[vtkusers] GetPixelData Incorrect

[Kevin H. Hobbs]

I've been having trouble saving images on my workstation. 

Everything looks fine on the screen, but the saved images have many pixels of 
incorrect color.

This makes almost every test on this workstation fail.
http://www.cdash.org/CDash/viewTest.php?onlyfailed&buildid=204175

Strangely I'm able to save RGBA images.

I tried to set all of the pixels to blue gray [84 89 109], and then read them 
back. When they aren't what I set I print out the values that I get. This 
gives me :

	...
	Pixel data not what we set.
	[109 255 84]
	Pixel data not what we set.
	[89 109 255]
	Pixel data not what we set.
	[255 84 89]
	Pixel data not what we set.
	[109 255 84]
	Pixel data not what we set.
	[89 109 255]

The source and the image I get are attached.

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