WCAG 2.0 1.4.3 Contrast (Minimum) requires the visual presentation of text and images to have a contrast ratio of at least 4:5:1, with the exception of large text, incidental text, and logotype.
The benefit cited for this success criteria is that people with low vision and color vision deficiencies often have difficulty reading text that does not contrast with its background. Providing contrast between the text on your page and the background images and colors used in your Lectora title will make the text more readable.
You can use the links below to find tools for measuring color contrast. These tools are recommended by the W3C, and can be referenced here: http://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html.
List of color contrast tools (http://www.456bereastreet.com/archive/200709/10_colour_contrast_checking_tools_to_improve_the_accessibility_of_your_design/)
Colour Contrast Analyser - Firefox Extension (http://juicystudio.com/article/colour-contrast-analyser-firefox-extension.php)
Contrast Analyser – Application (http://www.paciellogroup.com/resources/contrastAnalyser)
Contrast Ratio Analyser - online service (http://juicystudio.com/services/luminositycontrastratio.php)
Contrast Ratio Calculator (http://www.msfw.com/accessibility/tools/contrastratiocalculator.aspx)
Colour Contrast Check (http://snook.ca/technical/colour_contrast/colour.html)
Colors On the Web Color Contrast Analyzer (http://www.colorsontheweb.com/colorcontrast.asp)
American Printing House for the Blind Guidelines Print Document Design (http://www.aph.org/edresearch/lpguide.htm)
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