With the turn of the twenty-first century, painting boldly reasserted itself in German art, which for a decade had been dominated by photographers such as Andreas Gursky, Thomas Ruff, and Thomas Struth. Among those leading the country’s latest burst of painters is Daniel Richter, whose work is being showcased (through January 11) in a midcareer survey at the Denver Art Museum. Richter’s first solo museum exhibition in the United States is a modification of a show organized in 2007 at the Hamburger Kunsthalle by Christoph Heinrich, who became the Denver Art Museum’s curator of modern and contemporary