diff --git a/schema.json b/schema.json
index 2c19dfa09..5385a5373 100644
--- a/schema.json
+++ b/schema.json
@@ -90,6 +90,30 @@
                 },
                 "gammaValue": {
                     "type": "number"
+                },
+                "vendorOption": {
+                    "$ref": "http://geostyler/geostyler-style.json#/definitions/ContrastEnhancementVendorOption",
+                    "description": "A ContrastEnhancementVendorOption defines the algorithm to apply for Normalize contrast enhancement."
+                }
+            },
+            "type": "object"
+        },
+        "ContrastEnhancementVendorOption": {
+            "description": "A ContrastEnhancementVendorOption defines the algorithm to apply for Normalize contrast enhancement.",
+            "properties": {
+                "algorithm": {
+                    "enum": [
+                        "ClipToMinimumMaximum",
+                        "ClipToZero",
+                        "StretchToMinimumMaximum"
+                    ],
+                    "type": "string"
+                },
+                "maxValue": {
+                    "type": "number"
+                },
+                "minValue": {
+                    "type": "number"
                 }
             },
             "type": "object"
@@ -300,6 +324,17 @@
                     "description": "A color defined as a hex-color string.",
                     "type": "string"
                 },
+                "format": {
+                    "description": "The format (MIME type) of the image provided.",
+                    "enum": [
+                        "image/gif",
+                        "image/jpeg",
+                        "image/jpg",
+                        "image/png",
+                        "image/svg+xml"
+                    ],
+                    "type": "string"
+                },
                 "haloBlur": {
                     "description": "The halo's fadeout distance towards the outside.",
                     "type": "number"
diff --git a/style.ts b/style.ts
index efa0488fc..9081abb97 100644
--- a/style.ts
+++ b/style.ts
@@ -359,6 +359,10 @@ export interface IconSymbolizer extends BasePointSymbolizer {
    * A path/URL to the icon image file.
    */
   image?: string;
+  /**
+   * The format (MIME type) of the image provided.
+   */
+  format?: `image/${'png' | 'jpg' | 'jpeg' | 'gif' | 'svg+xml'}`;
   /**
    * If true, the icon will be kept upright.
    */
@@ -549,12 +553,22 @@ export interface ColorMap {
   extended?: boolean;
 }
 
+/**
+ * A ContrastEnhancementVendorOption defines the algorithm to apply for Normalize contrast enhancement.
+ */
+export interface ContrastEnhancementVendorOption {
+  algorithm: 'StretchToMinimumMaximum' | 'ClipToMinimumMaximum' | 'ClipToZero';
+  minValue?: number;
+  maxValue?: number;
+}
+
 /**
  * A ContrastEnhancement defines how the contrast of image data should be enhanced.
  */
 export interface ContrastEnhancement {
   enhancementType?: 'normalize' | 'histogram';
   gammaValue?: number;
+  vendorOption?: ContrastEnhancementVendorOption;
 }
 
 /**