diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 8511740..6f6ea91 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartjimp',
-  version: '1.0.10',
+  version: '1.0.11',
   description: 'a tool fr working with images in TypeScript'
 }
diff --git a/ts/smartjimp.classes.smartjimp.ts b/ts/smartjimp.classes.smartjimp.ts
index 9d37aeb..074dd01 100644
--- a/ts/smartjimp.classes.smartjimp.ts
+++ b/ts/smartjimp.classes.smartjimp.ts
@@ -1,6 +1,7 @@
 import * as plugins from './smartjimp.plugins.js';
 
-export interface IDimensions {
+export interface IAssetVariation {
+  format?: 'avif' | 'webp' | 'png';
   width?: number;
   height?: number;
 }
@@ -18,28 +19,36 @@ export class SmartJimp {
   private getCacheKey(
     sourceTypeArg: 'streamfile' | 'smartfile',
     sourceIdArg: string,
-    wantedDimensionsArg?: IDimensions
+    assetVariationArg?: IAssetVariation
   ) {
     return `${sourceTypeArg}_${sourceIdArg}_${
-      wantedDimensionsArg
-        ? `${wantedDimensionsArg.width || 'auto' }x${wantedDimensionsArg.height || 'auto'}`
+      assetVariationArg
+        ? `${assetVariationArg.width || 'auto' }x${assetVariationArg.height || 'auto'}`
         : 'original'
     }`;
   }
 
-  private async computeAssetVariation(assetBuffer: Buffer, wantedDimensions?: IDimensions) {
-    if (!wantedDimensions) {
-      return assetBuffer;
+  public async computeAssetVariation(assetBufferArg: Buffer, assetVariationArg?: IAssetVariation) {
+    if (!assetVariationArg) {
+      return assetBufferArg;
     }
-    let sharpImage = plugins.sharp(assetBuffer);
-    sharpImage = sharpImage.resize(wantedDimensions.width, wantedDimensions.height);
-    const result = await sharpImage.resize(wantedDimensions.width, wantedDimensions.height).avif().toBuffer();
-    return result;
+    let sharpImage = plugins.sharp(assetBufferArg);
+    sharpImage = sharpImage.resize(assetVariationArg.width, assetVariationArg.height);
+    const resultResize = sharpImage.resize(assetVariationArg.width, assetVariationArg.height);
+    switch (assetVariationArg.format) {
+      case 'avif':
+        sharpImage = resultResize.avif();
+      case 'webp':
+        sharpImage = resultResize.webp();
+      case 'png':
+        sharpImage = resultResize.png();
+    }
+    return sharpImage.toBuffer();
   }
 
   public async getFromSmartfile(
     smartfileArg: plugins.smartfile.SmartFile,
-    wantedDimensionsArg?: IDimensions
+    wantedDimensionsArg?: IAssetVariation
   ) {
     const cacheKey = this.getCacheKey('smartfile', await smartfileArg.getHash(), wantedDimensionsArg);
     const existingCacheEntry = await this.levelCache.retrieveCacheEntryByKey(cacheKey);