Method: Magick::Image#quantize

Defined in:
ext/RMagick/rmimage.c

#quantize(*args) ⇒ Object

Call QuantizeImage.

Ruby usage:

- @verbatim Image#quantize @endverbatim
- @verbatim Image#quantize(number_colors) @endverbatim
- @verbatim Image#quantize(number_colors, colorspace) @endverbatim
- @verbatim Image#quantize(number_colors, colorspace, dither) @endverbatim
- @verbatim Image#quantize(number_colors, colorspace, dither, tree_depth) @endverbatim
- @verbatim Image#quantize(number_colors, colorspace, dither, tree_depth, measure_error) @endverbatim

Notes:

- Default number_colors is 256
- Default colorspace is Magick::RGBColorspace
- Default dither is true
- Default tree_depth is 0
- Default measure_error is false

Parameters:

  • argc —

    number of input arguments

  • argv —

    array of input arguments

  • self —

    this object

Returns:

  • a new image

[View source]

10329
10330
10331
10332
10333
10334
10335
10336
10337
10338
10339
10340
10341
10342
10343
10344
10345
10346
10347
10348
10349
10350
10351
10352
10353
10354
10355
10356
10357
10358
10359
10360
10361
10362
10363
10364
10365
10366
10367
10368
10369
10370
10371
 
# File 'ext/RMagick/rmimage.c', line 10329

VALUE
Image_quantize(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    QuantizeInfo quantize_info;

    image = rm_check_destroyed(self);
    GetQuantizeInfo(&quantize_info);

    switch (argc)
    {
        case 5:
            quantize_info.measure_error = (MagickBooleanType) RTEST(argv[4]);
        case 4:
            quantize_info.tree_depth = NUM2UINT(argv[3]);
        case 3:
#if defined(HAVE_TYPE_DITHERMETHOD) && defined(HAVE_ENUM_NODITHERMETHOD)
            if (rb_obj_is_kind_of(argv[2], Class_DitherMethod))
            {
                VALUE_TO_ENUM(argv[2], quantize_info.dither_method, DitherMethod);
                quantize_info.dither = quantize_info.dither_method != NoDitherMethod;
            }
#else
            quantize_info.dither = (MagickBooleanType) RTEST(argv[2]);
#endif
        case 2:
            VALUE_TO_ENUM(argv[1], quantize_info.colorspace, ColorspaceType);
        case 1:
            quantize_info.number_colors = NUM2UINT(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 to 5)", argc);
            break;
    }

    new_image = rm_clone_image(image);

    (void) QuantizeImage(&quantize_info, new_image);
    rm_check_image_exception(new_image, DestroyOnError);

    return rm_image_new(new_image);
}