diff --git a/imgcat/imgcat.py b/imgcat/imgcat.py
index e192667..9fb63fb 100644
--- a/imgcat/imgcat.py
+++ b/imgcat/imgcat.py
@@ -98,14 +98,14 @@ def to_content_buf(data: Any) -> bytes:
         # numpy ndarray: convert to png
         import numpy
         im: 'numpy.ndarray' = data
+        if im.dtype.kind == 'f':
+            # https://stackoverflow.com/a/66862750
+            im = (im * 256).clip(0, 255).astype('uint8')
         if len(im.shape) == 2:
             mode = 'L'     # 8-bit pixels, grayscale
-            im = im.astype(sys.modules['numpy'].uint8)
         elif len(im.shape) == 3 and im.shape[2] in (1, 3, 4):
             # (H, W, C) format
             mode = None    # RGB/RGBA
-            if im.dtype.kind == 'f':
-                im = (im * 255).astype('uint8')
             if im.shape[2] == 1:
                 mode = 'L'  # 8-bit grayscale
                 im = numpy.squeeze(im, axis=2)
@@ -113,8 +113,6 @@ def to_content_buf(data: Any) -> bytes:
             # (C, H, W) format
             mode = None    # RGB/RGBA
             im = numpy.rollaxis(im, 0, 3)  # CHW -> HWC
-            if im.dtype.kind == 'f':
-                im = (im * 255).astype('uint8')
             if im.shape[2] == 1:
                 mode = 'L'  # 8-bit grayscale
                 im = numpy.squeeze(im, axis=2)