Recently I bought this device to draw online. Even though the internal storage device was auto detected when the USB cable was plugged in, the pen (or graphics tablet) function didn't work without installing the "wizardpen" driver.
Different people have tried this in different ways. For me, configuring ALSA to capture from the "Mix" device didn't work since I don't have a "Mix" listed when I try the amixer command. I could however write the ALSA output to a file by configuring the PCM chain.
Have the following code in your ~/.asoundrc file:
While not common, in rare cases you may have an image in its raw pixel format (say in rgb565). It can even be a portion of video. If you ever come accross converting such raw data to say a png or jpeg image, ffmpeg can be used easily. See the following command:
ffmpeg -vcodec rawvideo -f rawvideo -pix_fmt rgb565 -s 1024x768 -i image.raw -f image2 -vcodec png image.png
1024x768 is the geometry. image.raw is the file containing the image in rgb565 format. image.png is the new file to be written.