diff --git a/cellpose/io.py b/cellpose/io.py
index 5d081bb2..18833827 100644
--- a/cellpose/io.py
+++ b/cellpose/io.py
@@ -47,6 +47,33 @@
 io_logger = logging.getLogger(__name__)
 
 def logger_setup(cp_path=".cellpose", logfile_name="run.log", stdout_file_replacement=None):
+    """Set up logging to a file and stdout (or a file replacement).
+
+    Creates the log directory if it doesn't exist, removes any existing log
+    file, and configures the root logger to write INFO-level and above messages
+    to both a log file and stdout (or a replacement file).
+
+    Parameters
+    ----------
+    cp_path : str, optional
+        Directory name under the user's home directory for log output.
+        Default is ".cellpose".
+    logfile_name : str, optional
+        Name of the log file created inside cp_path. Default is "run.log".
+    stdout_file_replacement : str or None, optional
+        If provided, log output is written to this file path instead of stdout.
+
+    Returns
+    -------
+    logger : logging.Logger
+        Configured logger for this module. Only INFO and above messages are
+        emitted by default. To enable debug output, call
+        ``logger.setLevel(logging.DEBUG)`` on the returned logger.
+
+    Notes
+    -----
+    The log file is deleted and recreated on each call.
+    """
     cp_dir = pathlib.Path.home().joinpath(cp_path)
     cp_dir.mkdir(exist_ok=True)
     log_file = cp_dir.joinpath(logfile_name)
diff --git a/cellpose/transforms.py b/cellpose/transforms.py
index 0de7bcb5..cc957b0e 100644
--- a/cellpose/transforms.py
+++ b/cellpose/transforms.py
@@ -612,7 +612,7 @@ def convert_image(x, channel_axis=None, z_axis=None, do_3D=False):
         x_out[..., 0] = x
         x = x_out
         del x_out
-        transforms_logger.info(f'processing grayscale image with {x.shape[0], x.shape[1]} HW')
+        transforms_logger.debug(f'processing grayscale image with {x.shape[0], x.shape[1]} HW')
     elif ndim == 3:
         # assume 2d with channels
         # find dim with smaller size between first and last dims
@@ -629,7 +629,7 @@ def convert_image(x, channel_axis=None, z_axis=None, do_3D=False):
         x_out[..., :num_channels] = x[..., :num_channels]
         x = x_out
         del x_out
-        transforms_logger.info(f'processing image with {x.shape[0], x.shape[1]} HW, and {x.shape[2]} channels')
+        transforms_logger.debug(f'processing image with {x.shape[0], x.shape[1]} HW, and {x.shape[2]} channels')
     elif ndim == 4:
         # assume batch of 2d with channels
 
@@ -642,7 +642,7 @@ def convert_image(x, channel_axis=None, z_axis=None, do_3D=False):
         x_out[..., :num_channels] = x[..., :num_channels]
         x = x_out
         del x_out
-        transforms_logger.info(f'processing image batch with {x.shape[0]} images, {x.shape[1], x.shape[2]} HW, and {x.shape[3]} channels')
+        transforms_logger.debug(f'processing image batch with {x.shape[0]} images, {x.shape[1], x.shape[2]} HW, and {x.shape[3]} channels')
     else:
         # something is wrong: yell
         expected_shapes = "2D (H, W), 3D (H, W, C), or 4D (Z, H, W, C)"