so in human sight the color 00ff00 is usually looks much brighter than the color 0000ff

Yes, in human visual perception, the color represented by 00ff00 (green) often looks much brighter than 0000ff (blue). This is influenced by various factors: 1. **Spectral Sensitivity**: The human eye has peak sensitivity at wavelengths around 555 nm corresponding to yellow-green light. Green is close to this range, while blue is further away on the spectrum. 2. **Photoreceptor Response**: The green-sensitive cone cells (M-cones) have a broader and stronger response curve compared to the blue-sensitive ones (S-cones). They're also more abundant relative to other cones. 3. **Brightness Perception**: Our brain interprets different frequencies as having varying perceived brightness. Blue light might be scattered or absorbed more in the atmosphere or medium, leading to the perception of it being dimmer. 4. **Natural Environment Association**: The prevalence of green plants and foliage could make our visual system more attuned to green shades. 5. **Color Contrast**: Green contrasts well with its surrounds under typical environmental lighting. This contrast enhances its perceived brightness. 6. **Cultural Factors and Expectations**: Some cultural contexts may associate green with freshness or vibrancy, influencing how we perceive its intensity. 7. **Adaptation**: Over time, our visual system may adapt by enhancing signs of life and growth, such as green hues, making them seem more prominent. These factors combined contribute to the subjective experience where 00ff00, with its green tint, appears brighter and 'more alive' than 0000ff, which usually looks darker and cooler. However, individual differences can also play a role in such color and light perceptions.