# drawing an image on the center of the screen (ptb 3, osx) **URL:** \ **Category:** Uncategorized\ **Created:** [March 6, 2007, 2:55am UTC](https://psychtoolbox.discourse.group/t/drawing-an-image-on-the-center-of-the-screen-ptb-3-osx/1236 "2007-03-06T02:55:12Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![josephpaxton](https://avatars.discourse-cdn.com/v4/letter/j/c5a1d2/32.png) [@josephpaxton](https://psychtoolbox.discourse.group/u/josephpaxton)\ **Post date:** [March 6, 2007, 2:55am UTC](https://psychtoolbox.discourse.group/t/drawing-an-image-on-the-center-of-the-screen-ptb-3-osx/1236/1 "2007-03-06T02:55:12Z")
Hello All, What is the standard / most straightforward way of drawing an image (e.g., a jpg) on the center of the screen in PTB 3 on OSX? I see that there is a function that does this for text (DrawFormattedText). However, it looks like you have to manually specify screen coordinates by passing the "rect" argument to Screen DrawTexture in order to center an image. It's easy enough to manually determine those coordinates by trial-and- error. I take it, though, that there is a way to 1.) calculate how big the rect needs to be based on the size of your image file and 2.) figure out where to place the rect in order to center it on the basis of the parameters of your particular screen and the size of the rect. But I'm completely flummoxed when it comes to actually doing these two things. General guidelines would be very much appreciated. Sample code would be wonderful. Thanks! Joe Paxton -- Joseph M. Paxton Research Assistant Department of Psychology William James 1482 33 Kirkland Street Harvard University Cambridge, MA 02138 Phone: 617-495-3878