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  As I said, we'll get to cover some tools that will adjust the colors for
 an image. This kind of operantions are needed when you want to, say, 
 improove the quality of a picture taken durring the night. Another 
 situation is when you try to make a skin and you want to apply a cammo pattern.
  So, going 'Tools'->'Color tools' you'll find:

  a. Color Balance
  First tool to be studied under the microscope is 'Color Balance':

   

   As you can see, from an image, you can adjust the color balance for three
  ranges: highlits, midtones and ('Umbre' stands for 'shaddows') dark tones.
  If you don't have a selection made, the changes will apply to the whole image.
   Not to worry, unless you check-off the 'Preview' check-box, you'll see what
  you're doing.

   b. Hue-Saturation ...
   The HSL color model uses Hue to say what is the color, saturation to
  show how much of the pure color is mixed with white and lightness to
  represent the overall luminosity of the color.
   The second tool (and probably my favourite) is 'Hue-Brightness'. I've made
  heavy use of it while making a small skin pack (my first and last skin pack
  if I recall ...) to place some cammo patterns:

  

   Now because I was trying to make some urban cammo patterns, I didn't modify
  the hue too much; instead I drove down the saturation and increased the
  lightness of the free-selected regions. For a jungle cammo, I would have
  changed the hue until the regions turned from grey to green.
   Just like the previous tool, if you have no selection, the changes will apply
  to the whole image. Again, you will have a preview ...
   Again, just like 'Color Balance', you can alter only one channel (the red one
  for example. This way, you'll shift the color only for the red regions. Same
  thing for the other channels (cyan, magenta, blue, green etc.). The 'Master'
  button will make sure that all the changes will apply to all channels.

   c. Colorize
   It looks a lot like the previous. This time, you won't be able to specify
  what channels should be altered:

  

   Again, it can work over a selection or, if no selection has been made, over
  the whole image. To be honest, I've never used it :).

   d. Brightness-Contrast

   

   Except the Romanian titles, this is one of the easiest to explain tool: two
  sliders, one controlling the brightness and the other one the contrast. Now 
  when increasing the brightness of a picture, you should also consider 
  increasing the contrast; otherwise, you'll end up with a 'milky' picture.

   e. Threshold

   

   This tool will turn your image black & white. Every pixel between those two
  thersholds will turn white. Everything below the threshold will turn black.
  That easy.

   f. Levels...

   

   This one alows you to constrain the luminosity levels between some limits
  you choose. Haven't used this one either.

   g. Curves...

   

   This is a good one! It also alows you to change the levels of luminosity;
  however you'll get the chance to draw the transfer ecuation for the filter!
  You can choose a nice rounded curve, or free-hand. I went for a free-hand
  there ... This could get in handy when you want to strech the contrast for
  some level intervals only.

   h. Posterize...

   

   The picture says it all. It will reduce the numbers of colors used. Might
  get in handy when you try to make some realy small files.