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By V. Ryaben'kll, S. Tsynkov

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When b0 > g 0 , the angle lies in the interval [π , 2π ], leading to ϕ H ( x , y ) = 2π − ϕ H ( x , y ). Note that when the intensity is zero, that is, f R ( x , y ) + fG ( x , y ) + f B ( x , y ) = 0, saturation does not make any sense. On the other hand, when the saturation is zero (the white point), the hue does not make any sense. When the hue is zero, it represents red, and 23 π represents green and 2π represents blue. 2 Conversion from the HSI Model to the RGB Model Conversion of a colour image from the HSI model to the RGB model is carried out in the colour triangle first.

1 Conversion from the RGB Model to the HSI Model The formulae used to convert an image from the RGB model to the HSI model are presented here [7]. 9 lies in the interval [0, π ]. However, in the colour triangle, the angle of a colour P with respect to red colour (the angle between PW and RW) can be found as an arbitrary value in the interval [0, 2π ]. In practice, the size of the angle is determined by g the proportion of each colour in its intensity, that is, b0 = ϕbI , g 0 = ϕ . 9. When b0 > g 0 , the angle lies in the interval [π , 2π ], leading to ϕ H ( x , y ) = 2π − ϕ H ( x , y ).

Raw is usually used to keep records of electronic level produced when image sensors (charge-coupled device [CCD] or complementary metal-oxide semiconductor [CMOS]) transform light signals into electric signals. The image data stored in the RAW file is just the digitised electric signals captured by a camera image sensor such as CCD. A typical RAW file contains uncompressed or unprocessed pixel data. RAW format files save the information regarding the best-quality images captured by a CCD that is rich enough for processing later.

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