ThumbsPlus includes an extensive raster and vector viewer with many features, including zoom, synchronization, scale to gray, gamma correction, full screen, window position and size control, and multiple monitor support. You can also move, copy and save images to a different format from a view window.
While ThumbsPlus is not an illustration or painting program, it does include quite a few image editing functions that operate on the entire image or a selected area. These include cropping, color adjustments, color depth, rotation, resize, image and text stamping (overlay), copy and paste, image filtering (sharpen, blur, edge detect, special effects), histogram stretching and equalization, and several specialized image processes. For vector files (metafiles), you can remove the background and convert to raster format.