In Apps 10 we want to add images to some lobby elements.  We use OpenAsset to store our images and can resize images for upload to IFS.  Is there a document that can provide the actual image size required to use with below sizes:

1x1

1x2

1x4

2x1

2x2

2x4

4x4

Without accurate sizing we seem to lose some elements of the image.

Thanks

Trudy