WHAT IS IT?
Colour Bleed is the effect seen on video tapes where strong colours
seem to spread out from their correct places and "bleed" into adjacent
areas. This is especially noticeable on strong reds but normally occurs
on all colours equally, being simply more obvious on reds and to a lesser
extent on blues.
WHAT CAUSES IT?
There are two main reasons for colour bleed. The first problem is that
video recording on all normal domestic video recorders or camcorders (e.g.
VHS, S-VHS, 8mm and Hi-8) results in reduced sharpness of the colour (reduced
"colour definition"). This is a deliberate compromise to give you the best
overall quality and is generally satisfactory with first generation copies
of broadcast material, which is what most video recorders are designed
to do well. The reduced sharpness causes bright colours to spread, but
providing they stay in the correct position they can still look sharp.
This is because the eye is more concerned about the brightness part of
the picture, the part left when the colour is turned off. If this is reasonably
sharp, and the colour is in the correct position, the eye is fooled into
thinking the colour is sharper than it really is.
However, this is where the second problem arises. Very often video recorders
do not reproduce the colour in exactly the correct position, but cause
it to shift left or right a bit. Now, the eye is not so easily fooled and
sees the poor colour sharpness.
HOW CAN I CURE IT?
This is where one of the ACE's clever features comes in. The ACE can move
the colour left or right so that you can line up the colour part of the
picture with the brightnesss (black and white) part of the picture. This
is done with the "COLOUR SHIFT" control. When the colour is correctly aligned
it looks much sharper and the picture looks much cleaner. Simple isn't
This feature alone is enough to persuade many of our customers to buy
the ACE - even those with computer editing systems who find it the ideal
solution for correcting colour bleed in any non-digital camcorder sources
and on their final VHS copy.
Copyright GTH Electronics 1997 - 2009
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