Added simple script for generating presentational images with name-based conditional enhancements

presentation.sh

+#!/bin/bash
+
+#
+# Generates presentational copies for scanned pages.
+# Intended to be called from quack.sh to generate images to shown on the QA page.
+#
+# Override settings by creating "presentation.settings" and specifying DEFAULT_COMMANDS
+# and/or get_commands
+#
+
+SETTINGS="presentation.settings"
+
+# geometry resizes to 50% (the > is redundant with percents <= 100, but we keep it
+# as it is a fine default as we never want to enlarge).
+# unsharp is for a high quality 300 DPI scan with no previous sharpen applied.
+# level is highly source-specific. The default is a conservative starker contrast.
+# no intensities > 240.
+# Quality is for JPEG output. This needs to be quite high as JPEG artifacts are
+# very visible with tiny text.
+DEFAULT_COMMANDS="-geometry 50%x> -unsharp 0.8x0.1+0.8+2.0 -level 10,1.0,245 -quality 90"
+
+# Input: source
+# Output: COMMANDS (GraphicsMagick options)
+function get_commands() {
+    local SOURCE="$1"
+
+    if [ "." != ".`echo \"$SOURCE\" | grep -o inesta`" ]; then
+        # This provider has very dark scans with no intensities > 240
+        COMMANDS="-geometry 50%x> -unsharp 0.8x0.1+0.8+2.0 -level 0,1.0,230 -quality 90"
+        return
+    fi
+    if [ "." != ".`echo \"$SOURCE\" | grep -o pex`" ]; then
+        # This provider has scans practically without any blown high- or low-lights
+        COMMANDS="-geometry 50%x> -unsharp 0.8x0.1+0.8+2.0 -level 15,1.0,240 -quality 90"
+        return
+    fi
+    COMMANDS="$DEFAULT_COMMANDS"
+}
+
+pushd `dirname $0` > /dev/null
+ROOT=`pwd`
+if [ -e "$SETTINGS" ]; then
+    echo "Sourcing settings from $SETTINGS"
+    source "$SETTINGS"
+fi
+popd > /dev/null
+
+SOURCE="$1"
+DESTINATION="$2"
+
+if [ ! -f "$SOURCE" ]; then
+    echo "The image '$SOURCE' does not exist"
+    exit 2
+fi
+
+if [ "." == ".$DESTINATION" ]; then
+    echo "Usage: ./presentation.sh source destination"
+    exit 2
+fi
+
+get_commands "$SOURCE"
+gm convert "$SOURCE" $COMMANDS "$DESTINATION"