Method: Magick::Image#number_colors

Defined in:
ext/RMagick/rmimage.cpp

#number_colors ⇒ Integer

Return the number of unique colors in the image.

Returns:

  • (Integer) —

    number of unique colors



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# File 'ext/RMagick/rmimage.cpp', line 10073

VALUE
Image_number_colors(VALUE self)
{
    Image *image;
    ExceptionInfo *exception;
    size_t n = 0;

    image = rm_check_destroyed(self);
    exception = AcquireExceptionInfo();

    GVL_STRUCT_TYPE(GetNumberColors) args = { image, NULL, exception };
    n = (size_t)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(GetNumberColors), &args);
    CHECK_EXCEPTION();

    DestroyExceptionInfo(exception);

    return ULONG2NUM(n);
}