possible bug -threshold IM 6.8.2.5 Q16 Mac OSX Snow Leopard

[anthony]

Remember original proposal is for two options
-grayscale {method} # just grayscale the image using given method (the setting is NOT set)

This is different to -colorspace gray whcih is always converting to linear grayscale.

[magick]

Right now, this works '-intensity rec601luma image.png -colorspace gray'. Oops. A patch is required. Look for it in ImageMagick 6.8.4-1 by sometime tomorrow. Thanks.