There is no built in function for this but I can offer a couple of work-arounds. First, you could convert the image to an animated gif file where the image turns to a blank image after the desired time.
Second you could create and embed a simple HTML file that displays the image in the background of the scale item screen (see background in the users guide for more detail). The trick would be to add an automatic redirect command to the file such that it would proceed to a blank page after n seconds.
The code to do that in an HTML file might look something like this:
Say you save this as mypic.htm. Create another blank file called blank.htm and keep it in the same folder. With this code, the picture would disappear after 2 seconds but would leave the scale response in tact.<head><meta http-equiv="refresh" content="2;url=blank.htm"></head>
<img src="mypic.jpg">
In your scale response item, you would enter something like "mypic.htm (t100,l500,w300,h600)" in the background field. You would adjust the parameters for top, left, width and left according to the size of your image and where you want it to appear.
You could also play with the html file adding code to remove any margins or to make it's background color match that of your MediaLab background.
Would be happy to hear how it goes, or even to see a posted sample--or let me know if you need a hand in creating this.
See also:
http://www.empirisoft.com/support/showthread.php?t=1322
http://www.empirisoft.com/support/showthread.php?t=702
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