https://github.com/ImageMagick/ImageMagick/issues/1753

diff --git a/coders/pdf.c b/coders/pdf.c
index 7bb168ebf9c1a176f91ace4f2d69fbd7b6cec371..3a8de0411fbda9f6a9e4d091eebb66196226ed55 100644 (file)
--- a/coders/pdf.c
+++ b/coders/pdf.c
@@ -2543,7 +2543,7 @@ RestoreMSCWarning
                 for (x=0; x < (ssize_t) tile_image->columns; x++)
                 {
                   Ascii85Encode(image,(unsigned char)
-                    GetPixelIndex(tile_image,p));
+                    ((ssize_t) GetPixelIndex(tile_image,p)));
                   p+=GetPixelChannels(image);
                 }
               }