I used to make computerized t shirt designs using a “photoshop” program.
Here is a simple way to prove how halos are created.
1) create a white box the size of Obama’s birth certificate or COLB.
2)type in all the info and make it appears as it does in Obama’s document.
3)create another box in RED the same sized (I use red because it shows the results better than the green anti forgery design Hawaii uses)
4)using a magic wand or select tool, select all the lettering in the white box and copy it
5)paste the text into the red box and see the results
There is the proof Obama’s document is a forgery.
Almost every letter will have a white halo around it.
When you deselect the text layer and look at the background only, there are white artifacts where all of the letters were.
Now this makes sense if the application has attempted OCR or some other function that breaks it up into layers, but it doesn't make sense for a forgery.
Why wouldn't the green background be clean? That's what I'm trying to find an answer to.