color that coincides with a light cell of the bar code the pixel 39 s y value gets increased from 0 3 to 0 8 when the filter pattern is applied and the resulting color in the r g b color space is 1 0 0 5 0 5 which is a lighter value of red row 706 demonstrates a dark gray pixel that coincides with a dark cell of the bar code and row 708 demonstrates a light gray pixel that coincides with a light cell of the bar code in both cases the y value of the pixel falls within the range permitted by the filter pattern at that position so the y value remains unchanged and the color of the processed pixel in the r g b color space is identical to that of the original pixel fig8 a 8 b 8 c and 8 d illustrate a detailed view of a portion of a decorative image coinciding with two bar code cells being transformed into a corresponding portion of a composite image through the application of two filter patterns applied to each bar code cell more specifically the decorative image region 800 in fig8 a comprises a left half containing a solid gray color and a right half containing a gradient from black to white the filter pattern 810 in fig8 b and the filter pattern 820 in fig8 c represent filters that constrain the brightness of each corresponding pixel to lie between 0 and the brightnesses shown in the corresponding position in 810 and 820 where the white areas at the.