unsharp masking


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unsharp masking

(un-sharp ) A process for amplifying fine detail in the image on a photographic plate. A positive contact copy is made through the glass on low-contrast film. The copy is blurred, containing only the large-scale features of the original image; this is the unsharp mask. When placed in contact with the back of the plate, it effectively cancels out the large-scale features, revealing the fine detail on the plate.
References in periodicals archive ?
The unsharp masking and wavelet sharpening image-processing algorithms mimic very closely the edge enhancement that occurs in the eye-brain's neural network.
Ensuing chapters discuss techniques such as multimodality imaging, nonlinear unsharp masking, wavelet-based feature extraction, fractal analysis, image reconstruction, and other interpolative procedures in the detection of breast, skin, and prostate cancers.
This book demonstrates Malin's technical skill, notably with some prints processed using unsharp masking, a very difficult process, not just the few 'mouse clicks' of today.
His darkroom techniques include dodging, burning, multiple filtration, flashing, bleaching, unsharp masking - anything it takes to make the image come alive.
Whether you are facing the arcane art of offset printing for the first time, a layout person trying to optimize the page without offending or a technology-driven person anxious to know absolutely everything about dot grain, there is no doubt Breede covers it, along with paper issues (including basis weight, M weight, ream weight, equivalent weights of paper, bulk determination, cubic area of skids or rolls), print calculations (such as total dot gain, density, opacity, printing cylinder calculations, color spaces and color calculations), prepress (including file size, scanning resolutions, unsharp masking and gray levels) and common conversions, including nonmetrics to metrics.
Similar to the Kodak software, Capture One is for processing RAW image files and provides a range of image adjustments, such as gray balance, levels/curves, contrast, crop, sizing, and unsharp masking.
When we applied a digital unsharp masking algorithm (in MetaMorph, Universal Imaging Corp.
To reveal the details of regions so bright that they appear washed out on a standard photograph, Malin uses a technique called unsharp masking.
I typically end up with about a dozen layers, including ones for unsharp masking, high-pass filtering, and color saturation.
In Unsharp Masking, Photoshop users have three adjustments-Amount, Radius, and Threshold.