I need to convert some academic graphics to .eps. I don’t have the option of using a different final format. In Inkscape most of the graphics files convert fine. In one the colors selectively wash out within parts of the image. Two side-by-side pairs of maps wash out in a distinct gradient that gets worse toward the upper right within each. The colors in the legend between the pairs of maps are fine. (The image is a .jpg of a screen capture of the .eps.)
If I export to .svg, the colors are bright throughout. If I bring in the .svg and export that to .eps the same color degradation happens. I have tried File, Clean up document without effect. Ideas please?