Method: Magick::Image#sharpen_channel

Defined in:
ext/RMagick/rmimage.c

#sharpen_channel(*args) ⇒ Object

Sharpen image on a channel.

Ruby usage:

- @verbatim Image#sharpen_channel @endverbatim
- @verbatim Image#sharpen_channel(radius) @endverbatim
- @verbatim Image#sharpen_channel(radius, sigma) @endverbatim
- @verbatim Image#sharpen_channel(radius, sigma, channel) @endverbatim
- @verbatim Image#sharpen_channel(radius, sigma, channel, ...) @endverbatim

Notes:

- Default radius is 0.0
- Default sigma is 1.0
- Default channel is AllChannels

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new image


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# File 'ext/RMagick/rmimage.c', line 11921

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

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

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

    new_image = rm_clone_image(image);

    GetExceptionInfo(&exception);
    (void) SharpenImageChannel(new_image, channels, radius, sigma, &exception);

    rm_check_exception(&exception, new_image, DestroyOnError);
    (void) DestroyExceptionInfo(&exception);

    return rm_image_new(new_image);
}