Yellow photographic color couplers containing 3-imino-1,3,4-thiadiazolyl-4 groups

A yellow coupler which corresponds to the formula

• in which E.sub.3 is chlorine or alkyl or alkoxy with 1 to 4 carbon atoms, M is alkyl with 1 to 13 carbon atoms, optionally substituted by halogen, alkoxy with 1 to 5 carbon atoms or phenoxy optionally substituted by alkyl with 1 to 5 carbon atoms;
• alkoxy with 1 to 5 carbon atoms;
• benzyl, cyclohexyl or 1-adamantyl, phenyl or phenyl substituted by alkyl or alkoxy with 1 to 5 carbon atoms, halogen, nitro or --NHCOC.sub.n H.sub.2n+1, in which n is 1 to 5;
• pyridyl, phenylamino of dialkylamino with, in each case, 1 to 5 carbon atoms in the alkyl part, R is hydrogen, alkyl with 1 to 12 carbon atoms, benzyl, phenyl, thienyl, cyclohexyl or 1-adamantyl, alkoxy with 1 to 5 carbon atoms, alkylmercapto with 1 to 4 carbon atoms, halogen, benzoyl, benzoyloxyalkyl with 1 to 5 carbon atoms in the alkyl part, benzoylamino, mono- or dialkylamino with 1 to 5 carbon atoms in the alkyl part, SO.sub.2 NH.sub.2, N,N-dialkylsulphonamide with, in each case, 1 to 5 carbon atoms in the alkyl part, or --NHCOC.sub.n H.sub.2n+1, in