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Forum Newbie
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Last Login: 7/17/2008 10:30:43 AM
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| The image files that I am using in my experiment (all .bmp files) are 8x11 cm. When displayed in E-Prime, however, they are stretched to be larger (generally around 10x15). Is this a matter of screen resolution or settings in E-Prime? Is there a way to have the image display size set to be constant at the actual size of the file? Thank you!
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Forum Guru
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Last Login: Yesterday @ 5:01:57 PM
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Laura,
What is the size of your .bmp files in pixels? What is the pixel resolution of your display screen in the program you use to make your .bmp files? What is the pixel resolution of your display screen when you run your program in E-Prime?
In general, computers do not deal with images in terms of physical sizes like cm, computers only deal with pixels, and the physical size of the image at any time will depend on the underlying pixel size of the image, the pixel resolution of the display screen, the physical size of the display screen, plus any size manipulations added by the display software. (Not to mention that the visual angle as seen by the subject will also depend on the distance from their eye to the display screen, which is another factor that may need attention.)
-- David McFarlane, Professional Faultfinder
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Forum Newbie
Group: Forum Members
Last Login: 7/17/2008 10:30:43 AM
Posts: 2,
Visits: 2
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| I have been programming the experiment on a different computer than it will be run on, so I need to check the resolutions of the different screens. What confused me was that when I had the image open (in Photoshop) with the display set to "actual pixels" it was one size, and then when it was displayed as an image in E-Prime it was larger. Once I know the pixel resolution of the screen the experiment will be displayed on, how do I adjust the properties of the image in E-Prime? I am heading out of town and unfortunately will not be able to access E-Prime for awhile to try out any suggestions, but any input will be very helpful for when I return. Thanks again.
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Forum Guru
Group: Forum Members
Last Login: Yesterday @ 5:01:57 PM
Posts: 279,
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Laura,
Here are a few hints which may be of use:
1) You can set the E-Run display resolution from the Experiment Object properties. Double click on "Experiment Object", or go to Edit > Experiment on the menu. Go to the Devices tab. Double click Display, then you can set the Width, Height, and Color Bit Depth. Note that this sets the run-time resolution, which may differ from your design-time resolution.
2) Your ImageDisplay object or sub-object will have a property called Stretch. This is No by default. No means that E-Prime will display your picture without changing the number of pixels used for width or height. Yes means it will stretch (or shrink) your picture to exactly fill the "frame".
3) The frame size determines how much of the screen will be used to display your picture. If your picture has more pixels than the frame, and Stretch is No, the your picture will get cropped.
Please note that even if both screens are set to, say, 1280 x 1024, that does not mean that your picture will be the same physical size on both screens. E.g., an 800x600 image on a 19" screen (set to 1280x1024) will be physically larger than the same picture on a 15" screen set to the same resolution. Of course, you can always move the screen nearer to or farther from the subject in order to maintain the same visual angle, which is what you should be concerned about anyway.
-- David McFarlane, Professional Faultfinder
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