Post Scanning Color Correction and Sharpening

Reference Guide

DO NOT USE INTERPOLATED RESOLUTION OF YOUR SCANNER TO COM- PUTE IMAGE SIZE

Most 300 dpi scanners can interpolate or “imitate” 600 dpi scanning. This is really not really scanning at 600 dpi and will degrade the image quality. When scanning, ensure that you are using the scanner's true optical resolution, not its interpolated resolution. Scan- ning at the highest optical resolution (300 dpi) is better than scanning at the scanner's highest interpolated resolution (600 dpi).

5. Post Scanning Color Correction and Sharpening

All scanned images, even those scanned on expensive drum scanners, must be color corrected and sharpened before using them for a large-format inkjet print. If you are using a service bureau for scanning images, their scanner operator will usually do this as part of the scanning fee. However, you should always check the image before using it. Although the process of color correction and sharpening is more detailed than can be explained within this document, the following outline will give you a good grasp of what is required:

Color Correction - all scanners give the image a slight color cast during the scanning process. This happens because all light sensing devices have a slight bias. The easiest way to correct most of this color cast is to use a function such as Auto Levels in PhotoShop. This function finds the whitest pixel and the darkest pixel in an image and distributes all colors in-between. This works well on 75% of all images that are properly exposed. In very dark night scenes or in very white snow background scenes, Auto Levels does not work properly and the correction must be made manually using histo- gram adjustments.

Sharpening using UnSharp Mask - all scanned images, even images scanned on the most expensive drum scanners, need to be sharpened. The best digital tool to do this with is a function called an unsharp mask (available in programs such as PhotoShop). An unsharp mask basically redefines the edges of images by adding a mask. Most unsharp mask tools allow you to set the pixel width of the mask and the amount of sharpening. A good start is to use a pixel width of 3 - 5, with an amount of 75%. Too much unsharp mask will give the whole image a hard, pixelated look. A little more unsharp mask can be used with inkjet images as they are somewhat diffused in the printing process, hiding any small amounts of oversharpening.

Introduction 1-7

4800 specifications

The Kodak 4800 is a significant addition to the world of digital photography, blending advanced technology with user-friendly features to capture stunning images. This camera is well-suited for both amateur photographers and seasoned professionals, catering to a wide range of photographic needs.

One of the standout features of the Kodak 4800 is its impressive resolution. With a powerful 48-megapixel sensor, users can achieve remarkable image clarity and detail, making it perfect for large prints and high-quality displays. The camera excels in various lighting conditions, thanks to its advanced ISO range, which allows for stunning low-light performance while minimizing noise.

The Kodak 4800 incorporates a versatile zoom lens, providing users with the flexibility to capture a variety of scenes, from expansive landscapes to close-up portraits. With optical zoom capabilities that offer a focal range suitable for multiple genres of photography, this camera is an all-in-one tool for budding and professional photographers alike.

In terms of technology, the Kodak 4800 features an intuitive touchscreen interface, making navigation straightforward and enjoyable. The menu system is designed to be user-centric, allowing quick access to essential settings and modes. This is complemented by built-in Wi-Fi and Bluetooth connectivity, which enables seamless sharing of images and remote control capabilities via smartphones.

Another hallmark of the Kodak 4800 is its robust video capabilities. The ability to record in 4K resolution allows for stunning footage that captures the action in vivid detail. Whether filming a family gathering or a professional event, users can rely on the camera’s comprehensive video features.

The Kodak 4800 also includes various shooting modes and filters, enabling users to experiment creatively. From stunning time-lapse sequences to slow-motion effects, the camera encourages exploration of different artistic expressions.

Battery life is another critical aspect of the Kodak 4800, with efficient power management ensuring users can shoot for extended periods without worry.

In conclusion, the Kodak 4800 stands out for its combination of high-resolution images, versatile zoom capabilities, user-friendly interface, strong video functionality, and innovative technologies. This camera appeals to a diverse audience, promising to enhance the photographic experience and inspire creativity.