Blue channel usually worse, due to the chip. But why?

Hi, I have another fundamental question, thanks for reading.

Using Photoshop for many years, I learned that it's usually the blue channel that shows the most noise in an RGB image. I think the best way is usually green, followed by red. Similarly, the human eye is better suited for a green world (plants) with the addition of red (fruit) at a relatively late stage in evolution. Blue isn't that therfore important, it isn't so bad when the blue layer is worse than the other two. Correct so far?

Now the question is, why not make the chip just as good for all channels? Is it cheaper to do some bad, blue, that the three parties just as good? I guess that's the sensors causing the difference it quality. It's a question of costs, all channels would be equal in quality theoretically?

Thanks for your advice!

Just raise the sensors (leaving aside the lossy compression and JPEG):

They make the chip out of everything as good.  But there are a lot of factors in competition.

Silicon sensor is more sensitive in areas less sensitive to blue and green and red.  It is even more sensitive to infrared and needs a filter to reduce infrared to keep the image to the correct search (otherwise fire fate of magenta :-).

And the model of typical Bayer sensor has 2 green sensors for each red and blue: RGBG

This puts red and blue in a disadvantageous position, but the Red is more sensitive.

Fortunately, your eye is also less sensitive to blue, so the Silicon sensor ends work similar to the way that your eye doesn't.

You need exposure time, or a very different sensor for quality equal across all channels.

And, with the exception of scientific imaging, there is not much need.

Tags: Photoshop

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