# screen problem again -- more info **URL:** https://psychtoolbox.discourse.group/t/screen-problem-again-more-info/1174 **Category:** Uncategorized **Created:** [September 9, 2003, 12:54pm UTC](https://psychtoolbox.discourse.group/t/screen-problem-again-more-info/1174 "2003-09-09T12:54:42Z") **Posts on this page:** 1 **Page:** 1
### Author: ![ksledgeccn](https://avatars.discourse-cdn.com/v4/letter/k/e99b99/32.png) [@ksledgeccn](https://psychtoolbox.discourse.group/u/ksledgeccn) #### Post date: [September 9, 2003, 12:54pm UTC](https://psychtoolbox.discourse.group/t/screen-problem-again-more-info/1174/1 "2003-09-09T12:54:42Z")
I posted a message yesterday about a problem I'm having displaying pictures in matlab on one of the computers I'm using. Here is some more information. Recap: I have a program that works on old iMacs (OS 9) and a PowerBook G4 (OS X), but is not working on another Mac computer (PowerMac, OS 9) that has a separate monitor. More Details: The resolution is 1024x768, 75Hz, and when I went into the control panels, I discovered that this is the ONLY option--I wasn't even allowed to downgrade to a lower resolution. The computer displays either 256 colors or thousands, but not millions. The problem: With the following code, screenNumber = 0; [window, screenRect] = screen(screenNumber, 'OpenWindow', bgcolor); the program would crash, the screen would not open, and the error was that this setting was not available. I assumed that the default (32 bits?) was just something this computer did not support. So, I specified the screen rect and the pixel size. screenNumber = 0; [window, screenRect] = screen(screenNumber, 'OpenWindow', bgcolor, [0 0 1024 768], 16); The program ran...but the pictures were all messed up. They looked like visual noise. You could only make out the shape and the colors used-- everything else was scrambled. Incidentally, the pictures are stored as 8-bit jpegs. They're about as simple as I could make them. I thought that maybe it would be better to specify the resolution instead of the pixel size, because that is something that screen lets you do. I performed ResoutionTest to see all of the computer's monitor details. Then, I performed NearestResolution on this information, and stored that as a variable that I entered into this part of the code (where I had entered pixelsize before). I got the same problem where the pictures would display in a distorted manner. res = NearestResolution(screenNumber, [1024, 768, 75, 16]); screenNumber = 0; [window, screenRect] = screen(screenNumber, 'OpenWindow', bgcolor, [0 0 1024 768], res); Other information: the numbers/letters I display in the program (between the instructions and the stimuli) displayed perfectly. I was using imread to read the image, and putimage to display it. image = 'example.jpg'; imageArray=IMREAD(image,'jpg'); screen(buffer,'PutImage',imageArray); % ("buffer" is an offscreen window) Any thoughts?