#136 Problem detecting (almost) diagonal Code128 Barcode

[Reiner]

The attached code128 barcode is not detected by zbarimg.
What is the reason?
Thank you in advance!

zbar 0.10, Win 7 / 64,

Command: zbarimg code128.tif

Output:
scanned 0 barcode symbols from 1 images

WARNING: barcode data was not detected in some image(s)
things to check:
- is the barcode type supported? currently supported symbologies are:
EAN/UPC (EAN-13, EAN-8, UPC-A, UPC-E, ISBN-10, ISBN-13),
Code 128, Code 39 and Interleaved 2 of 5
- is the barcode large enough in the image?
- is the barcode mostly in focus?
- is there sufficient contrast/illumination?