Monday, June 20, 2011

Optical Filters and Light Modifiers for Forensic Imaging in the Visible Spectrum

From Jason Schneider via Forensic Mag:

"... The scientific capabilities of the latest versions of Adobe Photoshop are considered by many forensic photographers to be the gold standard of post-production image control. Photoshop is often used to split out individual R, G, B color channels for image analysis, and many advanced users cite the mechanics of the workflow and multiplicity of possibilities as advantages of this huge and complex system. However, there are other filter emulation and software effect systems that are more intuitive and may even offer useful capabilities that are less cumbersome than Photoshop. A good example is Tiffen Dfx, which provides 113 different filter selections in the Version 2 Standalone and is available as a plug-in for Photoshop or Aperture 2.1.

In its Image Tools & Effects, Dfx provides an EZ Mask tool that lets you easily isolate any specific area of the subject to which you want to apply effects, plus a Color Correction tool that allows you to separately adjust hue, saturation, and brightness, shadows, mid tones, and highlights, as well as gamma, red, green, and blue. You can also apply a black-and-white filter, select filter options, and then dial in the appropriate color channel until the details you want to accentuate are clearly visible. Can you do these things in Photoshop? Yes, but for most users it’s easier and faster in Dfx because it provides an intuitive user interface plus filter parameters that closely match traditional optical filters. Indeed, many CSI units are currently using this software ..."

Click here to read the whole article.


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