Use sp_drv_image_substring, which accesses the Transact-SQL function substring.
sp_drv_image_substring locator, start_position, length
locator – an image_locator that references the data to manipulate.
start_position – an integer specifying the position of the first byte to read and retrieve.
length – an integer specifying the number of bytes to read.
None.
A column of type image containing the substring retrieved.
