Method: Magick::Image#alpha?

Defined in:
ext/RMagick/rmimage.c

#alpha? ⇒ Boolean

Determine whether the image’s alpha channel is activated.

Ruby usage:

- @verbatim Image#alpha? @endverbatim

Notes:

- Replaces Image#matte

Parameters:

  • self —

    this object

Returns:

  • (Boolean) —

    true if the image’s alpha channel is activated


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# File 'ext/RMagick/rmimage.c', line 645

VALUE
Image_alpha_q(VALUE self)
{
    Image *image = rm_check_destroyed(self);
#if defined(HAVE_GETIMAGEALPHACHANNEL)
    return GetImageAlphaChannel(image) ? Qtrue : Qfalse;
#else
    return image->matte ? Qtrue : Qfalse;
#endif
}