Nikon 9235 Reference Manual - Page 86
Making Edges More Distinct, Unsharp Mask, For more information
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Making Edges More Distinct Unsharp Mask Unsharp Mask is used to increase the sharpness of images by making edges more distinct. Unsharp Mask works by increasing the contrast of the edges in the image while leaving other areas untouched. The degree of sharpness is determined by three factors: intensity, halo width, and threshold. • Intensity... ...is the amount the contrast of edges will be increased. Unsharp Mask can be applied to all the colors in the image or selectively to areas of the image in which red, green, blue, cyan, magenta, or yellow are judged to predominate based on the color information for each pixel. The brightness (luminosity) of the affected pixels is adjusted to sharpen edges without altering color balance. Using the controls in the Unsharp Mask palette, you can create multiple masks, one for each color or all colors and each with different values for intensity, halo width, and threshold. • Halo width... ...controls the width of the edges in the image after editing. The greater the halo width, the wider the edges in the sharpened image will appear. Too large a value for halo width will produce a "halo" along edges in the image. • Threshold... ...defines the limit at which sharpening will be applied. If the threshold is zero, sharpening will apply to all edges in the image. Increasing the threshold increases the amount of contrast that must be present between pixels before Unsharp Mask will be applied, with the result that only more distinctly contrasting edges will be affected. Unsharp Mask sharpens edges without affecting color balance by making adjustments only to luminosity (brightness). The effect is the same as performing Unsharp Mask with the Luminosity channel selected in the Adobe Photoshop Lab color model. The amount of Unsharp Mask you will need depends on the size and resolution of the final image. The more pixels in the image, the greater the amount of Unsharp Mask you will need to achieve the same degree of apparent sharpness. Before applying an Unsharp Mask, scale the image to the desired size and resolution. Unsharp Mask can only be used when the Nikon Color Management system (CMS) is on. If Nikon CMS is off, the tools in the Unsharp Mask palette will be disabled. Pg. For more information on: 46 Resolution and size 107 Nikon CMS Reference:The Tool Chest 85
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