Tip: When you make your own mosaic designs, don’t use one blue color for an area such as this. Photoshop Elements Exampleįor this example, we will use a jpeg of Henri Matisse’s painting “The Dance” and find the percent of the total area that is covered by blue. If we take an average of the value of all pixels, this weighted average divided by 255 will represent the percent of the image area that is NOT the particular color. In the RBG color mode used by JPEGs, white has a value of 255 and black has a value of 0. This method uses Photoshop’s Magic Extractor to cut out the color field, then turning that color field black and putting it on a white background. I would think GIMP and other freeware imaging packages could be adapted in some way as well. I used Photoshop Elements because that was what I had installed. The trick is to find some way for the computer to tell us this information, and there are probably many image editing software packages that could be used in some way to do it. If you get the image into the computer, the computer already knows how many pixels are that color and the total number of pixels in the image. The following is a method using Photoshop Elements. How do you estimate the area covered by an individual color when it is arranged in irregular shapes throughout a mosaic design? In fact, most of the individual color fields in a mosaic are arranged in irregular shapes, unless you are doing an abstract geometrical pattern. It’s easy to estimate the total area of a rectangular or circular mosaic using our tile estimator, but it can be much more difficult if the shape of the mosaic is irregular.
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