Canon POWERSHOT SD400 DIGITAL ELPH User Manual page 42

When shooting or playing back images, the shooting information, review
information or replay information appears on the LCD monitor.
When setting the flash, continuous mode, self-timer, macro mode, infinity
mode, or the metering method, the shooting information displays on the
LCD monitor for approximately 6 seconds even if the LCD monitor is set to
Standard (No Information) or Off. It may not display under some
circumstances, depending on the selected settings.
A slow shutter speed has likely been selected because of insufficient
lighting if the upper indicator beside the viewfinder blinks orange after
the metering preparations are complete and the camera shake icon
appears in the LCD monitor. Set the flash to _ or _g_, or affix the
camera to a tripod to shoot.
,, Right after a shot is taken, the image and its information appear in
the LCD monitor for 2 seconds (or the selected number of seconds if
the review time was changed or until the shutter button is pressed
again if the Hold option is selected) even if you release the shutter
button (p. 63). If you continue to press the shutter button right after
shooting an image, or press the FUNC,ISET button while the image
is displayed, the image will continue to display.
,, While a recorded image is displayed on the LCD monitor, you can
check the exposure with the graph (see Histogram Function p. 43)
that shows the distribution of the brightness data. If the exposure
requires adjustment, set the exposure compensation and reshoot.
Press the DISR button if the histogram and other information are not
shown.
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