExternal(Span<const uint8_t> bytes, size_t xsize, size_t ysize, size_t bits_per_sample, JxlPixelFormat format, size_t c, ThreadPool* pool, jxl::ImageF* channel) -> Status
auto ConvertFromExternal(Span<const uint8_t> bytes, size_t xsize, size_t ysize, const ColorEncoding& c_current, size_t bits_per_sample, JxlPixelFormat format, ThreadPool* pool, ImageBundle* ib) -> Status