Color Models: RGB and Lab
The RGB (Red, Green, Blue) model is the standard for sensors and displays. It's an additive model: mixing red, green, and blue at maximum intensity produces white.
The Lab model separates luminance (L) from chroma (a = green-red axis, b = blue-yellow axis). When editing underwater, working in Lab allows you to adjust colors without affecting the luminance.
Bit Depth: 8 bits (JPEG) = 256 levels = 16.7 million colors. 14 bits (RAW) = 16,384 levels = billions of shades. Essential for underwater image post-production.
Color Spaces: sRGB and Adobe RGB
| Characteristic | sRGB | Adobe RGB |
|---|---|---|
| Color Range | Standard (narrower) | Extended (+35% greens/cyans) |
| Main Use | Web, social media | Printing, post-production |
| Underwater Relevance | Final export | Capture and editing |
Underwater Application
The underwater world is dominated by blues, greens, and cyans, which is precisely the area where Adobe RGB offers the most nuances. Capturing in Adobe RGB (or RAW) ensures that you retain all the chromatic richness of the reef.