millisec test timings and screen refresh rate

[Brian Yennie]

Keep in mind that this script doesn't show one way or another when  
the image is actually visible to the user. In other words, does the  
following script line always execute exactly when the image is  
visible, or not, regardless of how long it took to display the image?

In any case, just to throw some more ideas out there - if time to  
display IS an issue, there are several different ways to go about  
showing an image which could potentially be compared:

## original method
show image x

## move onscreen
set the loc of image x to y

## undo/redo total transparency
set the blendLevel of image x to 0|100

## remove a graphic covering the image
hide grc "image_cover"

## set a button icon to an offscreen image
set the icon of btn "image_display" to the id of image "myImage"

Hope that spurs some ideas!


> The following script showed a 5 megapixel image in 30 milliseconds  
> regularly on my laptop.  I did the test on an image that was 78x78  
> pixels and got an average of 8 milliseconds.
>
> on mouseUp
>     put the milliseconds into temp
>     set the vis of img 2 to true
>     put the milliseconds - temp
>
>     wait 2 seconds
>     set the vis of img 2 to false
> end mouseUp