Sharpening of images

The sharpening of images following color conversion – e.g. from RGB to CMYK – is an important option for obtaining a “crisp” sharpness impression on the press. Therefore, the Options in ZePrA 3 offer the possibility of applying unsharp masking following color conversion.
Customers are given the choice of applying sharpening either to all image files, or to images in specific color spaces (e.g. only RGB and Gray images) and/or to downscaled images.
Choice of the unit of length of the Radius of unsharp masking (pixels, points or millimeters) makes it possible to optimize sharpening either for pixel images (radius unit: pixels) or for PDF files (radius unit: points or millimeters).
Note: The points or millimeters unit permits visually similar sharpening of images with different scalings and resolutions in PDF files.
Image scaling and sharpening can be combined as and when necessary.
Presets for typical, output-related sharpening tasks, e.g. moderate sharpening of all images, strong sharpening of RGB and Gray images or weak sharpening of all downscaled images, can be selected via a correspondingly named chooser.
In most cases, the built-in sharpening options eliminates the need to use external tools for later sharpening.