The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Claybrook Software:
Touch Colors is the incredible new color utility available for the iPhone, iPod Touch, and iPad, and anyone can use it!Touch Colors makes it easy for you to find the perfect color for any project, professional or personal. Whether you are a graphics designer, print shop operator, teacher, student, imaging software hobbyist, or just someone interested in the digital science of color, Touch Colors has something that you'll love.With Touch Colors, you can create colors using the RGB, HSB, and CMYK color models, and convert between all three. If you still can't isolate the perfect color you're searching for, you can grab colors from photos taken using your iPhone or iPod Touch's camera or photo library. For example:You drive past a beautiful barn, painted with a rich red color that you know you have to use in your upcoming project. You pull out your iPhone, snap a quick photo of the barn, and continue on your way. You can now load that image into Touch Colors and drag your finger across the surface of the barn to isolate the color that you've discovered. From here, you can either view a chart describing the digital values of that color in all three color models, or save the color, and look at these values later.View colors, create colors, capture colors, and save colors, all from your iOS device, using Touch Colors.