The colour summarizer will produce descriptive colour statistics for an image. Reported will be the average, median or mode, minimum and maximum of each RGB and HSV triplet element. Some of the questions the summarizer will answer are
I'm in the process of adding image statistics in LCH. LCH is the perceptually uniform equivalent of HSV, and defines colors using intuitive and perceptually-based luminance (perceived brightness), chroma (richness) and hue. If you are doing any kind of image analysis, it's likely that LCH will be much more useful to you than HSV or RGB.
To learn about LCH, see my presentation about color spaces and perceptual uniformity.
If you are a data geek, you'll be happy to know that XML or plain-text API output of the image statistics now includes RGB and HSV histograms, as well as individual pixel values. Munge away!
The purpose of this utility is to generate metadata that summarizes an image's colour characteristics for inclusion in an image database, such as Flickr. In particular this tool is being used to generate metadata for Flickr's Color Fields group.
(A) RGB histograms
(B) HLS histograms
(C) independent statistics for H/L/S
(D) representative HLS triplet
(E) independent statistics for R/G/B
(F) representative RGB value
Image statistics are computed using every pixel in the image. Therefore, analysis of images in which the background is dominant will be skewed by the background color. Specifically, statistics for product images (e.g. an items photographed on a white background) can be difficult to interpret. The answer to this is to mask areas of the image before carrying out statistics, but this is not implemented.