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The Story

The Story

Chapter 1.Revolutionary CMOS Sensor

The power of the revolutionary "X-Trans CMOS" sensor
which delivers premium image quality that “outperforms
that of full-size SLRs”

No moire if you remove the regular repeating pattern structure…
"Innovative color filter array" inspired by the structure of, and our heritage in, photographic film

・A moire pattern occurs when a subject with a "repeating pattern" is received by a sensor, which is a "cyclic array".

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・"Why does moire occur in photos taken with a digital camera when it never appears in photos taken with a silver halide film camera that does not includes optical low pass filters?"
That is because silver halide particles that make up photographic film form a random pattern. Silver halide particles are an organic compound and naturally have an irregular configuration.
Reproducing and achieving low periodicity, seen in silver halide particles on photographic film, with a digital sensor, can prevent moire without having to use optical low-pass filters. This results in the delivery of the highest resolution images.

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4pixel = 2 x 2
Bayer Array
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36pixel = 6 x 6
X-Trans CMOS

・Color filters generally used in today's sensors use the Bayer array. It is a highly periodic array of 2x2 (4pixel) grids consisting of one R (red), two G (green) and one B (blue) pixels, arranged in a regular pattern.
A new 6x6 grid has been newly developed for the X-Pro1 to break the cyclic nature of the 2x2 array. It has 36 pixels (6x6), creating a highly complex combination compared to Bayer's 4 patterns to dramatically reduce the regularity of the regular repeating pattern. It has been found that the complexity of this array is sufficient to fundamentally prevent the development of moire in most cases.

The secret of the color filter array that prevents moire and false colors

X-Trans
CMOS
R filterR filter G filterG filter B filterB filter
Bayer
Array
R filter G filter B filter

・A sensor receives light, uses the three RGB filters for color separation, and performs interpolation based on the correlation of adjacent pixel information to create a color image. In the Bayer array each row or column features only 2 of the 3 R,G or B filter pixels. In developing the new color filter array, Fujifilm ensured that all rows and columns are laid out with R, G or B filter pixels resulting in more realistic and accurate color representation and removal of ‘false color’ ・Incidentally, G (green) pixels is largest in number in this color filter array. Fujifilm focused on G (green) pixels because green has the highest sensitivity ( Ie is the most easily recognized by human eyes) in the visible spectrum. The new color filter array also has a balanced mixture of R (red) and B (blue) to enable natural color reproduc-tion close to what human eyes see.

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