General Comment to ALL about redaction:
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The obscuring on the image above is ineffective if privacy was the goal.
Tracking barcode:
If any part of a barcode line is visible it can be either read or the barcode reconstructed enough to be decoded - in this case it was directly decodable by software with no manipulations, and trackable at USPS.com
If any of the bars of the Code 128 tracking barcode were completely obscured image software and probably most barcode scanners would then fail to read it, but many, many need to be obscured completely to really redact the info - the barcode is sequential, each 3bar/3space sequence is a 2 digit number portion of the tracking number, each sequence is always 11 units wide so missing bars can be inferred, and the check symbol, if not obscured could also be used to help reverse engineer missing bars (guess at missing bars using 11 wide rule, compute checksum, check against check symbol, repeat). I manually decoded the first 6 digits of the full 30 digit tracking number from the image of the barcode using a lookup table. PITA, but doable.
Other than obtaining entire tracking number to be able to track the shipment, only info of interest would be destination zipcode embedded in there, and that already shows in plaintext in destination address if readable.
Human readable tracking number:
Looks completely obscured but a couple of digits inferable, and all 20 digits completely reveled with a quick gamma adjust.
2D datamatrix barcode:
Upper right of label was not directly decodable, but it looks like a few minutes of image editing *might* be enough to make it so. (there isn't really anything in that barcode of concern though)
Addresses:
Most of the destination address is directly readable, as is a lot of the return address - more made readable with some image manipulations, some inferred/filled in via tracking info, and some missing info could possibly be filled in via google with what is readable.
Just pointing out that a lot more obscuring is necessary if truly hiding the info is the goal.
I use Irfanview for most of my image editing, and generally use a "fine explosion" filter to completely wipe out information - it leaves enough context without being reversible. Cutting out or flood filling selections in the image also an option. If working with physical label as above, covering areas of interest with paper, post-it notes, etc is an effective option.
