Description

The function lqr_carver_set_alpha_channel sets the alpha channel index of the image stored in the LqrCarver pointed to by carver to channel_index (between 0 and channels - 1, where channels is the number of colour channels of the carver).

Use a negative value for cahnnel_index to specify that no alpha channel is present.

If the specified channel coincides with the current value of the black channel, the black channel is unset.

Calling this function sets the image time of the carver to LQR_CUSTOM_IMAGE.

Return value

The return value follows the Liquid Rescale library signalling system.

See also

LqrImageType(3), lqr_carver_new(3), lqr_carver_set_image_type(3), lqr_carver_set_black_channel(3), lqr_carver_get_image_type(3), lqr_carver_get_channels(3)