Method: Magick::Image#add_noise_channel

Defined in:
ext/RMagick/rmimage.cpp

#add_noise_channel(noise_type, channel = Magick::AllChannels) ⇒ Magick::Image #add_noise_channel(noise_type, *channels) ⇒ Magick::Image

Adds random noise to the specified channel or channels in the image.

Overloads:

  • #add_noise_channel(noise_type, channel = Magick::AllChannels) ⇒ Magick::Image

    Parameters:

    • noise (Magick::NoiseType) —

      the noise

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

      a ChannelType arguments.

  • #add_noise_channel(noise_type, *channels) ⇒ Magick::Image

    Parameters:

    • noise (Magick::NoiseType) —

      the noise

    • *channels (Magick::ChannelType) —

      one or more ChannelType arguments.

Returns:



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# File 'ext/RMagick/rmimage.cpp', line 734

VALUE
Image_add_noise_channel(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    NoiseType noise_type;
    ExceptionInfo *exception;
    ChannelType channels;

    image = rm_check_destroyed(self);
    channels = extract_channels(&argc, argv);

    // There must be 1 remaining argument.
    if (argc == 0)
    {
        rb_raise(rb_eArgError, "missing noise type argument");
    }
    else if (argc > 1)
    {
        raise_ChannelType_error(argv[argc-1]);
    }

    VALUE_TO_ENUM(argv[0], noise_type, NoiseType);
    channels = (ChannelType)(channels & ~OpacityChannel);

    exception = AcquireExceptionInfo();
#if defined(IMAGEMAGICK_7)
    BEGIN_CHANNEL_MASK(image, channels);
    GVL_STRUCT_TYPE(AddNoiseImage) args = { image, noise_type, 1.0, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AddNoiseImage), &args);
    END_CHANNEL_MASK(new_image);
#else
    GVL_STRUCT_TYPE(AddNoiseImageChannel) args = { image, channels, noise_type, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(AddNoiseImageChannel), &args);
#endif
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}