Canon 430 - Manual (Page 40)

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The following information may also be displayed with some images.
Please note that image information recorded by this camera may not
display correctly on other cameras and image information recorded
by other cameras may not display correctly on this camera.
A sound file in a format other than the WAVE format is attached or the
file format is not recognized.
JPEG file with format not conforming to Design rule for Camera File
System Standards
RAW format file
File with unrecognized format
Histogram Function
The histogram is a graph that allows you to judge the brightness of the
shot image. The greater the bias toward the left in the graph, the darker
the image. The greater the bias toward the right, the brighter the image.
If the image is too dark, adjust the exposure compensation to a positive
value. Similarly, adjust the exposure compensation to a negative value
if the image is too bright (p. 78).
Sample Histograms
Balanced Image Dark Image Bright Image