Blue–green distinction in language "azul-" means turquoise-blue. One can also make the distinction between "verde-claro" and "verde-escuro", meaning light and dark-green respectively, and more distinctions between several qualities of green: for instance, "verde-" means olive-green and "verde-" means emerald-green. Cyan is usually called "azul-celeste" (sky blue) or "azul-", meaning pool blue, but also less commonly "", and "verde-", meaning water green. Romanian clearly distinguishes between the colors green (') and blue ('). It also uses separate words for different hues of the same color, e.g. light blue ('), blue ("albastru"), dark-blue ("bleu-" or '), along with a word for turquoise (') and azure ('
Color normalization blue channel like histogram equalization. The comprehensive color normalization is shown to increase localization and object classification results in combination with color indexing. It is an iterative algorithm which works in two stages. The first stage is to use the red, green and blue color space with the intensity normalized, to normalize each pixel. The second stage is to normalize each color channel separately, so that the sum of the color components is equal to one third of the number of pixels. The iterations continue until convergence, meaning no additional changes. Formally: Normalize the color image formula_7 which consists of