to remove the blue cast from Dish 6000 HD images.
When the Dish 6000 is used with 3 component video cables in the HD mode,
the picture typically has a blue cast, especially in the shadow area.
Since there is no convenient test signals available I have found the following
procedure helpful. Note is 5 RGB cables are used then the blue cast is
not an issue.
The key is to get a good black reference. I do this by adjusting my digital
keystone collection to about 50 units off what it should be, either plus
or minus. This will make a nice projector generated black wedge as a reference
area with which to compare the Dish 6000 generated black. Now find a 4x3
movie in the HD mode, and look at the projector generated black wedge
vs the dish generated black bar. Chances are that it will look bluish
or purple. It is often useful to raise the brightness at this point by
20 units or so as it will be easier to compare the colors of black when
they are no so black. (This is one case where the black level of the 10HT
can be too good!)
Now make a custom color temperature for Dish HD component input. I would
recommend that you go back to the same gain settings that you use for
DVDs, etc. and then try adjusting bias settings to get the black areas
to match in their color. You will likely need to lower your blue bias
by about 30 units. You will likely also need to lower your red bias a
similar amount. Chances are this will fix your problem.
Now its time to adjust the brightness and contrast settings. I leave my
video memories off so that whenever the Dish input is selected you will
get the proper settings. Leave the keystone generated wedge there, for
now, and lower the brightness until the wedge and black bars blend. This
will likely be around 30. I also use some of the space scenes in the Demo
loop. Leaving the wedge there, make sure that the black of space is little
if any brighter than the wedge. Adjust contrast to keep good details in
the clouds seen from space. There is one scene where their appears to
be a dense oval cloud just above center and to the right. It will lose
detail if contrast is too high.
Restore the keystone correction and you are done.
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