Graham,

There are different ways.

Some distortions, such as Object>Transform>Shear, or Effect>Warp>Whatever, may be applied to the image itself.

For others, you may (Smart Guides are your friends):

1) With the Rectangle Tool, ClickDrag from the top left corner to the bottom right corner (Smart Guides say anchor at both corners) to create a nostroke/nofil rectangle fitting the border of the image;

2) Object>Envelope Distort>Make with top object;

3) Distort the rectangle.

And you, or others, may think of other ways to illustrate the options.

Or you may give more details.

Graham,

Two apologies: first I overlooked your mentioning keystoning effect (OP), and then I overlooked you mentioning keystoning effect (post #2).

Had I not managed to do it twice, I should have suggested a simpler Envelope Distort way:

1) Create a keystoning effect distorted rectangle as desired (anywhere);

2) Select both and Object>Envelope Distort>Make with top object.

Graham,

There is no need to rasterize vector artwork before distorting it.

If you wish to show images or screenshots, you may use the Insert Image button (the camera icon above the box where you wrte the post), and you may upload images/screenshots/files to a server and post a link. There are free websites for that if you have none yourself.

James,

When I File>Place a raster image, carefully ticking Link (and having it shown as Linked Images: 1,Embedded Images: 0 in Document Info), I can perform an Envelope Distort either way described in posts 1 & 5.

Right you are, Emil. I am even still enjoying her face.

The latest downgrading specification is mentioned here (you may have read it):

http://forums.adobe.com/thread/1129944?tstart=0

Hi Kurt, thank you for the added knowledge.

I just tried with whichever kinds I had in my image folder for the forum.

It seems to work with  JPEG, TIFF, and GIF, but not with PNG (which says Linked file in the Layers palette instead of Image like the others). It only seems to work partially with an embedded PNG, any fill of the Top Object showing where there is transparency.