LQR_CARVER_SET_BLACK_CHANNE(3) LqR library API reference LQR_CARVER_SET_BLACK_CHANNE(3)
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.
SEE ALSO
LqrImageType(3), lqr_carver_new(3), lqr_carver_set_image_type(3), lqr_carver_set_alpha_channel(3), lqr_carver_get_image_type(3),
lqr_carver_get_channels(3)
COPYRIGHT
Copyright (C) 2007-2009 Carlo Baldassi
LqR library 0.4.1 API (3:1:3) 10 Maj 2009 LQR_CARVER_SET_BLACK_CHANNE(3)