Method: Magick::Image#blur_channel

Defined in:
ext/RMagick/rmimage.cpp

#blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image #blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

Blurs the specified channel. Convolves the image with a Gaussian operator of the given radius and standard deviation (sigma).

Overloads:

  • #blur_channel(radius = 0.0, sigma = 1.0, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • radius (Numeric) (defaults to: 0.0) —

      the radius value

    • sigma (Numeric) (defaults to: 1.0) —

      the sigma value

    • channel (Magick::ChannelType) (defaults to: Magick::AllChannels) —

      a ChannelType arguments.

  • #blur_channel(radius = 0.0, sigma = 1.0, *channels) ⇒ Magick::Image

    Parameters:

    • radius (Numeric) (defaults to: 0.0) —

      the radius value

    • sigma (Numeric) (defaults to: 1.0) —

      the sigma value

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



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# File 'ext/RMagick/rmimage.cpp', line 2036

VALUE
Image_blur_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    ExceptionInfo *exception;
    ChannelType channels;
    double radius = 0.0, sigma = 1.0;

    image = rm_check_destroyed(self);

    channels = extract_channels(&argc, argv);

    // There can be 0, 1, or 2 remaining arguments.
    switch (argc)
    {
        case 2:
            sigma = NUM2DBL(argv[1]);
        case 1:
            radius = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            raise_ChannelType_error(argv[argc-1]);
    }

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(BlurImage) args = { image, radius, sigma, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlurImage), &args);
    CHANGE_RESULT_CHANNEL_MASK(new_image);
    END_CHANNEL_MASK(image);
#else
    GVL_STRUCT_TYPE(BlurImageChannel) args = { image, channels, radius, sigma, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(BlurImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}