How to tone your picture ->

Another world-beating feature of the S90 is a secret: if you turn the big ring while setting WB, you get instant access to warm/cool (amber/blue) WB trim. Even LEICA can't do this; it allows me to get the perfect color balance right out of the camera in AWB. Hitting DISP gets you to a screen to do this and set green/magenta balance; the trick is the ring alone will adjust A/B without needing to go deeper. HA!

Source;-> Ken Rockwell's Updates

Tricks and tips are below:-
1.With the camera off, you "1sec for playback" button (press) can expand and you can view images without lens.
2.While taking photos, you took the photo in the "func" press. First, zooming by button set "during a review can zoom.
3.In manual mode, when half the shutter button (press and hold), then press "↑" 4 - Way to cursor.

The histogram can be displayed in the program, shutter priority, aperture priority and manual. However, it is the default. You can help change the menu. Fortunately, when the histogram is described above, it needs more LCD real property. S90 shutter speed mode is selected, surprising, sometimes low-P, the camera sets the ISO. If you are a member of the P mode, or reduced, thus increasing the shutter speed, ISO.

Very nice tips i have cheap Canon a720 powershot, but i`ll try this tips.