Quark Inc. said it dropped its bid to acquire rival Adobe Systems Inc., the top maker of desktop graphics software, after Adobe declined to discuss a friendly transaction. Closely held Quark, which makes publishing and desktop design software, made public on Aug. 25 an unsolicited offer to acquire San Jose-based Adobe. Adobe quickly rejected the offer, saying it preferred to remain independent and didn't see any advantages in joining with Quark. Denver-based Quark said that pursuing a hostile takeover wouldn't benefit customers or shareholders of either company. It also didn't want to incur the expense of a protracted legal battle. Quark did not disclose the price it was willing to pay for Adobe, which has a $1.9-billion market value. Adobe shares rose 50 cents to close at $28.50 on Nasdaq. Quark announced its bid withdrawal after U.S. stock markets closed.