Imagener Image Enlarger
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HOW TO MAKE ENLARGEMENTS SHARPER

Humans have a tendency to interpret the photos, pictures and especially digital images as somewhat "soft" or out-of-focus. Intuitively scanning photos at a very high resolution should sharpen our perception, but that's not the case. All scanned images need moderate sharpening, even those scanned on high-end scanners. This fact is well known in the printing and graphics arts industries. These industries have vastly improved image sharpening over the years. Think about it for a moment. Old photos and movies were much 'blurrier' than those we enjoy today.

"Unsharp masking" is the term developed to describe a technique that printers and graphic artists use to sharpen images by emphasizing differences between adjoining areas of significantly different hue or tone.


Original Image - Image Before Resharpening with Imagener
When the original is rescanned with this mask, there is an increase in the degree of contrast at the boundaries where significant content changes in the image. These are called tone shifts. Tone shifts have varying degrees strength themselves depending on whether the content is gradually changing from one result to another, or whether the content change is abrupt. Applying Imagener's Resharp function (an "unsharp mask" operation in professional terms) to the most highly detailed areas of an image always increases picture sharpness and visual optimization.

Image After Unsharp Mask
Experiment:
Arrange your screen so that you can see both images at once. Notice the detail in the green hillsides that are blurred in the original above. Also notice the detail in the road in the distance that is less detailed in the original.
Imagener Professional and Unlimited have this Resharp function built in. The following is a somewhat technical description of the 3 parts of this function. NOTE: This is for reference only - notice the "Auto" checkbox in the image to the right. Checking this allows you to move the sliders and automatically see and adjust results.

There are three settings for Imagener's Resharp function and knowing something about them can help when you are adjusting your image even in automatice mode. If you look at the main Imagener screen at the "Resharp" section, these 3 functions are Amount, Radius and Threshold.

Amount refers to the intensity of the resharpening effect. A setting between 100% and 200% will do, depending on the Radius. The bigger the Radius, the less Amount needed. We've found that a "standard" Amount setting is 120% however, some images need more than this, and others less.

Radius refers to the dimension, in width, of every sample that will be affected by the Resharp part of the function. Choose a setting between 1 and 1.5, depending on the image resolution. The higher the resolution of the image, the greater the setting should be for the Radius value.

Complex images will optimize with very different settings than images with simpler content. For example, designate a Radius of 1 for a 200 dpi (dots per inch) image. Designate a radius of 1.5 for a 300 dpi image. The more Amount you use, the less Radius is necessary.

Threshold specifies how many numbers of samples in an image will be sharpened. A setting of 0 will affect every sample, whereas a setting of 50 will affect almost none of the samples. Highly detailed images such as line art require a setting of 3, whereas portraits look best with a setting of 5 to 9.

It can take a while to come up with the right combination of settings for an image. That's why many photo software programs offer some form of sharpening as an option during image capture, and most commonly this functionality is the industry standard "Unsharp Mask" functionality only without automatic viewing found in the Imagener product line.

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Imagener intelligently analyzes wide image areas around each pixel to precisely enlarge images.

Imagener Image Enlarger
Imagener Enhanced uses the Kneson Progressive enlargement engine to analyze pixels and calculate a gradient color spectrum matrix, then performs enlargement based on color gradient changes. Imagener Enhanced produces 200-300% enlargements without quality loss.
All the features of the Enhanced version plus our revolutionary Kneson Progressive++ Enlargement Engine - an interpolation technology that goes far beyond methods used by other photo programs costing hundreds of dollars. Amazing enlargements appear from your digital images. Allows enlargements greater than 300% without pixel quality loss.
Resharp Function
Professionally sharpen picture enlargements and further enhance images using Imagener Pro's resharpening function.
Sharpen Using Slider Bars:
Imagener Pro's resharpening function
Imagener Unlimited - the world's first raster to vector enlargement technology contains all of the features of:
. Imagener Enhanced
. Imagener Professional
...plus Kneson Software's revolutionary Kneson Unlimited++ enlargement engine that converts pixels into vectors for enlargement then back into unlimited enlargements.*
*limited only by computer memory

Behind-the-scenes
Vector
Conversion:

Pixels are converted to vectors for smoother image enlargement
Imagener Unlimited vector display example image
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