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      IWhen you save a mask, since it must be an 8-bit B&W file, it’s 
      fine to use a high quality jpeg file even when your original image is a 
      TIF file – this will save storage space. 
      These tools have created “black or white” masks that will apply 
      sharply different effects in the areas that are black from those that are 
      white. In some cases, you may want a soft or blurry mask to smoothly introduce 
      an image modification. The mask toolbox includes a blurring function you 
      can apply after creating a basic mask, and a feather tool to make a mask 
      expand or contract for better coverage of some images. 
      In other cases, you may want a mask to continuously vary an effect over
       an image where the variation is precisely related to the original image.
       This can be used for special tonal and color controls. Picture Window
      Pro  includes a Brightness Curve tool that creates a continuous tone mask
      based  on the tones of the image and tonal settings of a “histogram” 
      tool . . . 
      
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