PDF scanned on Xerox Workcentre 7535 – Part 1

A friendly reader has provided me with a scan on a Xerox WorkCentre 7535:  WH LFBC Scanned Xerox 7535 WC

The document’s creator and producer are identical: Xerox WorkCentre 7535

The document contains 17 layers. The jpg again contains the comment string YCbCr

FF FE 00 07 59 43 62 43 72

The multiple monochrome bitmap layers show a more aggressively segmented document, however the sample document shows how a Xerox WorkCentre indeed creates multiple monochrome bitmap layers.

The images are also rotated 90 degrees clockwise, unlike the WH PDF which led me to the prediction that the staffer scanned the document upside down and used Preview to correct this.

The document shows that the text is JBIG2 encoded. When saving it by Printing to PDF, the JBIG2 is saved as FlateDecode and the resulting document looks just like the WH PDF.

Note how the jpg shows ‘colors’ behind the text, an artifact created by the JPEG compression.

The JPEG is 1664×1280 and the resolution appears to be twice that of the text layers (to be verified)

Obj 10 contains the rendering instructions. XIPLAYER0 contains the JPEG, XIPLAYER_CM1 the majority of the text (1403×1749). The instructions show that the JPEG is rendered at 150 DPI (1664/798.72*72) and the text at 300 DPI (1403/336.72*72)

[NBC: Updated by removing 0000’s]

'q
                         798.72 0.00 0.00 614.40  -3.36  -1.20 cm /XIPLAYER0     Do Q q
0.0824 0.1333 0.0980 rg  336.72 0.00 0.00 419.76 236.64  95.52 cm /XIPLAYER_CM1  Do Q q
0.2039 0.3216 0.2902 rg   47.04 0.00 0.00 166.56  71.52 127.92 cm /XIPLAYER_CM2  Do Q q
0.1765 0.2863 0.2392 rg   10.32 0.00 0.00  63.36  88.80 373.20 cm /XIPLAYER_CM3  Do Q q
0.9843 g                 124.08 0.00 0.00 113.76 369.12 123.12 cm /XIPLAYER_CM4  Do Q q
0.1137 0.2392 0.1804 rg   28.80 0.00 0.00  51.36 248.16 126.00 cm /XIPLAYER_CM5  Do Q q
0.1765 0.3451 0.2667 rg   12.24 0.00 0.00  49.68 246.24 452.16 cm /XIPLAYER_CM6  Do Q q
0.7804 0.8549 0.7765 rg   31.92 0.00 0.00  83.76 280.80 444.96 cm /XIPLAYER_CM7  Do Q q
0.9804 g                  66.96 0.00 0.00  42.96 246.24 138.24 cm /XIPLAYER_CM8  Do Q q
0.1216 0.2275 0.1922 rg    7.68 0.00 0.00  21.84 315.36 243.84 cm /XIPLAYER_CM9  Do Q q
0.9882 g                  31.44 0.00 0.00  88.56 444.00 344.16 cm /XIPLAYER_CM10 Do Q q
0.9804 g                  25.92 0.00 0.00  54.72 449.76 445.20 cm /XIPLAYER_CM11 Do Q q
0.8000 0.9059 0.7686 rg   22.80 0.00 0.00  31.20 739.68 257.52 cm /XIPLAYER_CM12 Do Q q
0.8118 0.9137 0.8000 rg   24.96 0.00 0.00  17.04 737.76 110.40 cm /XIPLAYER_CM13 Do Q q
0.8118 0.9216 0.8314 rg   41.28 0.00 0.00   8.16 687.84 113.52 cm /XIPLAYER_CM14 Do Q q
0.9804 0.9961 1.0000 rg   26.16 0.00 0.00  50.40 488.16 361.20 cm /XIPLAYER_CM15 Do Q q
0.8196 0.9176 0.8039 rg   18.96 0.00 0.00  12.00 735.84 301.68 cm /XIPLAYER_CM16 Do Q'