--- a/tif_dirread.c
+++ b/tif_dirread.c
@@ -3750,5 +3750,4 @@
     if (!TIFFFieldSet(tif, FIELD_IMAGEDIMENSIONS))
     {
-        MissingRequired(tif, "ImageLength");
-        goto bad;
+        TIFFWarningExtR(tif, module, "TIFF directory is missing required ImageLength field");
     }
@@ -4263,4 +4263,3 @@
     if (!tif->tif_scanlinesize) {
-        TIFFErrorExtR(tif, module, "Cannot handle zero scanline size");
-        return (0);
+        TIFFWarningExtR(tif, module, "Cannot handle zero scanline size");
     }
@@ -4263,4 +4263,3 @@
         if (!tif->tif_tilesize) {
-            TIFFErrorExtR(tif, module, "Cannot handle zero tile size");
-            return (0);
+            TIFFWarningExtR(tif, module, "Cannot handle zero tile size");
         }
@@ -4263,4 +4263,3 @@
         if (!TIFFStripSize(tif)) {
-            TIFFErrorExtR(tif, module, "Cannot handle zero strip size");
-            return (0);
+            TIFFWarningExt(tif, module, "Cannot handle zero strip size");
         }
@@ -5377,6 +5377,6 @@ static void MissingRequired(TIFF *tif, const char *tagname)
 {
     static const char module[] = "MissingRequired";
 
-    TIFFErrorExtR(tif, module,
+    TIFFWarningExtR(tif, module,
                   "TIFF directory is missing required \"%s\" field", tagname);
 }
--- a/tif_strip.c
+++ b/tif_strip.c
@@ -300,5 +300,5 @@
     if (scanline_size == 0)
     {
-        TIFFErrorExtR(tif, module, "Computed scanline size is zero");
+        TIFFWarningExtR(tif, module, "Computed scanline size is zero");
         return 0;
     }