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npage: run gs with -dDOINTERPOLATE option

--- a/sys/src/cmd/npage.c

+++ b/sys/src/cmd/npage.c

@@ -308,7 +308,7 @@

 popengs(Page *p)

 {

 	int n, i, pdf, ifd, ofd, pin[2], pout[2], pdat[2];

-	char buf[NBUF], nam[32], *argv[12];

+	char buf[NBUF], nam[32], *argv[16];

 	pdf = 0;

 	ifd = p->fd;

@@ -382,8 +382,9 @@

 		argv[8] = "-dGraphicsAlphaBits=4";

 		snprint(buf, sizeof buf, "-r%d", ppi);

 		argv[9] = buf;

-		argv[10] = pdf ? "-" : "/fd/4";

-		argv[11] = nil;

+		argv[10] = "-dDOINTERPOLATE";

+		argv[11] = pdf ? "-" : "/fd/4";

+		argv[12] = nil;

 		exec("/bin/gs", argv);

 		sysfatal("exec: %r");

 	}

-- 

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