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Article ID: NGN1133 — Created: 28 Jan 2018 — Reviewed: 11 Mar 2018
On occasion, deep zoom images may exhibit artifacts that make each field clearly apparent. While the effect is not visible on an individual field, the repeating pattern visible in a scanned region of interest is dramatic and distracting.
These artifacts are generally referred to as flat-field effects. They are caused by a gradient (or lack of flatness) in the illumination field and are caused by any of a number of things. Fortunately, the level clipping filter can be used to mitigate many flat field issues.
Using the Level Clipping Filter is very effective. But, it requires a number of steps to complete. You must first, determine the proper white clipping level. Then, you must create a Deep Zoom filter sequence using that level. And, finally, you must create a new deep zoom image from your scan using the newly created filter.
You may wish to adjust the Deep Zoom filter settings to better suit your taste in image quality. If so, open the Deep Zoom Filter from the Filter Manager and adjust the filter settings. You may also add additional filters (like brighten, contrast, gamma, or sharpen) to the sequence.
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