(Actually, I've slightly exaggerated the moires to account for any printing anomalies but believe me, with or without enhancement, the image is a mess on screen.) The middle example shows the same image subject to the Dust & Scratches filter with a Radius of 2 and a Threshold value of 20. The top example in the color plate shows the original scanned image with its awful moires. I've blown up a detail in each image so that you can better see the pixels in the moire pattern. The left half of Color Plate 10-7 shows the individual color channels in the image the right half shows the full-color image. (Because I created the original image, Macworld probably won't sue me, but you shouldn't try it.) This figure features an image scanned from a previous issue of Macworld magazine. But this also goes a long way toward eliminating the actual image detail, as shown in Color Plate 10-7. The Dust & Scratches filter can be pretty useful for eliminating moires, particularly if you reduce the Threshold value below 40.
#REMOVE HALFTONE GRAPHICCONVERTER FREE#
It's up to you to make sure that the image you scan is no longer protected by copyright - most, but not all, works over 75 years old are considered free game - or that your noncommercial application of the image falls under the fair-use umbrella of commentary or criticism.
In most cases, the halftone pattern clashes with the resolution of the scanned image to produce rhythmic and distracting moires.Ĭaution When scanning published photographs or artwork, take a moment to find out if what you're doing is legal. See, any time you scan a printed image, you're actually scanning a collection of halftone dots rather than a continuous-tone photograph. These patterns appear when scanning halftoned images from books and magazines. But another problem that the filter may be able to eliminate is moire patterns.
Now, as I say, Dust & Scratches was designed to get rid of gunk on a dirty scanner. Just hunker down and eliminate the imperfections manually using the rubber stamp tool, as explained in the "Touching up blemishes" section of Chapter 7. But if it doesn't work (as it probably won't), don't get your nose out ofjoint.
#REMOVE HALFTONE GRAPHICCONVERTER CRACK#
I'm not saying that you shouldn't ever use it - in fact, you may always want to give this filter the first crack at a dusty image. Figure 10-45: Here you can see the difference between sharpening a digital photograph right off the bat (top) and waiting to sharpen until after you've prepared the image with Median, Gaussian Blur, and Unsharp Mask (bottom).īut like so many automated tools, this one works only when conditions are favorable. As long as the offending imperfection is smaller or thinner than the Radius value and different enough from its neighbors to satisfy the Threshold value, the filter deletes the spot or line and interpolates between the pixels around the perimeter. The filter offers two options, Radius and Threshold. The purpose of this filter is to remove dust particles, hairs, scratches, and other imperfections that may accompany a scan. Photoshop offers one additional filter in the Filter ^ Noise submenu called Dust & Scratches.
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