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Discussion Starter · #1 ·
Does anyone know what the exact compression factor

is for the Panamorph I?


To turn a 4:3 AR into a 16:9 AR exactly, would require

a compression factor of 75%.


However, the Cygnus calculator and the notes on the

calculator from the Cygnus website indicate that the

compression factor is 78%.


When I go to specify the size of my "16:9" screen, do I

specify a height that is 0.5625 times the width, which would

correspond to a compression of 75%?


Or do I specify a height which is 0.585 times the width,

which would correspond to a compression of 78%


Thanks in advance.


Greg
 

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Discussion Starter · #3 ·
Dave,


So I should "err" on the side of overscan vs. underscan.


That's good to know - I thought it would be the other way

around - that it would look worse to have image on the

matte than have extra active screen.


I guess I should overscan, and then mask the overscan?


Greg
 

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If I am not wrong the Panamorph is variable from 1:65 to 1:85 depending on the amount of tilt used, so either 75% or 78% is within spec. I am not sure of the distortion factors in using tilt though. I would imagine it is very small otherwise it would not be mentioned in the spec as adjustable.


DavidW
 

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Discussion Starter · #5 ·
David,


Do you know what the compression factor is with 0.0 degrees

of tilt?


Greg
 

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Yes, I think David is correct - you can play with it a bit. Regarding the overscan/underscan - obviously, it's totally up to your personal preference. If you prefer to minimize the white border around the image, you'll want to overscan.


- Dave
 

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Discussion Starter · #8 ·
David Wallis,


I thought like you did that it was 75%.


However, I ran the numbers through the calculator on the

Cygnus website and it's 78%. In addition, the Cygnus

calculator webpage has a link - "about the calculator".


If you go to the "about the calculator" page - it mentions

that the compression factor is 78%.


Greg
 
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