I am designing an experiment that has to do with distance and face perception.  I designed the stimulus background and I need two face images to appear simultaneously.  My experiment is running well, except that I cannot make the backgrounds of my images transparent.  Even though I edit them to be transparent in GIMP, and I set the background to transparent in eprime, they show up on a colored background.  Basically, what I need is floating heads.  I have tried to save these images in multiple formats.  This is a major obstacle, because if there is no way to make the background of the sub-images transparent I must go through each and every image (hundreds) and position them where I want them to be in the background, copy, paste, and all of that. Please help!

Thanks,

cshay

'This example loads an image to the current canvas, copies that image to

'an off-screen canvas, then uses that image to present animation.



 



'Create a Canvas

Dim cnvs As Canvas

Set cnvs = Display.Canvas 



Dim x, y, i, carlength As Integer

x = 10

y = 150

carlength = 250 



'Create off-screen canvas

Dim offScreenCnvs As Canvas

Set offScreenCnvs = Display.CreateCanvas

offScreenCnvs.Clear

offScreenCnvs.SourceColorKey = CColor("black") 



'Define the source and destination rectangles

Dim carRect As Rect

carRect.Left = 0

carRect.Right = carlength

carRect.Top = 0

carRect.Bottom = 150 



'Load the image to the active display, then copy off-screen

ImageDisplay1.Draw

Sleep 2000

offScreenCnvs.Copy cnvs, carRect, carRect 



'Define destination rectangle

Dim destRect As Rect

destRect.Left = x

destRect.Right = x+carlength

destRect.Top = y

destRect.Bottom = y+150 



cnvs.FillColor = CColor("blue") 



For i = 1 to Display.XRes-carlength

 cnvs.clear

 Display.WaitForVerticalBlank

 cnvs.Copy offScreenCnvs, carRect, destRect, ebEffectSourceColorKey

 x = x+1

 destRect.Left = x

 destRect.Right = x+carlength

 Sleep 20

Next i 



'To run this example with E-BasicExample.es, copy the script 

'above and paste it into the After InLine object. Create the

'ImageDisplay1 object in the Unreferenced E-Objects folder.

'In the Properties Window for ImageDisplay1, set Filename to 

'"redcar.bmp", and BackColor to "blue". RedCar.bmp is located

'in the Samples\PictureRT folder as part of the E-Prime install. In

'addition, set the AlignHorizontal to "left" and 'AlignVertical to "top".