From 6b11a5e445db1d50e931e3ed328b5b8d4d1c2efb Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Fri, 11 Jan 2019 23:57:05 +0800
Subject: astro/ds9saveimg.sh: save an image of a FITS file with regions

This script helps to save an image of a FITS file with regions loaded.
It is intended to batch save lots of pair of FITS images and region
files.
---
 astro/ds9saveimg.sh | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100755 astro/ds9saveimg.sh

diff --git a/astro/ds9saveimg.sh b/astro/ds9saveimg.sh
new file mode 100755
index 0000000..13cbac1
--- /dev/null
+++ b/astro/ds9saveimg.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+#
+# Copyright (c) 2019 Aaron LI <aly@aaronly.me>
+# MIT License
+#
+# Use SAOImage ds9 to open a FITS image, load the regions from a region
+# file, and then snapshot the window content to an image file via XPA.
+#
+# References:
+# - http://ds9.si.edu/doc/ref/xpa.html#saveimage
+#
+
+NAME="${0##*/}"
+
+if [ $# -ne 2 ]; then
+    echo "usage: ${NAME} <file.fits> <ds9.reg>"
+    exit 1
+fi
+
+FITS="$1"
+REG="$2"
+IMG="${FITS%.fits}.png"
+TITLE="${NAME%.sh}$$"
+
+ds9 ${FITS} \
+    -width 768 -height 768 \
+    -zoom to fit \
+    -scale linear -scale mode 99.9 \
+    -cmap sls \
+    -regions format ds9 -regions ${REG} \
+    -title ${TITLE} &
+PID=$!
+echo "Launched ds9 as PID=${PID}"
+
+retry=1
+while [ ${retry} -ne 0 ]; do
+    sleep 1
+    # Bring the window to the front and snapshot to an image file
+    wmctrl -a ${TITLE}
+    xpaset -p ${TITLE} saveimage png ${IMG}
+    retry=$?
+done
+echo "${TITLE}: ${FITS} + ${REG} => ${IMG}"
+
+#echo 'paused ...' && read _
+kill ${PID}
-- 
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