Changes 6.4.6.0:
* Fixed bug for RGBO image @ line, plane and partition interlace.
* Deprecate pixel methods: AcquireImagePixels(), GetImagePixels(), etc.
* New pixel methods: GetVirtualPixels(), GetAuthenticPixels(), etc.
* GPS and multivalued EXIF properties support
* Add TransparentPaintImageChroma() to MagickCore and transparentChroma()
  to Magick++.
* Correct DPX frame position property label
* Textures are no longer painted as the background color.
* Update both fields of an EXIF resolution.
* Support query-font-metrics MSL tag.
* Do not set image colorspace for the MSL modulate tag.
* Off by one error when computing affine in DrawAffineImage()
* Fixed local adaptive thresholding  when using an offset
* Set SetImagePixels() rather than SyncImagePixelCache() to update
  the pixel cache morphology.
* Set explicit image format for BlobToImage()
* p_thread_t is an aggregate under MinGW.

(adam)