From 18e26902255a71e85d5ff990f20268fc33c953cd Mon Sep 17 00:00:00 2001
From: Garrett Smith <g@rre.tt>
Date: Sat, 17 Aug 2019 10:08:10 -0500
Subject: [PATCH] Example adding various images

---
 examples/demo_image.py | 57 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 examples/demo_image.py

diff --git a/examples/demo_image.py b/examples/demo_image.py
new file mode 100644
index 00000000..b3a7ede6
--- /dev/null
+++ b/examples/demo_image.py
@@ -0,0 +1,57 @@
+import io
+import urllib
+
+import numpy as np
+from PIL import Image, ImageDraw
+
+from tensorboardX import SummaryWriter
+from tensorboardX.proto.summary_pb2 import Summary
+
+writer = SummaryWriter()
+
+# Generated image - 'HWD' format
+
+blue = Image.new('RGB', (240, 240), color='blue')
+writer.add_image('blue', np.asarray(blue), dataformats='HWD')
+
+# PNG file - 'HWC' format
+
+screenshot = Image.open('../screenshots/scalar.png')
+writer.add_image('screenshot', np.asarray(screenshot), dataformats='HWC')
+
+# JPG format - 'HWD' format
+
+url = ('https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/'
+       'Cyanocitta_cristata_blue_jay.jpg/792px-Cyanocitta_cristata_blue_jay.jpg')
+jay = Image.open(urllib.urlopen(url))
+writer.add_image('jay', np.asarray(jay), dataformats='HWD')
+
+# Avoid round-trip (image -> array -> image) by adding summary directly
+
+def summary_image(img):
+    output = io.BytesIO()
+    img.save(output, format='PNG')
+    encoded = output.getvalue()
+    output.close()
+    return Summary.Image(
+        height=img.height,
+        width=img.width,
+        colorspace=len(img.getbands()),
+        encoded_image_string=encoded)
+
+def add_image(writer, tag, img):
+    summary = Summary(value=[Summary.Value(tag=tag, image=summary_image(img))])
+    writer.file_writer.add_summary(summary)
+
+# Detection bounding box
+
+jay_detect = jay.copy()
+ImageDraw.Draw(jay_detect).rectangle(((505, 154), (550, 204)), outline="white")
+add_image(writer, "jay-detect", jay_detect)
+
+# Flip
+
+screenshot_flipped = screenshot.transpose(Image.FLIP_LEFT_RIGHT)
+add_image(writer, "screenshot-flipped", screenshot_flipped)
+
+writer.close()