Extract colors from an image
One of the coolest ways to assemble a unique color theme for a presentation is to create a simple palette by extracting colors from a key image that you think represents the appropriate colors for your talk. You can do something similar to this within your slideware application, of course, but Kuler can do it automatically and give you some additional options for tweaking the colors. After you upload an image, Kuler automatically uses its color extraction tool to generate a theme of five colors from the image. You can then adjust the entire theme by changing what Kuler calls the "mood" of the theme. You can select from Colorful, Bright, Muted, Deep, and Dark moods which are based on the colors extracted from your image. After you decide which mood is the best fit, you can then save it to your account, share it with the community if you like, and even download it as an Adobe Swatch Exchange file. To get the theme into your slideware, you may have to take a screen shot of the theme and then use your slideware's color picker to save the colors into a new theme for your presentation.
Sample: Image from nature
In Wabi Sabi Style, James and Sandra Crowley say "Nature is a master colorist. Anything and everything one could possibly want to learn about creating color schemes, color contrasting, and coordination can be gleaned straight from nature itself." So why not try making a unique color theme from a photo of a nature scene.
Above: I used an image not from a photo but from a video clip taken during a trip to the beach last summer in the USA. The sandy, brownish-grays and blues of a (sunny) summer day in Cannon Beach, Oregon create a simple, refreshing palette.
Above: After I saved the original color theme, I chose the "make changes/view color values" option which presents you with many options for adjusting your theme. Here I select a new base color on the far right.
Above: Then I chose "Monochromatic" which adjusts the four other colors in terms of value and saturation — but the hue stays the same (as you can see in the color wheel). The base color of "gray" had a bit of yellow/brown from the rock.
Above: The sample slides use colors from the two themes created in Kuler shown above (plus white for the labels). More black was added to the background color in the second slide to increase contrast with the foreground.
Any introduction to color theory includes a discussion on the different rules for combining colors. For most people, however, the terms found in color theory are rather abstract; people just want a way to choose and mix colors that form a harmonious relationship. The Kuler website allows you to select a color of your choice and then apply harmony rules such as Analogous, Monochromatic, Triad, Complementary, Compound, and Shades that are based on some of the basic tried-and-true principles from color theory. All you have to do, then, is select a base color and a color rule to quickly create harmonious themes, or use the Custom rule to select colors individually. You can use one of your own themes — or one of the public themes — to create a new theme starting from the selection of a single color. After you decide on a theme, you may want to adjust the relative value of some of the colors — that is, make them lighter or darker — to make sure you have good contrast.
Above: Using three colors from a theme called "organic" plus white to create this slide. Not crazy about it, but perhaps it could be used in a presentation on organic farming, etc.
Experiment and play with the tool
You can spend hours playing around with Kuler, but this is not wasted time if it helps you see how color harmonies can be created by adjusting hue, value, and saturation. For actual presentation themes, you'll want to keep the number of different hues to a minimum. The mantra is always to use color for a reason and with restraint, but for the purposes of teaching yourself more about how colors can work together, it's OK to go a little wild sometimes. I'm certain many of you already know about Kuler, but for those of you who do not, I hope you enjoy experimenting with it. Kuler has a great community and it's a wonderful online tool.
Colors were extracted from the photo of the salmon and rice to create the color theme.
Update: Please checkout the post on my Posterous site concerning a cool plug-in for saving your themes created in Kuler so that they show up in your Mac apps. (Anyone know if there is something as simple and powerful as Mondrianum for the PC?)