Can this part of the code T be zero?

[chenqi13814529300]

	final_T[pix_id] = T;
	n_contrib[pix_id] = last_contributor;
	for (int ch = 0; ch < CHANNELS; ch++)
		out_color[ch * H * W + pix_id] = C[ch] + T * bg_color[ch];

[hbb1]

I think not when the bg_color is not all zeros.