InDesign 'Actual' size zoom

Discussion in 'Design and Graphics' started by LERsince1991, Oct 30, 2009.

  1. LERsince1991 macrumors 65816

    Jul 24, 2008

    In my InDesign CS4 when I zoom to 100%, its not actually 100%.
    To get the actual size it would be physically is around 125%.

    Is there something thats gone wrong somewhere, could someone explain why this 100% zoom isnt actually 100%...

  2. Dane D. macrumors 6502a

    Apr 16, 2004
    What resolution are you viewing at? Did you actually printout and put on screen the printout or just guessing?
  3. Designer Dale macrumors 68040

    Designer Dale

    Mar 25, 2009
    Folding space
    If you are measuring the screen image with a ruler, this may explain. What you view on the screen is not what you print. The screen is just a placeholder for the work. Screens have different resolutions, and this affects it too. Some are 72dpi and others are 96dpi. The new iMac has a 115dpi screen. What represents an inch or a given unit of metrics will measure different on each but they represent the same unit. I have an ad that measures 6.5in. on my screen at 119% and prints at about 7.5in. in my Epson. Some is lost in that "Shrink to Fit" thing.

    Hope this muddies it up for you. Enjoying Uni?

  4. Blue Velvet Moderator emeritus

    Jul 4, 2004

    So, a potential work around. Mine is about 130-135% btw.
  5. panoz7 macrumors 6502a


    Nov 21, 2005
    Raleigh, NC
    Indesign assumes your screen is 72dpi and bases the percentages off that. In order to calculate what is actually 100% you need to do the math based on your screen.

    Based on your sig it looks like you have two monitors. They most likely have different dot pitches so you'll have a different "100%" for each.

    Your macbook has a 13.3" with a 1280 x 800 resolution, so to calculate the dpi you use this equation: dpi = sqrt(1280^2+800^2)/13.3 = ~113.5. Once you have the dpi you divide it by 72 to find what zoom in indesign you need to be at to have things display actual size. On the macbook screen that number is 157.6%. If you do the math for your 22" screen, assuming its resolution is 1680 x 1050 you get ~90dpi which results in a zoom of 125%, matching what you discovered via guess and check.

    EDIT: See this post for a better worded explanation of the math:
  6. username8 macrumors newbie

    Oct 30, 2009
    I don't have an answer for you, but I asked if adobe's zoom percentages are totally meaningless on another site and apparently we are the only ones who realize this stupidity.
  7. design-is macrumors 65816


    Oct 17, 2007
    London / U.K.
    I've nothing to add to the maths/science of it, but I also match 'actual size' at 125%

    Always thought you should be able to adjust it.

    A really anoying thing is that it's not even consistant between all the different aps.

  8. LERsince1991 thread starter macrumors 65816

    Jul 24, 2008
    Ah right well as long as its not just me :p
    It is a stupid thing though, should be able to calibrate it otherwise the values are useless!

    Thanks everyone for contributing to a workaround!
    Also thanks Panoz07 for working it out for both my screens :D

    Hey Designer Dale,
    Yes I'm loving uni and actually I should say a massive thanks to everyone on this forum as they have helped me along the way learning different software which now means I'm a massive amount ahead in terms of technical skills than most others on my course. InDesign, photoshop, Illustrator and a bit of 3D CAD.

    I'm afraid I don't dare upload any of my presentations to my website though as I don't want people to plagiarise and then I get marked 0... They are very strict here. For me, this uni thing is a perfect life so far :D I've got everything I've ever wanted (hmm, well apart from things like a mac pro, Lamborghini etc.. but you know what I mean)

    Looks like i'll be using 125% zoom alot then :)

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