title: What color space is being used in Image Properties detection-Dominant Colors?
body: <p>I'm using Google Cloud Vision API to detect dominant colors in images for a personal project. As shown below, Vision API returned RGBA values, pixel fractions, and scores for each image I tested. I was wondering why Alpha values are always missing, and in what color space (sRGB, AdobeRGB, Apple RGB, etc.) should the RGBA values make most sense?</p>
  
  <p>{"colors": [{"color": {"red": 196, "green": 193, "blue": 193}, "score": 0.37683305, "pixelFraction": 0.013152561}, {"color": {"red": 237, "green": 235, "blue": 234}, "score": 0.3126285, "pixelFraction": 0.97964054},</p>