be knitted in the above example the masking yarn 18 and patterning yarn 16 are chosen to have contrasting colours in order to create the image 12 in the example the first yarn 16 is a dark yarn and the second yarn 18 a light yarn it will be appreciated that instead first yarn 16 may be a light yarn and second yarn 18 may be a dark yarn it is to be appreciated that yarns 16 and 18 may have different contrasting physical properties in order to create image 12 e g yarns 16 and 18 may have different dye take up characteristics to enable selective dyeing to be performed it will also be appreciated that different knitted structures may be adopted for example an alternative knitted structure 100 for producing a pictorial image is exemplified in fig1 the knitted structure 100 is basically a miss knit structure in which both yarns 16 and 18 are knitted on alternative courses at selected positions along selected courses yarn 16 produces a float stitch 216 which extends behind a coursewise group of adjacent plain stitches 118 knitted from yarn 18 and vice versa i e yarn 18 produces a float stitch 218.