4 ms·

> The human eye is most sensitive to green light, This argument is very confusing: if is most sensitive, less intensity/area should be necessary, not more.

by f1shy 10mo ago

gudzpoz 10mo ago
Note that there are two measurement systems involved: first the camera, and then the human eyes. Your reasoning could be correct if there were only one: "the sensor is most sensitive to green light, so less sensor area is needed". But it is not the case, we are first measuring with cameras, and then presenting the image to human eyes. Being more sensitive to a colour means that the same measurement error will lead to more observable artifacts. So to maximize visual authenticity, the best we can do is to make our cameras as sensitive to green light (relatively) as human eyes.
- f1shy 10mo ago
  Oh you are right! I’m so dumb! Of course it is the camera. To have the camera have the same sensitivity, we need more green pixels! I had my neurons off. Thanks.
Lvl999Noob 10mo ago
Since the human eye is most sensitive to green, it will find errors in the green channel much easier than the others. This is why you need _more_ green data.
matsemann 10mo ago
Yeah, was thinking the same. If we're more sensitive, why do we need double sensors? Just have 1:1:1, and we would anyways see more of the green? Won't it be too much if we do 1:2:1, when we're already more perceptible to green?
- seba_dos1 10mo ago
  With 1:1:1 the matrix isn't square, and if you have to double one of the channels for practical purposes then the green one is the obvious pick as it's the most beneficial in increasing the image quality cause it's increasing the spatial resolution where our eyes can actually notice it. Grab a random photo and blur its blue channel out a bit. You probably won't notice much difference aside of some slight discoloration. Then try the same with the green channel.
afiori 10mo ago
Because that reasoning applies to binary signals, where the sensibility is about detection, in the case of our eyes sensibility means that we can detect many more distinct values let's say we can see N distinct luminosity levels of monochrome green light but only N*k or N^k distinct levels of blue light. So to describe/reproduce what our eyes see you need more detection range in the green spectrum

> The human eye is most sensitive to green light, This argument is very confusing: if is most sensitive, less intensity/area should be necessary, not more.

by f1shy 10mo ago

> The human eye is most sensitive to green light, This argument is very confusing: if is most sensitive, less intensity/area should be necessary, not more.

gudzpoz 10mo ago

Note that there are two measurement systems involved: first the camera, and then the human eyes. Your reasoning could be correct if there were only one: "the sensor is most sensitive to green light, so less sensor area is needed". But it is not the case, we are first measuring with cameras, and then presenting the image to human eyes. Being more sensitive to a colour means that the same measurement error will lead to more observable artifacts. So to maximize visual authenticity, the best we can do is to make our cameras as sensitive to green light (relatively) as human eyes.

f1shy 10mo ago
Oh you are right! I’m so dumb! Of course it is the camera. To have the camera have the same sensitivity, we need more green pixels! I had my neurons off. Thanks.

Lvl999Noob 10mo ago

Since the human eye is most sensitive to green, it will find errors in the green channel much easier than the others. This is why you need _more_ green data.

matsemann 10mo ago

Yeah, was thinking the same. If we're more sensitive, why do we need double sensors? Just have 1:1:1, and we would anyways see more of the green? Won't it be too much if we do 1:2:1, when we're already more perceptible to green?

seba_dos1 10mo ago
With 1:1:1 the matrix isn't square, and if you have to double one of the channels for practical purposes then the green one is the obvious pick as it's the most beneficial in increasing the image quality cause it's increasing the spatial resolution where our eyes can actually notice it. Grab a random photo and blur its blue channel out a bit. You probably won't notice much difference aside of some slight discoloration. Then try the same with the green channel.

afiori 10mo ago

Because that reasoning applies to binary signals, where the sensibility is about detection, in the case of our eyes sensibility means that we can detect many more distinct values let's say we can see N distinct luminosity levels of monochrome green light but only N*k or N^k distinct levels of blue light. So to describe/reproduce what our eyes see you need more detection range in the green spectrum