Method: Magick::Image#linear_stretch

Defined in:
ext/RMagick/rmimage.c

#linear_stretch(*args) ⇒ Object

Call LinearStretchImage.

Ruby usage:

- @verbatim Image_linear_stretch(black_point) @endverbatim
- @verbatim Image_linear_stretch(black_point , white_point) @endverbatim

Notes:

- Default white_point is pixels-black_point

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new image

See Also:

  • Image_contrast_stretch_channel.
  • get_black_white_point
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# File 'ext/RMagick/rmimage.c', line 7874

VALUE
Image_linear_stretch(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double black_point, white_point;

    image = rm_check_destroyed(self);
    get_black_white_point(image, argc, argv, &black_point, &white_point);
    new_image = rm_clone_image(image);

    (void) LinearStretchImage(new_image, black_point, white_point);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}