The World Association of Newspapers (WAN), which represents 18,000 newspapers and 11 news agencies, had earlier expressed "dismay" about a breakdown in talks with FIFA over the issue.
But Blatter, in an open letter to WAN chief executive, Timothy Balding, insisted "...the regulations concerning the use of photographs on the Internet are not open to further negotiation because FIFA and Infront have already gone as far as they can in view of current contracts."
FIFA says it needs the delay and the limit on photos to protect its commercial contracts for coverage via mobile and broadband which can include still as well as moving images.
But WAN plans to inform World Cup sponsors of what it says is "the very clear loss of exposure from which they will suffer owing to FIFA's publishing restrictions".
The restrictions "constitute both an interference in editorial freedom and independence and a clear breach of the right to freedom of information," according to WAN CEO Timothy Balding and AFP president and CEO Pierre Louette in a letter to Blatter.
FIFA has banned publication of World Cup photos via the internet, including on thousands of newspaper web sites, during matches and has limited the number that can be published, regardless of time limits. At present only five photos per match half and two per extra time, including penalty 'shoot-outs', can be published on web sites, regardless of time limits.
Soccer's world governing body had originally decreed that web publication of photos was banned for two hours after a match ended. Since the talks began, it has reduced this first to one hour, then to permission that first-half photos can be published as soon as a match ends, with second-half photos allowed 45 minutes later, and finally to publication at the final whistle – but never during matches.
Blatter insisted "FIFA and Infront have been extremely accommodating in reducing the original two-hour embargo to this solution".
He added that FIFA "strongly reject" claims they are seeking to maximise commercial income from the event, adding that news and photo journalists - unlike those in TV or radio - are not charged to cover an event. He said providing the necessary infrastructure and services "costs FIFA and the local organisers millions of dollars".
