diff --git a/contrib/sequoia/README.md b/contrib/sequoia/README.md
index 448e2191..90f02853 100644
--- a/contrib/sequoia/README.md
+++ b/contrib/sequoia/README.md
@@ -2,12 +2,25 @@
 
 The Sequoia captures five images per shot, an RGB JPG and four single band TIFs, but only the JPG contains GPS Exif tags. To use the single-band TIFs for multispectral mapping/analysis it’s useful (not technically required) to have them also contain GPS Exif tags.
 
-This script will copy the GPS Exif tags from the RGB JPG file to the four TIFs of the same shot.
+## prepare-tifs.sh
 
-## Requirements
+This script will copy the GPS Exif tags from the RGB JPG file to the four TIFs of the same shot. It will process all images in the working directory and use the sequence number in the filename to match JPG to TIFs. Therefore it *must* only be applied to one folder from the Sequoia per run.
+
+### Requirements
 * [exiv2](https://www.exiv2.org/)
+* bash (tested in git-bash on Windows, other shells probably work too)
 
-## Usage
+### Usage
+Run the script from a directory of images captured by Sequoia.
+```
+./prepare-tifs.sh
+```
+
+## subfolder-per-band.sh
+
+This script will move images into a subfolder per band.
+
+### Usage
 Run the script from a directory of images captured by Sequoia.
 ```
 ./prepare-tifs.sh
diff --git a/contrib/sequoia/prepare-tifs.sh b/contrib/sequoia/prepare-tifs.sh
old mode 100644
new mode 100755
index 392071e1..790974bf
--- a/contrib/sequoia/prepare-tifs.sh
+++ b/contrib/sequoia/prepare-tifs.sh
@@ -1,23 +1,15 @@
 #!/bin/sh
 
-# Rename - remove timestamp
-for img in IMG_*.*; do
-	newname=`echo $img | sed -r "s/IMG_[0-9]+_[0-9]+_//"`
-	mv $img $newname
-done
+# Copy GPS Exif tags from IMG_*_RGB.JPG to .TIF images
+
+for rgb in IMG_*_RGB.JPG; do
+	seqnum=`echo $rgb | sed -r "s/IMG_[0-9]+_[0-9]+_([0-9]+).*/\1/"`
+	echo $seqnum
+	exiv2 -PEVk --grep GPS $rgb > $rgb.tags
 
-# Copy GPS Exif tags from *RGB.JPG to .TIF images
-for rgb in *_RGB.JPG; do
 	for band in GRE NIR RED REG; do
-		tif=`echo $rgb | sed s/_RGB.JPG/_$band.TIF/`
-		exiv2 -PEVk --grep GPS $rgb > $rgb.tags
-		exiv2 -m $rgb.tags $tif
-		rm $rgb.tags
+		exiv2 -m $rgb.tags IMG_*_$seqnum\_$band.TIF
 	done
-done
 
-# Move into subfolder per band
-for band in RGB GRE NIR RED REG; do
-	mkdir $band
-	mv *_$band.* $band/
+	rm $rgb.tags
 done
diff --git a/contrib/sequoia/subfolder-per-band.sh b/contrib/sequoia/subfolder-per-band.sh
new file mode 100755
index 00000000..668224a1
--- /dev/null
+++ b/contrib/sequoia/subfolder-per-band.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# Move into subfolder per band
+for band in RGB GRE NIR RED REG; do
+	mkdir $band
+	mv IMG_*_$band.* $band/
+done