I know that several of these values can be derived through photoshop, but it seems like it would need to be done manually for each image file.
What I'm interested in is a resource that I can give several image files (~300) and get measures of things like mean luminance, colour balance etc., in an automated fashion.
As a followup, you can maybe tell that I don't have a clear vision in mind of which measures I would like to get of the images. I'm curious what is out there? I'm interested in any variables that capture aspects of the image: luminance, symmetry, saturation, colour balance etc. I'd love to hear about any others that you'd recommend. Of course as a caveat, these should be easy to extract, using an automated process like I mentioned.