Great tool for checking color contrast for both text and images of text.See the website
DescriptionAnalyze a web page or portion of a web page for conformance with WCAG 2.0 Color Contrast requirements. The Color Contrast Analyzer chrome extension is great for checking color contrast for both text and images of text. It offers the possibility to scan for two levels (AA and AAA) of ARIA requirements. The extension applies a mask and highlights only the parts of the UI which fulfill the color contrast.