This patch is for zimg-4.19.1, fixes:
  1) dump-colormap with default map yield inverted order map. (color.c)
  2) crash with muilti-column option when numbers of data columns exceed
     specified size (x*y). (read.c)

--- zimg-4.19.1.orig/color.c	Sat Sep 28 01:00:22 2002
+++ zimg-4.19.1/color.c	Wed May  7 16:29:46 2003
@@ -213,39 +213,40 @@
 	fprintf(stderr, "(getGdColorMap) len3 = %d\n", len3);
 	fprintf(stderr, "(getGdColorMap) len4 = %d\n", len4);
 #endif
-        for (j = ZIMG_MAP_COLORS - 1, i = 0; i < len1; i++, j--) {
+
+        for (j = 0, i = len - 1; i >= len4; i--, j++) {
             gdcolor[j] = allocColor(im,
-		    ((int)((double)0xff))^R,
-		    ((int)((double)0xff * (double)i / (double)len1))^G,
-		    ((int)((double)0x00))^B);
+		    ((int)((double)0xff * (double)(i - len4) / (double)len1))^R,
+		    ((int)((double)0x00))^G,
+		    ((int)((double)0xff))^B);
 
         }
-        for (; i < len2; i++, j--) {
+        for (; i >= len3; i--, j++) {
             gdcolor[j] = allocColor(im,
-		    ((int)((double)0xff * (double)(len2 - i) / (double)len1))^R,
-		    ((int)((double)0xff))^G,
-		    ((int)((double)0x00))^B);
+		    ((int)((double)0x00))^R,
+		    ((int)((double)0xff * (double)(len4 - i) / (double)len1))^G,
+		    ((int)((double)0xff))^B);
 
         }
-        for (; i < len3; i++, j--) {
+        for (; i >= len2; i--, j++) {
             gdcolor[j] = allocColor(im,
 		    ((int)((double)0x00))^R,
 		    ((int)((double)0xff))^G,
 		    ((int)((double)0xff * (double)(i - len2) / (double)len1))^B);
 
         }
-        for (; i < len4; i++, j--) {
+        for (; i >= len1; i--, j++) {
             gdcolor[j] = allocColor(im,
-		    ((int)((double)0x00))^R,
-		    ((int)((double)0xff * (double)(len4 - i) / (double)len1))^G,
-		    ((int)((double)0xff))^B);
+		    ((int)((double)0xff * (double)(len2 - i) / (double)len1))^R,
+		    ((int)((double)0xff))^G,
+		    ((int)((double)0x00))^B);
 
         }
-        for (; i < len; i++, j--) {
+        for (; i >= 0; i--, j++) {
             gdcolor[j] = allocColor(im,
-		    ((int)((double)0xff * (double)(i - len4) / (double)len1))^R,
-		    ((int)((double)0x00))^G,
-		    ((int)((double)0xff))^B);
+		    ((int)((double)0xff))^R,
+		    ((int)((double)0xff * (double)i / (double)len1))^G,
+		    ((int)((double)0x00))^B);
 
         }
     }
diff -ru zimg-4.19.1.orig/read.c zimg-4.19.1/read.c
--- zimg-4.19.1.orig/read.c	Wed Jul  3 04:02:11 2002
+++ zimg-4.19.1/read.c	Wed May  7 10:46:03 2003
@@ -115,7 +115,7 @@
 	    }
             
             if (z->column == ALL_COLUMNS) { /* read **all** available columns */
-                for (i = 0; i < nargs; i++) {
+                for (i = 0; i < nargs && no < z->data.len; i++) {
                     if (sscanf (args[i], "%f", data + no) == 1)
                         no ++;
 
@@ -123,7 +123,7 @@
 
             } else if (z->column != 1) {
 
-		for (col = column; -1 != *col; col++) {
+		for (col = column; -1 != *col && no < z->data.len; col++) {
 		    if (*col < nargs && (sscanf (args[*col], "%f", data + no) == 1)) {
 			no++;
 		    } else {