Control size of photo sent to client/renderer

Aside from <LimitImageResolution> is there any way to get more control over size of image (photo) sent to the client? I understand the server actually sends several versions? I want it to send only a thumbnail and the maximum size possible (either the original image size or scaled down to 4096x4096). Is hat posible? thanks.

[zip]

it's not, it always sends more versions of the image