--- a/pkg/geoserver/templates.go	Wed Sep 04 14:39:51 2019 +0200
+++ b/pkg/geoserver/templates.go	Wed Sep 04 15:30:08 2019 +0200
@@ -11,6 +11,7 @@
 // Author(s):
 //  * Sascha L. Teichmann <sascha.teichmann@intevation.de>
 //  * Markus Kottländer <markus.kottlaender@intevation.de>
+//  * Bernhard Reiter <bernhard.reiter@intevation.de>
 
 package geoserver
 
@@ -18,6 +19,7 @@
 	"context"
 	"database/sql"
 	"regexp"
+	"strconv"
 	"strings"
 	"text/template"
 
@@ -54,6 +56,9 @@
 }
 
 func templateConfigValues(tmplTxt string) (string, error) {
+	// As SLDs cannot handle opacity as hex part of the color setting
+	// we split out the 7-8 chars of keys ending on "_fill" color settings
+	// into keys ending on "_fill_opacity"
 	tmpl, err := template.New("template").Parse(tmplTxt)
 	if err != nil {
 		return "", err
@@ -61,11 +66,45 @@
 
 	// Try to extract the needed keys from the template.
 	keys := extractKeysFromTemplate(tmplTxt)
+
+	// filter out keys ending on "_opacity" and put them in their own slice
+	var opacityKeys []string
+	n := 0
+	for _, key := range keys {
+		if strings.HasSuffix(key, "_opacity") {
+			opacityKeys = append(opacityKeys, key)
+		} else {
+			keys[n] = key
+			n++
+		}
+	}
+	keys = keys[:n]
+
 	kv, err := loadConfigValues(keys)
 	if err != nil {
 		return "", err
 	}
 
+	// if there convert opacity hex value into float between 0-1
+	// otherwise just use 1.0
+	for _, opacityKey := range opacityKeys {
+		fillKey := opacityKey[0 : len(opacityKey)-8]
+		fillValue := kv[fillKey]
+		if fillValue != "" && len(fillValue) == 9 {
+			opacity, err := strconv.ParseInt(fillValue[7:9], 16, 0)
+			if err == nil {
+				kv[opacityKey] = strconv.FormatFloat(
+					float64(opacity)/255, 'f', 2, 64)
+				kv[fillKey] = kv[fillKey][0:7]
+			} else {
+				return "", err
+			}
+
+		} else {
+			kv[opacityKey] = "1.0"
+		}
+	}
+
 	var buf strings.Builder
 	if err = tmpl.Execute(&buf, kv); err != nil {
 		return "", err