Method: Magick::Image#clut_channel

Defined in:
ext/RMagick/rmimage.c

#clut_channel(*args) ⇒ Object

Equivalent to -clut option.

Ruby usage:

- @verbatim Image#clut_channel @endverbatim

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • self


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# File 'ext/RMagick/rmimage.c', line 2454

VALUE
Image_clut_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *clut;
    ChannelType channels;
    MagickBooleanType okay;

    image = rm_check_frozen(self);

    // check_destroyed before confirming the arguments
    if (argc >= 1)
    {
        (void) rm_check_destroyed(argv[0]);
        channels = extract_channels(&argc, argv);
        if (argc != 1)
        {
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or more)", argc);
        }
    }
    else
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 1 or more)", argc);
    }

    Data_Get_Struct(argv[0], Image, clut);

    okay = ClutImageChannel(image, channels, clut);
    rm_check_image_exception(image, RetainOnError);
    rm_check_image_exception(clut, RetainOnError);
    if (!okay)
    {
        rb_raise(rb_eRuntimeError, "ClutImageChannel failed.");
    }

    return self;
}