* pencam-0.50, December 13,2001.  I adapted the saturation filter from the 
  Gimp plug-in. A default value of 50% gives fairly good images, but it can 
  skew colors in ways you may not like. As always, you can turn it off.  
  Made the toggle keys true toggle keys; you don't have to hit enter.
  Removed 3-pass unsharp mask filter option (1-pass remains).  Hey, I gave 
  you warning and plenty of time to tell me if you were using it.  If you 
  wanted me to keep it you should have said something sooner.

* pencam-0.42, November 20, 2001.  I adapted the sharpen filter from the 
  Gimp plug-in, by Michael Sweet <mike@easysw.com>.  This is faster and 
  easier to use than the unsharp mask, and I have made it the default choice.  
  Unsharp mask remains as an option.  Fixed a printout bug in light_enhance, 
  and tweaked the gamma- white balance filters a bit. Selection of gamma-white 
  filter and sharpness filter are now toggles: just keep hitting the key to 
  cycle through all posibilities.

* pencam-0.41, November 8, 2001. I changed the menu structure slightly so 
  that if a filter is turned off, the "change <filter> parameters" menu 
  does not display. Also started using a structure, usb_stv, for holding 
  various parameters. This is almost the same structure used in the webcam 
  driver. I want to keep the two programs somewhat synchronized, and using 
  the structure makes it easier to pass some values to subroutines. Added 
  camera info (usb bus ID, firmware, ASIC rev, sensorID, supported formats) 
  to the header. The image size in the .ppm file now agrees with the stated 
  size (in the ppm file in previous versions, an image reported as 640x480 
  was actually 632x472). Gamma correction and white balance routines were 
  supplied by Alexander Schwartz. Automatic filter selection routine was 
  added, but the user can select the filter manually or disable the whole 
  filter (you really don't want to do this; the images are MUCH better 
  with the new filter). Took out the brightness filter as it is no longer 
  needed, but in its place added a brightness reduction factor (sometimes 
  the images are a little bright- depends upon the light source). Fixed 
  some bugs in the unsharp mask filter. 

* pencam-0.3, September 8, 2001. I improved the error checking on a few 
  input routines, converted the brightness filter to use pointers (for 
  speed), and added the option to do 3 separate color unsharp mask passes 
  with individual parametrs instead of 1 3-color pass.

* pencam-0.2.1, September 4, 2001. I realized that the menu might be too 
  long to fit in a normal terminal screen (nine is set to 34 lines), so 
  I remade the menu. I also added a simple brightness routine; it adds a 
  set amount to the value of each pixel, with threshold limits for black 
  and white. It can also be bypassed. Also added pencam.h file.

* pencam-0.2, September 3, 2001. Winston Chang's unsharp mask filter is 
  included. Also, it is no longer necessary to enter the path/file name 
  on the pencam command line (just run "pencam").  The default is to write 
  the files (pencam00x.ppm) to the user's home directory.
  
* pencam-0.1, August 19, 2001. A few options added by Kevin Sisson. Added 
  option are: to download an individual image, a range of images, change 
  the download-to directory, change the base filename of the downloaded 
  pictures.

* (original version) pencam, ~June 2001, by Bart Hartgers. Basic program 
  to download all images from the camera to the computer. Bayer to RGB 
  image processing done.
  