X-Trans is NOT Random

Started Sep 8, 2012 | Discussions thread
CraigArnold
Contributing MemberPosts: 525Gear list
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In reply to rattymouse, Sep 9, 2012

rattymouse wrote:

Fujifilm keeps reffering to the X-Trans sensor's layout as random. For example:

"The unique random arrangement of the [X-Tran's] colour filter array is also highly effective in enhancing noise separation in high-sensitivity photography."

This is nonsense. Anyone who looks at the X-Trans sensor can see that it is made up of a repeating/ pattern of RGB. In other worse, if you see one unit (pixel) of the sensor, you can "draw" the whole sensor, over and over and over again. If the sensor were truly random, you would not know what the next unit would look like. The X-Trans is not at all random, it just has a different layout than the Bayer pattern.

sigh Really?

They are trying to explain to the (mathematically illiterate) public what is different about the CFA. When they go beyond the single-line explanation, they include qualifiers:

"Moiré is tackled at its root cause by the innovative color filter array of the new sensor. By enhancing the aperiodicity (randomness) in the array arrangement, the color filter minimizes the generation of moire and false colors, eliminating the necessity for an optical low-pass filter ....

3. Inspired by the natural random arrangement of the fine grains of silver halide in film.
....

The high aperiodicity (randomness) of the arrangement of pixels in 6x6 sets reduces the occurrence of moire. Also the presence of an R, B and B pixel in every vertical and horizontal pixel series minimizes the generation of false colors and delivers higher color reproduction fidelity."

So, if you object so strongly, perhaps you could help out their marketing department. Of course the Fuji engineers would be more comfortable with "higher aperiodicity" or "increased measures of entropy" but the marketing team told them that people would just be confused. "Randomness" is NOT INACCURATE in the context of a single-line marketing tag summary of what the engineers are trying to achieve.

A natural language is not very good at clearly expressing mathematical concepts. I would suggest that you might want to do some study In both the field of mathematics that deals with randomness and the linguistic field of discourse analysis - which is the analysis of meaning of words and sentences in their context.

As a decent and rational person, I'm sure you will soon be posting a heartfealt apology to Fujifilm.

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