Originally Posted by kutzon
Jack, great work! One thing: I played with it just now and compared it to other calculators and got a bit confused, since the numbers didn't match. Then I realized that while others use a 2.39:1 format for "Scope", your calculator is using 2.35:1 which I'm not sure is a good idea.
Example: if I put in a screen size of exactly 128" in http://www.screen-size.info/
(which does not deal with specific projectors, only screen size calculations), screen width is 299.9 cm and height is 125.5 cm, but if I put 128" in yours, you get a screen width of 299.2 cm but a screen heigth of 127.3 cm.
I know the difference isn't huge but it gave me some headaches ...
Thanks for you to use the calc and comment, really appreciate!
In fact I hesitated on this 2.35 or 2.39 or 2.40 thing for quite a while.
We have different formats for cinemascope: 2.39, 2.40, 2.35. What cinemascope screen ratio is reasonable?
I also checked dozens of my BD titles: most cinemascope titles are 2.39/2.40, but there are a few 2.35 existing too.
For 2.39, 2.40, 2.35 formats, I thought that if screen is 2.35 ratio
, then 2.39 and 2.40 formats can all fit in - imagine you have a lens memory capable projector, you zoom in to fit 2.39/2.40/2.35 films into the screen, they should have the same width but different height - with 2.35 just edge to edge, 2.39 and 2.40 both have black bars up and down.
On the other hand, if screen is 2.39 radio
, then 2.39 format can fit in edge to edge. 2.40 also fine, with black bars up and down. But, 2.35 will have problem - because it is "taller" than 2.40, some upper and lower parts of 2.35 picture will fall out of the 2.40 frame.
To confirm my theory (that we want to fill a 2.35:1 screen) I went to several screen manufactures' website. Unfortunatley I located only 2 of them which published the dimension of their 2.35 screens.
One is Chinese brand called JK screens. The other is America brand Elite Screens. For both the viewing area is calculated as 2.35:1.
That's why 2.35:1 is used in calculation.
Could you help to measure the actual cinemascope screen ratio, if you have one? Just want to make sure the calc to follow the best practice.