UPDATE PartialUpdate AS image
SET image ASSIGN < [40:50,40:50] 
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul;
 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul, 5ul
 >