You might think that with today’s grading and authenticating technology, counterfeits would be on the decline.

Screen tones and halftones, which are essentially the same, are used to simulate shades of gray in bitmap, or black and white, images. You can also use them to create special effects, such as the ...

THE DAILY PIC (#1753): This pair of canvases by Andy Warhol has come to be known as Most Wanted Men No. 6, Thomas Francis C., and it’s on view in the current hang of the Broad Museum in Los Angeles.