Method: Magick::Image#edge

Defined in:
ext/RMagick/rmimage.c

#edge(*args) ⇒ Object

Find edges in an image. “radius” defines the radius of the convolution filter.

Ruby usage:

- @verbatim Image#edge @endverbatim
- @verbatim Image#edge(radius) @endverbatim

Notes:

- Default radius is 0 (have edge select a suitable radius)

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 5350

VALUE
Image_edge(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius = 0.0;
    ExceptionInfo exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            radius = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }

    GetExceptionInfo(&exception);

    new_image = EdgeImage(image, radius, &exception);
    rm_check_exception(&exception, new_image, DestroyOnError);

    (void) DestroyExceptionInfo(&exception);

    rm_ensure_result(new_image);

    return rm_image_new(new_image);
}