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112 Image Adjustments and Effects<br />
• Channel Mixer lets you modify a colour channel using a mix of the current<br />
colour channels.<br />
• Gradient Map lets you remap greyscale (lightness) information in the image<br />
to a selected gradient. The function replaces pixels of a given lightness in the<br />
original image with the corresponding colour value from the gradient<br />
spectrum.<br />
• Lens Filter adjusts the colour balance for warming or cooling down your<br />
photos. It digitally mimics the placement of a filter on the front of your camera<br />
lens.<br />
• Threshold creates a monochromatic (black and white) rendering. You can set<br />
the threshold, i.e. the lightness or grey value above which colours are inverted.<br />
• Equalize evenly distributes the lightness levels between existing bottom<br />
(darkest) and top (lightest) values.<br />
• Negative Image inverts the colours, giving the effect of a photographic<br />
negative.<br />
• Greyscale use for greyscale conversion with controllable source channel input.<br />
• Posterize produces a special effect by reducing the image to a limited number<br />
of colours.<br />
Besides the Brightness/Contrast adjustment, the <strong>PhotoPlus</strong> Image menu affords a<br />
number of functions you can apply to correct shadow/highlight values in an image.<br />
Adjust>AutoLevels or Adjust>AutoContrast may do the job in one go; if not, you<br />
can use Adjust>Levels... or Adjust>Shadow/Highlight/Midtone....<br />
Use the Histogram tab to display statistics and image colour values, helping<br />
you to evaluate the kinds of image adjustments that may be needed.
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