Fashion marketers are getting more diverse when it comes to who appears in the ads they run in glossy magazines — with a 6.5 percent increase in nonwhite models in the recent March issues.

But the needle is not moving very rapidly.

Advertising featuring white models or celebrities still made up 78.2 percent of the ads in the important March books.

That is down from 84.7 percent six months earlier, according to a survey by thefashionspot.com, slated to be released Friday.

“The good news is that it is more racially diverse,” said Jennifer Davidson, managing editor of thefashionspot.com, which examined 236 ad campaigns. “The downside is that there is a long way to go.”

Five fashion marketers — Versace, Saint Laurent, Forever 21, Miu Miu and BCBG Max Azria — ended up in the “Hall of Shame” for using no nonwhite models in their March campaigns.

“We included them because they had campaigns with three or more models and all of them were white,” said Davidson.

Calvin Klein, Alexander Wang and Marc Jacobs were singled out for praise for their ad diversity.

Overall, the number of black models featured rose to 8.3 percent, from 4.4 percent in the fall.

Latino models showed up in 3.8 percent of the campaigns, up from only 1.7 percent in the fall.

Asian models fell to 4 percent, a drop of 2.2 percentage points from the fall.