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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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