How big is viewable screen for widescreen movies?

Discussion in 'iMac' started by lindygamer, Sep 14, 2006.

  1. lindygamer macrumors newbie

    Joined:
    Sep 14, 2006
    #1
    On the 24in iMac, you will see black bars at the top and bottom when watching widescreen movies. This means that you are not seeing a full 24in diagonal picture. Does anybody know how big the picture is for movies with a normal 16:9 widescreen ratio on this computer? I think it is an important question since so many people are planning to use their 24in imac as a secondary tv/movie viewer in their homes.

    - Josh
     
  2. lightster macrumors newbie

    Joined:
    Sep 11, 2006
    Location:
    (Southern) California, USA
    #2
    Since I do not have a Mac at this point (hopefully I will tomorrow), I can only calculate the gap:

    s=screen size
    w=screen width=cos(x)*s
    x=tan^-1(10/16)
    w=cos(tan^-1(10/16))*s=.848*s
    m=movie height=(9/16)*w
    h=screen height=(10/16)*w
    g=black bar=(h-m)*.5

    So, for a 24" Mac:
    w=.848*24=20.352"
    m=11.448"
    h=12.72"
    g=(12.72-11.448)*.5=.636"
    I would estimate that the black bars will be .636" each (a total of 1.272" of the 12.72" of screen height).

    Since I ordered a 20" here are my estimates for the 20" Mac:
    w=.848*20=16.96"
    m=9.54"
    h=10.6"
    g=(10.6-9.54)*.5=.53"
    Each black bar is just over half an inch on a 20" Mac.

    These are just geeky estimates, so you may want to wait for actual measurements. Do not hold me responsible if my estimates are wrong :p :D
     
  3. SilentPanda Moderator emeritus

    SilentPanda

    Joined:
    Oct 8, 2002
    Location:
    The Bamboo Forest
    #3
    Wdiescreen movies come in different aspect ratios. 16:9 is around 1.78:1. 1.85:1 is usually close enough to be considered in the same ballpark too. 2.35:1 or 2.40:1 is "the other widescreen". That's closer to a 7:3 ratio. And of course most TV is in 4:3 (although newer shows are more and more being filmed in 16:9).

    Most widescreen monitors are 16:10. So even with a 16:9 movie you'll have slight black bars at the top and bottom. You won't miss any picture on the sides though.

    Also I officially (and affectionately) declare the person above me a nerd. :D
     
  4. lightster macrumors newbie

    Joined:
    Sep 11, 2006
    Location:
    (Southern) California, USA
    #4
    I am glad someone appreciates me :) ... and I think that might actually be the first positive response I have received on these forums :D
     
  5. lindygamer thread starter macrumors newbie

    Joined:
    Sep 14, 2006
    #5
    Thanks!

    Great, that gives me some idea!

    So, if your estimate is correct then the height of the actual picture would be 11.448 inches, which paired with a width of 20.352 inches gives a picture with a diagonal of 23.351 inches. That is bigger than I was thinking it would be, so I am happy. And yes, I know that a movie in the "other widescreen" would have a still smaller picture and larger bars. Thank you all so much.

    - Josh
     
  6. pss3jlh macrumors newbie

    Joined:
    Sep 14, 2006
    #6
    Viewing Area

    I have found that it depends on what ur viewing, Lost series 1 and Sin City DVD fill the whole screen. Something like Gladiator Widescreen is tiny.Also has anybody noticed that special features have black sections on the side not the top?
     

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