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Unified Color Model


UCT Studio is a tool for digital photography that implements full suite of HDR editing operations. Unified Color ModelTM (UCM) provides for this unique feature: all operations in UCT Studio work equally well for both traditional low dynamic range (LDR) as well as HDR imagery.

UCM presents a new powerful concept of image editing, whereas instead of non-intuitive, hard-to-master instruments like curve adjustment you manipulate natural aspects of a photograph — its brightness, contrast, saturation. Color Integrity, a distinctive characteristic of UCM makes it possible.

Color Integrity


Color Integrity means that when you perform an operation on brightness parameter, such as brightness, contrast, shadow, or sharpness adjustment in UCT Studio, this does not affect chromatic (color) components. Likewise, when chromatic change happens (in saturation or tint adjustment), image brightness and contrast are not affected. With conventional imaging model utilized by most of other imaging tools, each of these operations in fact change not one but all three parameters: adjustment of brightness also affects contrast and saturation, change of contrast leads to hue and saturation shift, and manipulation of saturation also changes image brightness. With LDR imaging, these problems aren't very noticeable because the range of color intensity is low. However with HDR photographs the problem of color shift becomes very apparent and it is the reason why traditional imaging paradigm is not suitable for HDR.

Another way to demonstrate the lack of integrity of the conventional model is to look at commutativity (dependence on order). It is easy to show that editing operations in the conventional model are not commutable — the result greatly depends on order of their execution. In UCM most operations are commutable and can be done in any order, giving the same exact result in the end. The image editing in UCT Studio is more predictable and best looking results can be achieved faster.

iBEF HDR imaging format


iBEF imaging format implemented by UCT Studio offers compression ratio, relative error and dynamic range characteristics unmatched by any other HDR image format solution. When compared to such known formats as Radiance HDR, Open EXR or Microsoft HD Photo, iBEF achieves up to 70% better compression ratio, while preserving image information with best precision, and providing dynamic range to match lighting conditions of any natural scene. For special mono-colored images, such as sepia or Black & White, the compression ratio benefit increases 3 times more — while competing formats show little to no advantages in this case.

iBEF Precision


iBEF implements a novel approach to control compression/quality factor of stored images — the quality setting in iBEF has a direct relation to physical properties of the encoded visual data. This parameter defines relative visual error or precision of data, unambiguously specifying how much colors may deviate from their original values. For example when you set iBEF precision at 1%, it is mathematically guaranteed that all colors in compressed representation will not differ more than 1% from the original. Conventional image compression formats typically offer a subjective quality setting that does not directly relate to color precision. The precision parameter of iBEF imaging format is an objective measure of image quality.

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UCT Studio 1.5.14 has been released
You can download it from here http://www.unifiedcolor.com/download.html

11 нояб. 2008 21:49
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