See https://sourceforge.net/p/openil/patches/52/

--- src-IL/src/il_pcx.c	(revision 1678)
+++ src-IL/src/il_pcx.c	(working copy)
@@ -375,20 +375,26 @@
 	if (Header->NumPlanes == 1 && Header->Bpp == 1) {
 		for (j = 0; j < iCurImage->Height; j++) {
 			i = 0; //number of written pixels
-			while (i < iCurImage->Width) {
+			Bps = 0;
+			while (Bps<Header->Bps) {
 				if (iread(&HeadByte, 1, 1) != 1)
 					return IL_FALSE;
+				++Bps;
+				// Check if we got duplicates with RLE compression
 				if (HeadByte >= 192) {
 					HeadByte -= 192;
 					if (iread(&Data, 1, 1) != 1)
 						return IL_FALSE;
 
+					--Bps;
+					// duplicate next byte
 					for (c = 0; c < HeadByte; c++) {
 						k = 128;
 						for (d = 0; d < 8 && i < iCurImage->Width; d++) {
 							iCurImage->Data[j * iCurImage->Width + i++] = ((Data & k) != 0 ? 255 : 0);
 							k >>= 1;
 						}
+						++Bps;
 					}
 				}
 				else {
@@ -408,8 +414,12 @@
 			//If Width/8 is even no padding is needed,
 			//one pad byte has to be read otherwise.
 			//(let's hope the above is true ;-))
-			if(!((iCurImage->Width >> 3) & 0x1))
-				igetc();	// Skip pad byte
+
+			// changed 2012-05-06
+			// Not the good size - don't need it, padding inside data already !
+
+		//	if(!((iCurImage->Width >> 3) & 0x1))
+		//		igetc();	// Skip pad byte
 		}
 	}
 	else if (Header->NumPlanes == 4 && Header->Bpp == 1){   // 4-bit images