XcolorRegion man page
uint8_t md5 
The XcolorRegion typedefed structure describes a single region with an attached profile. The region is evaluated when the client enables the region and not when the region is atttached to the window. This allows clients to update the region (when the window is resized for example) by simply modifying the XserverRegion and then sending a ClientMessage.
ICC MD5 of the associated profile
XserverRegion, network byte order
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