icat kitten: Fix display of 16-bit depth images

Fixes #2542

docs/changelog.rst

@@ -39,6 +39,8 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 
 - Allow sending mouse events in kittens (:pull:`2538`)
 
+- icat kitten: Fix display of 16-bit depth images (:iss:`2542`)
+
 
 0.17.2 [2020-03-29]
 --------------------

kittens/tui/images.py

@@ -94,6 +94,7 @@ def convert(
     if scaled or width > available_width or height > available_height:
         width, height = fit_image(width, height, available_width, available_height)
         cmd += ['-resize', '{}x{}!'.format(width, height)]
+    cmd += ['-depth', '8']
     with NamedTemporaryFile(prefix='icat-', suffix='.' + m.mode, delete=False, dir=tdir) as outfile:
         run_imagemagick(path, cmd + [outfile.name])
     # ImageMagick sometimes generated rgba images smaller than the specified