I use CorelDraw for creating wireframe layouts for iOS app UI. For this I need to set up a rectangle as following, to act as screen boundary:

Size in pixels: 640 x 1136px

Size when unit changed to millimeters: 51.7 x 90.4mm

This can help realistic pixel-level control, and at the same time printing on a paper in actual size. How do I achieve this?

I tried setting document DPI to 326, which is iPhone's PPI, but it didn't help.


You have a mistake calculating the size in centímeters. According to the pixel size you are providing, you are refering to the Iphone 5, which have 4" in diagonal (10.16cm) https://www.apple.com/iphone/compare/, wich will be more or less 4.98x8.85 cm.

But in any case, the best workflow would be changing the document unit from cm to pixels (Design > Prepare page), and you can asign the 640x1136 px size directly (1920x1080 px for newer iphone 6 plus), and just asigning the 326 ppi (or 401 ppi) for the printed sample.

| improve this answer | |
  • Thanks. The original question was intended for iPhone 5 only, where there seems to be a mistake in physical dimensions. I got correct printable size now. However, how did you get the physical screen size? I can always measure, but a reference could be useful. – excitive Jan 12 '15 at 7:21
  • I used some math. – Rafael Jan 12 '15 at 18:40
  • 1) Take the relationship 640/1136 2) Do some pitagoras law a2+b2=c2 1304"px" in diagonal 3) Rule of thirds if 1304=4" then 640=x 4*640/1136 =1.98 inch – Rafael Jan 12 '15 at 18:46
  • (Rule of three, not thirds... that is on photography :oP) – Rafael Jan 13 '15 at 16:44

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.