Confused about screen shot format

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This is more of a comment than a question.
For years I have used "secrets" with the mac Grab utility to save screenshots 
in .png format. It did not seem to have any effect on the built-in scrrenshot 
utility (cmd-shift-4, etc). which always used .tiff.

Suddenly this changed;  Grab started saving pictures as .tiff.

I can;be sure of the next sequence, but I think I used Onyx (one of many 
blacktree secrets competitors) to try and change the format back to .png. It 
didn't help even though I noticed that the mac "defaults read" show png.

I then went to blacktree secrets and changed the screencapture type to PNG 
(secrets uses upper case).
To my amazement, the system cmd-shift-4 actions now use .png which they never 
did before and which I had read somewhee was impossible.

Grab is still using tiff, though, even though I had successfully changed to 
.png before.

"Ours is not to figure out, ours is but to do and doubt"

Original issue reported on code.google.com by [e-mail] on 20 Apr 2013 at 6:37