What makes a Colour - Control the strength of a colour

All the images in this section were taken at a shutter speed of 1/125 and an ISO rating of 250. All were shot as JPEG's to avoid any changes automatically applied when transferring a RAW image to Photoshop.
Readings were taken at the same spot in each image of  Hue(H), Saturation(S) and Brightness(B) and Red(R), Green(G) and Blue(B). The readings are provided after each image

The first image was taken at f11

H 228; S 2; B 88.    R 223; G 224; B 228.

The second at f14

H 230;  S 3;  B 75.  R184; G 183; B 189.

The third at f16 (this image is taken at the exposure as established using the camera's built in exposure meter.

H 266; S 4; B 67.  R 165; G 166; B 171.

The fourth at f20

H 240; S 4; B 58.  R 140; G 141;  B 146.

The fifth at f22

H 220; S 3; B 38.  R 94; G 98; B 99.

From the readings of the RGB scale the colour is largely 'neutral' and remains so throughout the changes in exposure. As one would expect the brightness(B) readings show a smaller number as the exposure decreases.