--- a/tools/lib64fmts.c	Tue Jun 26 20:20:00 2018 +0300
+++ b/tools/lib64fmts.c	Wed Jun 27 13:13:57 2018 +0300
@@ -972,6 +972,41 @@
 }
 
 
+static int fmtEncodeECIPacked(DMGrowBuf *buf, const DMC64Image *img, const DMC64ImageFormat *fmt)
+{
+    int res;
+    DMGrowBuf tmp;
+    DMCompParams cfg;
+
+    // Encode the data to temp buffer
+    if ((res = dmC64EncodeGenericBMP(TRUE, &tmp, img, fmt)) != DMERR_OK)
+        goto out;
+
+    // Analyze and setup RLE
+    cfg.func         = fmt->name;
+    cfg.type         = DM_COMP_RLE_MARKER;
+    cfg.flags        = DM_RLE_BYTE_RUNS | DM_RLE_ORDER_1;
+    cfg.rleMinCountB = 4;
+    cfg.rleMaxCountB = 255;
+
+    dmGenericRLEAnalyze(&tmp, &cfg);
+
+    // Add the header bits
+    if (!dmGrowBufPutU8(buf, cfg.rleMarkerB))
+    {
+        res = DMERR_MALLOC;
+        goto out;
+    }
+
+    // And now RLE compress the data to the existing buffer
+    res = dmEncodeGenericRLE(buf, &tmp, &cfg);
+
+out:
+    dmGrowBufFree(&tmp);
+    return res;
+}
+
+
 //
 // Helper macros for defining screen memory layouts
 // common for several FLI type image formats
@@ -1620,9 +1655,9 @@
     },
 
     {
-        "ecp", "ECI Graphic Editor 1.0 (packed)", 0x4000, 0, DM_FMT_RD,
+        "ecp", "ECI Graphic Editor 1.0 (packed)", 0x4000, 0, DM_FMT_RDWR,
         fmtProbeECIPacked,
-        fmtDecodeECIPacked, NULL,
+        fmtDecodeECIPacked, fmtEncodeECIPacked,
         { }, &dmC64CommonFormats[7]
     },