Create app.py

app.py

@@ -0,0 +1,117 @@
+import streamlit as st
+from PIL import Image
+import io
+import traceback
+import time
+
+def compress_image(image, format='webp', quality=85):
+    try:
+        # Korrektur: Wandle 'jpg' in 'jpeg' um
+        save_format = 'jpeg' if format.lower() == 'jpg' else format
+        
+        # Korrektur: Quality-Wert wird umgekehrt angewendet
+        adjusted_quality = 101 - quality  # Dies dreht die Skala um
+        
+        img_byte_arr = io.BytesIO()
+        image.save(img_byte_arr, format=save_format.upper(), quality=adjusted_quality)
+        img_byte_arr.seek(0)
+        return Image.open(img_byte_arr)
+    except Exception as e:
+        st.error(f"Image compression error: {e}")
+        st.error(traceback.format_exc())
+        return None
+
+def main():
+    st.title("Image optimization tool")
+    
+    st.sidebar.header("Optimization settings")
+    
+    uploaded_file = st.file_uploader("Select an image", type=['jpg', 'png', 'jpeg', 'webp'])
+    
+    if uploaded_file is not None:
+        try:
+            original_image = Image.open(uploaded_file)
+            
+            current_format = original_image.format.lower() if original_image.format else uploaded_file.name.split('.')[-1].lower()
+            current_format = 'jpeg' if current_format == 'jpg' else current_format
+            
+            st.subheader("Original image")
+            st.image(original_image, caption=f"Original image ({current_format.upper()})")
+            
+            original_size_bytes = len(uploaded_file.getvalue())
+            st.write(f"Original image size: {original_size_bytes} Bytes")
+            
+            compression_quality = st.sidebar.slider(
+                "Compression quality (100 = best quality, 1 = smallest file)", 
+                min_value=1, 
+                max_value=100, 
+                value=85
+            )
+            
+            target_formats = [fmt for fmt in ['webp', 'jpg', 'png'] if fmt != current_format]
+            
+            target_format = st.sidebar.selectbox(
+                "Target format", 
+                target_formats
+            )
+            
+            st.warning("⚠️ Please click 'Optimize Image' ONLY ONCE'!")
+            
+            progress_bar = st.progress(0)
+            
+            if st.button("Optimize image"):
+                try:
+                    progress_bar.progress(20)
+                    time.sleep(0.5)
+                    
+                    optimized_image = compress_image(
+                        original_image, 
+                        format=target_format, 
+                        quality=compression_quality
+                    )
+                    
+                    progress_bar.progress(60)
+                    time.sleep(0.5)
+                    
+                    if optimized_image:
+                        save_format = 'jpeg' if target_format.lower() == 'jpg' else target_format
+                        
+                        img_byte_arr = io.BytesIO()
+                        optimized_image.save(img_byte_arr, format=save_format.upper(), quality=101-compression_quality)
+                        img_byte_arr.seek(0)
+                        
+                        progress_bar.progress(100)
+                        time.sleep(0.5)
+                        
+                        optimized_size_bytes = img_byte_arr.getbuffer().nbytes
+                        compression_ratio = (1 - optimized_size_bytes / original_size_bytes) * 100
+                        
+                        st.subheader("Optimization results")
+                        col1, col2 = st.columns(2)
+                        
+                        with col1:
+                            st.image(optimized_image, caption=f"Optimized ({target_format.upper()})")
+                        
+                        with col2:
+                            st.write(f"Original size: {original_size_bytes} Bytes")
+                            st.write(f"Optimized size: {optimized_size_bytes} Bytes")
+                            st.write(f"Compression rate: {compression_ratio:.2f}%")
+                        
+                        st.download_button(
+                            label=f"Download {target_format.upper()}",
+                            data=img_byte_arr,
+                            file_name=f"optimized_image.{target_format}",
+                            mime=f"image/{target_format}"
+                        )
+                    
+                    progress_bar.empty()
+                
+                except Exception as e:
+                    st.error(f"Image optimization error: {e}")
+                    progress_bar.empty()
+        
+        except Exception as e:
+            st.error(f"Error loading image: {e}")
+
+if __name__ == "__main__":
+    main()