[dalight]

Frankly, this is why Stata's analysis is so off of the mark because he has focused on the letters rather than the anti-fraud markings behind them. The zone of disturbance around the text in all of these images is huge.

Anti-aliasing reflects what is printed but not what is not printed such that you wouldn't see a band of disturbance extending well beyond the letters in the background image because the background image is green on white vs the black on white of the lettering. Any anti-aliasing effects in the background would be uniform across the whole image. This is clearly not the case.

This is all well documented in Polarik's posts at Townhall.com

Was Obama's "Certificate of Birth" manufactured?

I don't see anything in Strata's commentary that deals with this in any substantial way.

[valkyry1]

A really good article there, and it shows that the NoBama BC document is a forgery.

[SE Mom]

It seems Polarik’s work is the most thorough and answers questions AJStrata leaves hanging- also for those who haven’t seen it- there’s an interesting piece over at Atlas Shrugs:

http://atlasshrugs2000.typepad.com/atlas_shrugs/2008/07/atlas-tech-expe.html

[KarlInOhio]

Frankly, this is why Stata's analysis is so off of the mark because he has focused on the letters rather than the anti-fraud markings behind them. The zone of disturbance around the text in all of these images is huge.

Anti-aliasing reflects what is printed but not what is not printed such that you wouldn't see a band of disturbance extending well beyond the letters in the background image because the background image is green on white vs the black on white of the lettering.

To me the letters stomping on the green/white background pixels away from the letter and doing it inconsistently looked like an artifact of having a very high JPEG compression ratio. The image is broken down into 8x8 blocks which are each compressed. If you have a letter end right against the edge of the 8x8 block, it won't have any effect on the next block. On the other hand if you have the leftmost column of pixels be solid black in the uncompressed scan with the other 7 columns showing the weak background, that can cause detail in those remaining 7 columns to be destroyed once compressed.

At least one of the scans I saw had an over 10:1 compression ratio, which is far too high to use with images with a lot of line art in them like text. JPEG was designed for pictures with nice gradual transitions, not text.

Also, since there are two different resolution files out there, it looks like someone scanned it, compressed it, which was then changed in resolution and recompressed. There are two words for compressing an reresed JPEG image - UG and LEE. I don't even like cutting and pasting from a JPEG unless I do it on the 8 pixel boundaries to minimize the recompression issues.