Method: Magick::Pixel#alpha

Defined in:
ext/RMagick/rmpixel.c

#alpha ⇒ Numeric

Get Pixel alpha value.

Returns:

  • (Numeric) —

    the alpha value



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# File 'ext/RMagick/rmpixel.c', line 76

VALUE
Pixel_alpha(VALUE self)
{
    Pixel *pixel;
    Data_Get_Struct(self, Pixel, pixel);
#if defined(IMAGEMAGICK_7)
    return C_int_to_R_int(pixel->alpha);
#else
    return C_int_to_R_int(QuantumRange - pixel->opacity);
#endif
}