BEF (image format)

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BEF is a proprietary file format from Unified Color, specially designed for High Dynamic Range Images. The DIF format stores image information based on the human vision (complete gamut), whereby the range of contrast within an image by any natural scene can be represented. This DIF files are free from the so-called clipping, ie the conversion of all tonal values ​​lying above or below a certain gray level in White Black respectively. BEF supports both the 32-bit floating-point architecture, with 96 bits per pixel and encoding the integer of 32 bits per pixel.

Another feature of the compression. In contrast to most of the formats of the image caused by the compression quality loss of an objective quality metric coupled with the BEF- format. Instead, the image quality subjectively define between "low" and " high," Unified Color accesses the differential visibility threshold. This allows the image compression on a scale of 0.1 to 5 visible errors adjust. A value of ≤ 1.0 means that perceived by the human eye difference is equal to or up to the threshold of the visible distinctness. In other words, with the naked eye, no difference will appear. A value of> 1.0 represents the factor of the visible distinctness