Recognize invert option in Image#opaque_channel with ImageMagick 7
Fix
@@ -10327,7 +10327,7 @@ Image_opaque_channel(int argc, VALUE *argv, VALUE self)
#if defined(IMAGEMAGICK_7)
exception = AcquireExceptionInfo();
BEGIN_CHANNEL_MASK(new_image, channels);
- okay = OpaquePaintImage(new_image, &target_pp, &fill_pp, MagickFalse, exception);
+ okay = OpaquePaintImage(new_image, &target_pp, &fill_pp, invert, exception);
END_CHANNEL_MASK(new_image);
new_image->fuzz = keep;
rm_check_exception(exception, new_image, DestroyOnError);
