[Tig] Bad Bugs

Bob Friesenhahn bfriesen at simple.dallas.tx.us
Wed Apr 21 02:29:04 BST 2010

I notice that some networks (e.g. Starz) use poorly selected image for 
their bug icons.  These poorly selected bugs use a wide span of bright 
colors and considerable dynamic range.  The problem is that these bad 
bugs distrupt the image of any TV which uses a variable level 
backlight or iris.  These TVs evaluate average picture level, dynamic 
range of colored bits, and other proprietary measurements, to 
determine how much brightness range needs to be handled in the image 
on a real-time basis.  The bad bug throws off the TV's evaluation so 
that the image is displayed in much lower quality, particularly for 
dark scenes.  The bug on top of a dark image may display perfectly, 
but the video part of the image looks quite poor.

The good bugs are reasonably small and are mostly comprised of gray 
shades using very few levels.  The CBS and HDNet bugs are good example 
of "good bugs".

Has anyone here considered the impact of these image additions on the 
final quality of the displayed image?

Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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