Imagener Professional $49.95

Resharp Function Sharpness Control

All digital images can benefit from being sharpened at some stage in their lives. This is especially true for enlarged images, but enlarged or not, all captured images - digital or analog - suffer from blurring or softening of detail in some way. This is precisely the motivation behind Kneson Software's addition of the Resharp function in Imagener Professional and Imagener Unlimited. However, our customers have been asking for more information about this function as use of it does require a certain level of skill and knowledge to master. Blurring occurs when the representation of an object is at a lower contrast or retains less detail than is present in the original. Sharpening compensates for this loss by improving the visibility of the information in the image. It works by applying a matrix of numbers over an array of the pixels in the image with the matrix centered over one pixel at a time. Sharpening can add image data that improve the appearance or impression of sharpness. This function is formally known as "Unsharp Mask." We named it "Resharp" to avoid any confusion, but the technique is actually a darkroom technique for improving the sharpness of paper prints that was used before the age of digital pictures. There are three variables to the function, Amount, Radius, and Threshold. Each variable interacts with the other so it is possible to obtain nearly identical effects with very different settings. Keep the following characteristics in mind:

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This one is recommended for Sublimation

Imagener Professional also has resharping functionality built into the Imagener user interface. This Resharp filter is similar to the methods used to sharpen film images.

Amount

· A measure of the strength of sharpening, roughly as a percentage of the increase in edge contrast. · Works best within the 50-200% range (enter 50 up to 200 in the amount box in Imagener).
Radius
· A measures of the number of pixels over which the function operates. · Needs to be set with care as radius has the greatest effect. · A radius of three may in fact cover seven or more pixels. · In general, low figures give crisp edges; larger figures produce broader edges, and increase overall contrast.
Threshold

· Measures the minimum difference between two boundaries that the function will operate on. · Is based on 255 levels and therefore will only accept a numerical value of 0 to 255. · Zero threshold tells the function to operate over the entire image. · A value of 127 (about half of the 255 levels) will cause sharpening to occur only where pixels are next to other pixels that are 50% lighter or darker.

1-800-886-3331

SEPS GRAPHICS INC.   103 Trade Center Drive   Birmingham, Al 35244
1-800-886-3331    205-444-5554    fax  205-444-5545
info@sepsgraphics.com

A full graphics and sublimation supplier
www.sepsgraphics.com