diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index eb561611718..6d786fba2b3 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -784,7 +784,7 @@ def tobytes(self, encoder_name: str = "raw", *args: Any) -> bytes:
 
         # unpack data
         e = _getencoder(self.mode, encoder_name, encoder_args)
-        e.setimage(self.im)
+        e.setimage(self.im, (0, 0) + self.size)
 
         from . import ImageFile
 
diff --git a/src/encode.c b/src/encode.c
index 513309c8d7d..f0f17063794 100644
--- a/src/encode.c
+++ b/src/encode.c
@@ -232,7 +232,7 @@ _setimage(ImagingEncoderObject *encoder, PyObject *args) {
     x0 = y0 = x1 = y1 = 0;
 
     /* FIXME: should publish the ImagingType descriptor */
-    if (!PyArg_ParseTuple(args, "O|(nnnn)", &op, &x0, &y0, &x1, &y1)) {
+    if (!PyArg_ParseTuple(args, "O(nnnn)", &op, &x0, &y0, &x1, &y1)) {
         return NULL;
     }
     im = PyImaging_AsImaging(op);
@@ -244,15 +244,10 @@ _setimage(ImagingEncoderObject *encoder, PyObject *args) {
 
     state = &encoder->state;
 
-    if (x0 == 0 && x1 == 0) {
-        state->xsize = im->xsize;
-        state->ysize = im->ysize;
-    } else {
-        state->xoff = x0;
-        state->yoff = y0;
-        state->xsize = x1 - x0;
-        state->ysize = y1 - y0;
-    }
+    state->xoff = x0;
+    state->yoff = y0;
+    state->xsize = x1 - x0;
+    state->ysize = y1 - y0;
 
     if (state->xsize <= 0 || state->xsize + state->xoff > im->xsize ||
         state->ysize <= 0 || state->ysize + state->yoff > im->ysize) {