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3-4 Using WebCam Control with the WDM driver
Choosing the image’s
output size
Select the desired output size for the image from the Output Size list.
For recording live video, these resolutions are ideal: 160 x 120, 176 x 144, 320 x 240, and
352 x 288. These lower resolutions will give you a higher frame rate.
For capturing still images, larger resolutions are more suitable.
WebCam can capture images of up to 640 x 480 pixels in size.
Note that large images require more disk space to store the image files or video clips.
Large images also slow down the frame rate and increase transfer times for downloading from
or uploading to web pages.
Choosing the
color depth
Select the desired color depth for the image from the Color Space/Compression list.
The options available are:
❑
RGB 24, which is 24-bit RGB (16.7 million colors)
❑
RGB 555, which is 16-bit RGB (65K colors)
❑
I420, which is Intel Raw YUV (raw input)
Table 3-1 below shows you the color depths that are available at each supported resolution.
You can achieve the best frame rate using the I420 mode.
Table 3-1: Available color depths at various resolutions.
Number of colors
Resolution 24-bit RGB 16-bit RGB I420
640 x 480 Yes Yes Yes
352 x 288 Yes Yes Yes
320 x 240 Yes Yes Yes
176 x 144 Yes Yes Yes
160 x 120 Yes Yes Yes
128 x 96 Yes Yes Yes