Method: Magick::Image#negate

Defined in:
ext/RMagick/rmimage.cpp

#negate(grayscale = false) ⇒ Magick::Image

Negate the colors in the reference image. The grayscale option means that only grayscale values within the image are negated.

Returns a new image.

Parameters:

  • grayscale (Boolean) (defaults to: false) —

    If the grayscale argument is true, only the grayscale values are negated.

Returns:



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# File 'ext/RMagick/rmimage.cpp', line 9737

VALUE
Image_negate(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    MagickBooleanType grayscale = MagickFalse;
#if defined(IMAGEMAGICK_7)
    ExceptionInfo *exception;
#endif

    image = rm_check_destroyed(self);
    if (argc == 1)
    {
        grayscale = (MagickBooleanType)RTEST(argv[0]);
    }
    else if (argc > 1)
    {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
    }

    new_image = rm_clone_image(image);

#if defined(IMAGEMAGICK_7)
    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(NegateImage) args = { new_image, grayscale, exception };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NegateImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);
#else
    GVL_STRUCT_TYPE(NegateImage) args = { new_image, grayscale };
    CALL_FUNC_WITHOUT_GVL(GVL_FUNC(NegateImage), &args);
    rm_check_image_exception(new_image, DestroyOnError);
#endif

    return rm_image_new(new_image);
}