To create your own themes, you must either sign in using your preexisting Adobe account information or elect to register and create a free Adobe account. Clicking "register" in the upper righthand corner of the screen will redirect you to a page where you can set one up. Otherwise, simply click "sign in" and enter your information.
Click "Create" at the top of the column on the left side of your screen.
You can then create your theme in one of two different ways: either start with a color, or begin with an image from which you can derive your scheme.
From a Color
By default, you will find that you are set up to derive a scheme derived from color selections. Here you will find five colors that you can adjust individually or with relation to one another.
Near the color wheel displayed in the top center of your screen, you will find a list of "rules" that you can apply to your theme. In each case, particular formulas or algorithms are employed to change colors relative to the hue you select as your base color (by default, that in the center of your screen).
You can change the hue of your base color in any of several ways. First make sure you have the "custom" rule selected. To edit this color, click and drag the sliders beneath the color or drag the highlighted circle in the color wheel. If you already have an RGB code and want to generate related colors, you can also plug those values into the appropriate boxes beneath your base color.
You can change which color is your base, or remove a color entirely, by hovering over a color square and choosing the desired options from those appearing above.
Once you have chosen your base color, you can apply one of the various rules to generate your theme. Note that all of these rules will alter each color with respect to your base color. In other words, all colors except for your designated base will change. See the below video, in which a base color is selected and edited by various means, and then certain "rules" are applied to demonstrate how further changes might take place and how they will affect your entire theme.
If you manually alter color selections under any of these rules, your base color will change as well. Note that under the "custom" rule, you can individually edit each of your colors without changing the others. However, applying another rule afterwards will again alter all colors but your base.
If you arrive at a particular color(s) that you like, you may wish to jot down the associated RGB codes as you go. You cannot undo your changes as you alter your colors, and should you wish to revert to earlier selections you can simply reenter those numbers.
You will also want to make use of these codes when you have arrived at your desired theme. Plugging these numbers into Prezi's Theme Wizard as described here allows you to assign these colors to various elements of your Prezi.
From an Image
Kuler enables you to make color selections and resultant themes from a preexisting image uploaded from your computer or accessed on Flickr. It even provides several stock images from which you can derive your themes.
After clicking "Create" on the home page, locate the menu in the top left and select "From an Image."
The resultant screen looks like that shown below. Under the image, you will see an "upload" button, which permits you locate, select, and upload an image from your computer.
The "flickr" button opens a floating window displaying images deemed "Interesting." Click on the pulldown menu in the upper left to filter results by time period. You can also narrow your results with the provided search bar, or click "log in" in the upper right corner to access photos stored in your personal account.
Click on an image that appeals to you, and Kuler will load it into your workspace and automatically generate a theme based on the colors it contains.
On the lefthand side of the screen you will find a list of "moods" you can select and apply to your scheme (by default Kuler applies the "colorful" setting), which change the generated theme as exemplified below.
You can also click and drag the sample circles to create a custom theme as shown below. It is sometimes difficult to tell which circle is associated with which color. It may be useful to click on the color box displaying the hue you wish to change, which will highlight the associated sample circle that you can then move.
Once you have edited the theme to your satisfaction, click in the title box, name your theme, and click the save button. Note that you also have the option to make your theme visible to the public.
Kuler then reverts to your home page, where your most recently created them is displayed at the top. Click the slider bar button in the information panel to access the editing screen, where you can make further alterations as desired and access the RGB codes you will then input to your Prezi.
See above for information about further editing your color selections. Note the RGB codes, indicated in the screenshot below, and enter them into the Prezi Theme Wizard as described on this page to assign them to the various elements of your presentation.
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