Name
lqr_carver_set_black_channel — sets the black channel index in a LqrCarver object
Synopsis
#include <lqr.h>
LqrRetVal lqr_carver_set_black_channel( | LqrCarver * carver, |
| | gint channel_index); |
Description
The function lqr_carver_set_black_channel sets the black 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 black channel
is present.
If the specified channel coincides with the current value of the alpha channel, the alpha
channel is unset.
Calling this function sets the image time of the carver to
LQR_CUSTOM_IMAGE. Furthermore, the image color model will be assumed to be subtractive by the
function lqr_rwindow_read(3) when it computes the brightness or the luma.
Return value
The return value follows the Liquid Rescale library signalling system.