Retinol dehydrogenase with a clear preference for NADP. Converts all-trans-retinol to all-trans-retinal. Has no detectable activity towards 11-cis-retinol, 9-cis-retinol and 13-cis-retinol (By similarity). all-trans-retinol + NADP(+) = all-trans-retinal + H(+) + NADPH Cofactor metabolism; retinol metabolism. Belongs to the short-chain dehydrogenases/reductases (SDR) family.