diff -r -c jpegdir/huffman.c jpegdir.ge/huffman.c
*** jpegdir/huffman.c	Wed Mar  1 20:57:22 1995
--- jpegdir.ge/huffman.c	Mon Jan  4 14:10:44 1999
***************
*** 57,62 ****
--- 57,63 ----
  extern void MakeDhuff();
  extern void UseACHuffman();
  extern void UseDCHuffman();
+ extern void UseDCHuffmanCheckingGEMSBug();
  extern void SetACHuffman();
  extern void SetDCHuffman();
  extern void PrintHuffman();
***************
*** 678,684 ****
--- 679,721 ----
       int index;
  {
    BEGIN("UseDCHuffman");
+ index = 0;
+   Xhuff = CImage->DCXhuff[index];
+   Dhuff = CImage->DCDhuff[index];
+   Ehuff = CImage->DCEhuff[index];
+   if (!Dhuff && !Ehuff)
+     {
+       WHEREAMI();
+       printf("Reference to nonexistent table %d.\n",index);
+     }
+ }
  
+ /*BFUNC
+ 
+ UseDCHuffmanCheckingGEMSBug() installs the DC Huffman structure from the CImage
+ structure.
+ 
+ EFUNC*/
+ 
+ void UseDCHuffmanCheckingGEMSBug(index,detected_gems_predictor_bug)
+      int index;
+      int *detected_gems_predictor_bug;
+ {
+   BEGIN("UseDCHuffmanCheckingGEMSBug");
+ 
+   if (index == 1
+    && !CImage->DCDhuff[index] && !CImage->DCEhuff[index]
+    && CImage->DCDhuff[0] && !CImage->DCEhuff[0])
+     {
+       index = 0;
+       *detected_gems_predictor_bug = 1;
+       printf("GE table selection bug detected - assuming predictor bug also\n",index);
+     }
+   else
+     {
+       *detected_gems_predictor_bug = 0;
+     }
+ 
    Xhuff = CImage->DCXhuff[index];
    Dhuff = CImage->DCDhuff[index];
    Ehuff = CImage->DCEhuff[index];
diff -r -c jpegdir/jpeg.c jpegdir.ge/jpeg.c
*** jpegdir/jpeg.c	Wed Mar  1 20:57:21 1995
--- jpegdir.ge/jpeg.c	Mon Jan  4 16:59:32 1999
***************
*** 1358,1363 ****
--- 1358,1365 ----
    int MaxElem,CurrentElem,NumberElem;
    int StartofLine=1,UseType=1;              /* Start with type 1 coding */
    int *input;
+   int last_pixel;				/* should initialize this sometime */
+   int detected_gems_predictor_bug;
  
    PointTransform=CScan->SAL;
    for(j=0;j<CScan->NumberComponents;j++)    /* Important to rewind to start */
***************
*** 1379,1385 ****
  	}
      }
    InstallIob(0);
!   UseDCHuffman(CScan->td[0]);          /* Install DC table */
    if (CScan->NumberComponents==1)
      height=horfreq=1;
    else
--- 1381,1387 ----
  	}
      }
    InstallIob(0);
!   UseDCHuffmanCheckingGEMSBug(CScan->td[0],&detected_gems_predictor_bug);          /* Install DC table */
    if (CScan->NumberComponents==1)
      height=horfreq=1;
    else
***************
*** 1466,1472 ****
  	      px = input[width];
  	      break;
  	    case 2:
! 	      px = input[1];
  	      break;
  	    case 3:
  	      px = input[0];
--- 1468,1475 ----
  	      px = input[width];
  	      break;
  	    case 2:
! 	    /*px = input[1];*/
! 	      px = detected_gems_predictor_bug ? last_pixel : input[1];
  	      break;
  	    case 3:
  	      px = input[0];
***************
*** 1493,1499 ****
  	  else
  	    {
  	      value = LosslessDecodeDC();
! 	      input[width+1] = (value+px)&0xffff;
  	      if (Loud > MUTE)
  		{
  		  printf("OUT=%d  PX=%d  VAL: %d\n",
--- 1496,1508 ----
  	  else
  	    {
  	      value = LosslessDecodeDC();
! 	      if (detected_gems_predictor_bug) {
! 	        input[width+1] = (px-value)&0xffff;
! 	        last_pixel = (px-value)&0xffff;
! 	      }
! 	      else {
! 	        input[width+1] = (value+px)&0xffff;
! 	      }
  	      if (Loud > MUTE)
  		{
  		  printf("OUT=%d  PX=%d  VAL: %d\n",
diff -r -c jpegdir/prototypes.h jpegdir.ge/prototypes.h
*** jpegdir/prototypes.h	Wed Mar  1 20:57:18 1995
--- jpegdir.ge/prototypes.h	Mon Jan  4 14:09:13 1999
***************
*** 85,90 ****
--- 85,91 ----
  extern void MakeDhuff();
  extern void UseACHuffman();
  extern void UseDCHuffman();
+ extern void UseDCHuffmanCheckingGEMSBug();
  extern void SetACHuffman();
  extern void SetDCHuffman();
  extern void PrintHuffman();