Adobe released a new public beta of Lightroom, the companyis professional photo manager and editor, on Tuesday. The updated version includes Before and After preview tools, improved history features, better control over the size and resolution of exported images, improved Web output, keyword import and export, and more. Lightroom beta 3 for the Mac requires Mac OS X 10.4.3 or higher, and is available for download at the Adobe Web site. Final pricing has not been set yet.