I'm currently using DotImage 4.0 and haven't had any luck getting the normal AutoCrop command to work:

AutoCropCommand cropCmd = new AutoCropCommand();
img = cropCmd.Apply(img).Image;

My image is just a black and white document, but running the command doesn't do anything. I've tried returning the frame size using the AutoCropCommand and it's the same as the original image. Is there something I'm missing?

Cheers

Andy

The AutoCropCommand will stop as soon as it hits 1 pixel that isn't a border color.  That is most likely what's happening. 

Our Advanced Document Cleanup add-on does a far better job as it will analyze the image rather than looking for a single pixel change.