Method: Magick::Image#blue_shift

Defined in:
ext/RMagick/rmimage.cpp

#blue_shift(factor = 1.5) ⇒ Magick::Image

Simulate a scene at nighttime in the moonlight.

Returns a new image.

Parameters:

  • factor (Numeric) (defaults to: 1.5) —

    Larger values increase the effect.

Returns:



1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
 
# File 'ext/RMagick/rmimage.cpp', line 1989

VALUE
Image_blue_shift(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double factor = 1.5;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);

    switch (argc)
    {
        case 1:
            factor = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }


    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(BlueShiftImage) args = { image, factor, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlueShiftImage), &args);
    CHECK_EXCEPTION();
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}