constexpr Channel ALPHA_CHANNEL_ONLY[] = {ALPHA};
constexpr Channel LUMINANCE_CHANNEL_ONLY[] = {LUMINANCE};
-constexpr Channel LUMINANCE_ALPHA_CHANNELS[] = {ALPHA, LUMINANCE};
+constexpr Channel LUMINANCE_ALPHA_CHANNELS[] = {LUMINANCE, ALPHA};
constexpr Channel RGB_CHANNELS[] = {RED, GREEN, BLUE};
constexpr Channel BGR_CHANNELS[] = {BLUE, GREEN, RED};
constexpr Channel RGBA_CHANNELS[] = {RED, GREEN, BLUE, ALPHA};