Image efficiencies

I needed to store a large quantities of images so took the following measurements:

Format	Time	Size	Sample
bmp	0.715670	1769526
gif	4.184417	501931
jpg	2.507811	22252
png	10.909442	67295
ppm	0.648540	1769488	(Blogger prevented upload)
tiff	1.011216	1769600	(Blogger prevented upload)

Gif is the clear loser - it takes a long time to process but still looks terrible.
For space use jpeg, speed ppm.

Google's new WebP format looks promising.