StarDot Technologies netcam XL - Manual (Page 15)

NetCam XL Page 15
• Exposure Grid- When Auto Exposure is enabled, NetCam adjusts
the exposure of the image based on the average brightness of the
pixels located in the selected regions in the Exposure Grid. If you
want NetCam to determine the exposure based on only the sky, you
would select the squares that apply to the sky (click the View Grid
button to see the grid over the image). Conversely, if you’d like
the exposure to be determined by the foreground, select only those
squares. This is comparable to the spot exposure on a traditional
camera.
Manual Exposure
Enabling Manual Exposure causes NetCam to expose images at the
value placed in the Exposure field. Keep in mind that using manual exposure
is not advised for outdoor imaging, since the light conditions are constantly
changing. You may opt to use manual exposure indoors if your lighting
conditions do not change. Here are some sample values and their fractional
and decimal equivalents:
48 = 1/1000 second (0.0001)
96 = 1/500 second (0.002)
248 = 1/200 second (0.005)
480 = 1/100 second (0.01)
800 = 1/60 second (0.1666)
960 = 1/50 second (0.020)
1600 = 1/30 second (0.0333)
3200 = 1/15 second (0.0666)
6000 = 1/8 second (0.125)*
12000 = 1/4 second (0.25)*
24000 = 1/2 second (0.5)*
32767 = 1.46 seconds (maximum exposure)*
* may introduce pixel noise
PROCESSING
Resolution
Resolution is the dimensional size of the NetCam image, measured
in pixels, horizontal by vertical. The higher the resolution, the larger the
picture appears in your browser, and the longer it takes to download. Some
resolutions, such as portrait and HD crop the image. The resolution marked
with an asterisk (*) denotes the default quarter resolution image.
Tip: As with most digital cameras, NetCam achieves the highest quality and clearest
images at quarter resolution. This is due to the way color is calculated with
digital image sensors. The largest “high quality” image on NetCam XL 640 is
320x240. On NetCam XL 1.3MP, it’s 640x480 and on the NetCam XL 3MP, it’s
1024x768.