diff --git a/negpy/services/rendering/image_processor.py b/negpy/services/rendering/image_processor.py
index a6171200..e9969223 100644
--- a/negpy/services/rendering/image_processor.py
+++ b/negpy/services/rendering/image_processor.py
@@ -361,7 +361,8 @@ def _encode_export(
                 img_out,
                 photometric="rgb" if img_out.ndim == 3 else "minisblack",
                 iccprofile=icc_bytes,
-                compression="lzw",
+                compression="zlib",
+                predictor=True,
             )
             return output_buf.getvalue(), "tiff"
         elif fmt == ExportFormat.DNG:
diff --git a/negpy/services/scanning/writer.py b/negpy/services/scanning/writer.py
index 20830613..ba2c0d02 100644
--- a/negpy/services/scanning/writer.py
+++ b/negpy/services/scanning/writer.py
@@ -37,7 +37,7 @@ def write_tiff_16bit(result: ScanResult, path: str) -> str:
     fd, tmp_path = tempfile.mkstemp(suffix=".tif", dir=os.path.dirname(path) or ".")
     os.close(fd)
     try:
-        tifffile.imwrite(tmp_path, rgb, photometric="rgb", compression="lzw")
+        tifffile.imwrite(tmp_path, rgb, photometric="rgb", compression="zlib", predictor=True)
         os.replace(tmp_path, path)
     except Exception:
         if os.path.exists(tmp_path):
@@ -51,7 +51,7 @@ def write_tiff_16bit(result: ScanResult, path: str) -> str:
         fd_ir, tmp_ir = tempfile.mkstemp(suffix=".tif", dir=os.path.dirname(ir_path) or ".")
         os.close(fd_ir)
         try:
-            tifffile.imwrite(tmp_ir, ir_data, photometric="minisblack", compression="lzw")
+            tifffile.imwrite(tmp_ir, ir_data, photometric="minisblack", compression="zlib", predictor=True)
             os.replace(tmp_ir, ir_path)
         except Exception:
             if os.path.exists(tmp_ir):
diff --git a/tests/metadata/test_writer.py b/tests/metadata/test_writer.py
index 13cf2691..aae056ea 100644
--- a/tests/metadata/test_writer.py
+++ b/tests/metadata/test_writer.py
@@ -14,7 +14,7 @@ def _make_tiff_bytes() -> bytes:
     """16-bit RGB TIFF in the shape produced by the real export pipeline."""
     arr = np.random.randint(0, 65535, (16, 16, 3), dtype=np.uint16)
     buf = io.BytesIO()
-    tifffile.imwrite(buf, arr, photometric="rgb", compression="lzw")
+    tifffile.imwrite(buf, arr, photometric="rgb", compression="zlib", predictor=True)
     return buf.getvalue()
 
 
diff --git a/tests/test_export_service.py b/tests/test_export_service.py
index 8574777a..8ed37074 100644
--- a/tests/test_export_service.py
+++ b/tests/test_export_service.py
@@ -65,7 +65,8 @@ def test_image_service_tiff_export_format() -> None:
         img_16,
         photometric="rgb",
         iccprofile=b"fake_icc_bytes",
-        compression="lzw",
+        compression="zlib",
+        predictor=True,
     )
     res = out_buf.getvalue()
     assert len(res) > 0