Color palette

Olenych, S. G., Claxton, N. S., Ottenberg, G. K. and Davidson, M. W. (2007). The fluorescent protein color palette. Curr. Protoc Cell Biol. Chapter 21 Unit 21.5. 

When red cabbage is boiled in water, pigments called anthocyanins are extracted. These pigments can be used to indicate pH. In this laboratory exercise, you will observe the color of red cabbage extract as a function of pH, match each color with a color in the color palette of Microsoft PowerPoint, and, using Microsoft PowerPoint, present your findings to the class. You will work in groups of two or three for this activity. 

Amb, C. M. Dyer, A. L. Reynolds,. R., Navigating the color palette of solution-processable electrochromic polymers. Chem. Mater 2010, 23, 397-415. 

Stretch and scale individual images with brightness and contrast Select from a variety of different color palettes and display the associated color bar... 

Open the reference molecule and color the whole molecule with reference color (shift-click the square box in the Control panel to open color palette, and select the desired color). 

A color palette for various shades of browns (obviously the most useful for repair of aged papers) has sometimes been achieved through the use of different kinds of unbleached fibers such as unbleached kraft, linen, or cotton. At this point, however, it should be pointed out that pulp designed for use in book repair may differ in its requirements from that used on art objects. Pulp used on art objects must withstand continual exposure to light without significant alteration in color. Unbleached kraft, linen, or cotton fibers tend to become lighter with prolonged... 

It is well known that a robust composite color match can be buUt from a white, a black and from two colorants (A and B) which have hue angles correspondingly smaller and larger than the required colors. The closer the hues of A and B are to the required color, the better the match will be. This is why the industrial color palettes for paints and plastics applications usually consist of 12-20 colorants, more or less evenly spaced by hue angle. As there is limited number of jets available, such a large palette is not practical for most of IJ applications. 

Olenych SG, Claxton NS, Ottenberg GK, Davidson MW. The fluorescent protein color palette. In Current Protocols in Cell Biology. Bonifacino JS, Dasso M, Harford JB, Lippincott-Schwartz J, Yamada KM, eds. 2006. John Wiley Sons, Inc. New York. Giepmans BN, Adams SR, Ellisman MH, Tsien RY. The fluorescent toolbox for assessing protein location and function. Science 2006 312 217-224. 

Table 6.1 details the various video technologies, their resolutions, and the color palettes they support. 

The addition of the sodium hydroxide, which is five times as concentrated as the hydrochloric acid, causes the solution to change from being acidic to being basic the indicator mixtures are chosen so that the colors of the rainbow are formed. (The indicators methylene blue and brilliant green help to vary the color palette). 

Trex Because Trex contains natural wood fiber, slight fading will occur with exposure to sunlight and moisture. Trex decking reaches its weathered color after 10-12 weeks. The after weathering color of the boards on a Trex deck may be different from the colors shown in the Trex Color Palette guide. 

The goal is to get a reduced color palette to represent the colors in the image focused on different objectives. The next five examples show that, adequately selecting the magnitude function, it is possible to get an optimal palette according to the desired application. 

Fig. 4. Original images used in the example of MSCL avoiding dominant colors and one example of the corresponding dominant color palettes considering from 1 to 8 colors Left to right Fish, Flower, Tower, Goat.) (Color figure onlline).

Bottom of Fig. 4 shows the resulting palettes from 1 to 8 dominant colors in the four test images. The evolution of these palettes shows that, in the fish dominant-color palette, orange does not appear until using 5 dominant colors. The flower needs 4 dominant colors to show a good red color, and the tower needs 8 dominant colors to include the red in the roof. The goat dominant-color palette shows that the palette is quite monochromatic. 

MSCL Avoiding Dominant Colors. The magnitude function mf t) used in this example needs to present higher values as the pixel color is more distant from the dominant-color palette. So, for each palette of dominant colors, we define a function distcol t)) for each pixel as the distance in the color space of that pixel to the closest color in the palette palj (t) ... 

Fig. 5. Representation of a fraction of the pixels in the color distribution for the fish image. The large red circles represent the regions close to the two dominant colors of the image. The 8 blue circles represent the 8-color palette obtained for MSCL avoiding those dominant colors. MSCL uses three palette-colors for the orange colors of the fish, two colors for the white tones, and only three colors dedicated to the background colors (Color figure online).

Fig. 6. Results of color quantization for the fish example using an 8-color palette with different methods (a) MSCL avoiding two dominant colors, (b) NG, (c) FSCL, (d) FCM, (e) K-MEANS, (f) SOM. The corresponding color palettes are shown in the right of each image. As can be appreciated, MSCL gets a more vivid palette for the fish and presents a lower number of colors in the palette dedicated to the background with the anemone (Color figure onlline).

Fig. 7. Saliency example. Top row, from left to right Original image, saliency map (clearer values for high saliency), the mask binary image used for MSE measurement and (bottom row, from left to right) the reconstructed image with an 8-colors palette from SOM, FS-SOM and MSCL focused on the saliency (Color figure onlline).

Fig. 10. Results of CQ of the Fish example in a 8 color palette, avoiding different number of dominant colors (from top to bottom) with 1 to 8 dominant colors. In columns) magnitude map, pixels with magnitude value over 50% of the maximum (High Magnitude Region), and MSCL reconstruction for the corresponding number of dominant colors (Color figure onlline).

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