Here is an example:
vattrcopy -in image_1.v -image image_2.v -out outimage.v
This call copies the image header info of 'image2.v' to the image content
of 'image1.v' and writes the result to a new file called 'outimage.v'.
Note that a file may contain more than one image. The program 'vattrcopy' effects only the header info of the first image in each of the two input files.