Thermodevelopable silver halide photographic material and process for producing images therewith

#This invention relates to a thermodevelopable photographic material adapted for use in a process which comprises forming a dye image by heating the material in a substantially water-free condition and transferring it to a dye fixing layer to form an image which is substantially black at high density, gray at low density, and can replace silver images.

#Photographic processes involving the use of silver halides have been widely used heretofore because of their superior photographic properties, such as sensitivity, tone adjustment etc., in contrast to other photographic processes such as electrophotography or diazo photography.

#In recent years, techniques have been developed for obtaining images easily and rapidly using silver halide photographic materials by processing them in the dry state, such as by heating, instead of conventional wet treatments such as using developer solutions.

#The L*a*b* color indicating system is described in Commission International de I'Eclarrage Colorimetry, 2nd Ed. Official Recommendations of the International Commission on Illumination, CIE Publication No. 15.2 (TC-1.3) 1982.

#The above values a* and b* can be measured by using a color analyzer, for example, Color Analyzer Type 670, made by Hitachi Limited.

#The invention does not depend on L* (light level). In other words, the effect of this invention does not depend on L*.