Here's another idea: encode color mixes as one RGB value (32 bits) and sort according to those values. To find the closest color is like finding the closest points in the color space. It would be like a distance search.
70% black #000000 = 0 20% gray #f0f0f0 = #303030 10% brown #8b4513 = #0e0702 = #3e3732 The distance would be: sqrt( (r1 - r0)^2 + (g1 - g0)^2 + (b1 - b0)^2 ) Where r0g0b0 is the color the user asked for, and r1g1b1 is the composite color of the item, calculated above. --Renaud -----Original Message----- From: Steven Rowe [mailto:[EMAIL PROTECTED] Sent: Friday, September 28, 2007 7:14 AM To: solr-user@lucene.apache.org Subject: Re: Color search Hi Guangwei, When you index your products, you could have a single color field, and include duplicates of each color component proportional to its weight. For example, if you decide to use 10% increments, for your black dress with 70% of black, 20% of gray, 10% of brown, you would index the following terms for the color field: black black black black black black black gray gray brown This works because Lucene natively interprets document term frequencies as weights. Steve Guangwei Yuan wrote: > Hi, > > We're running an e-commerce site that provides product search. We've > been able to extract colors from product images, and we think it'd be > cool and useful to search products by color. A product image can have > up to 5 colors (from a color space of about 100 colors), so we can > implement it easily with Solr's facet search (thanks all who've developed Solr). > > The problem arises when we try to sort the results by the color relevancy. > What's different from a normal facet search is that colors are > weighted. For example, a black dress can have 70% of black, 20% of > gray, 10% of brown. A search query "color:black" should return results > in which the black dress ranks higher than other products with less percentage of black. > > My question is: how to configure and index the color field so that > products with higher percentage of color X ranks higher for query "color:X"? > > Thanks for your help! > > - Guangwei
