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Create app.py
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app.py
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import streamlit as st
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from PIL import Image
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import io
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import numpy as np
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from image_optimization_utils import (
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compress_image,
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convert_image_format,
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resize_image
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)
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def main():
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st.title("Bild Optimierungs-Tool")
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# Seitenleiste für Einstellungen
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st.sidebar.header("Optimierungseinstellungen")
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# Datei-Upload
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uploaded_file = st.file_uploader("Wählen Sie ein Bild", type=['jpg', 'png', 'jpeg', 'webp'])
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if uploaded_file is not None:
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# Bild laden
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original_image = Image.open(uploaded_file)
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# Vorschau des Originalbildes
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st.subheader("Originalbild")
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st.image(original_image, caption="Ursprüngliches Bild")
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# Kompressionseinstellungen
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compression_quality = st.sidebar.slider(
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"Kompressionsqualität",
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min_value=1,
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max_value=100,
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value=85
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)
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# Zielformate
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target_formats = st.sidebar.multiselect(
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"Zielformate",
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['jpg', 'png', 'webp'],
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default=['webp']
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)
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# Optimierungsbutton
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if st.button("Bild optimieren"):
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# Optimierungsergebnisse
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results = {}
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for format in target_formats:
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# Bild komprimieren und konvertieren
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optimized_image = convert_image_format(
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original_image,
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target_format=format,
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quality=compression_quality
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)
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# Speichern im Speicher
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img_byte_arr = io.BytesIO()
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optimized_image.save(img_byte_arr, format=format.upper(), quality=compression_quality)
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img_byte_arr = img_byte_arr.getvalue()
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# Größenberechnung
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original_size = len(uploaded_file.getvalue())
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optimized_size = len(img_byte_arr)
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compression_ratio = (1 - optimized_size / original_size) * 100
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# Ergebnisse speichern
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results[format] = {
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'image': optimized_image,
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'original_size': original_size,
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'optimized_size': optimized_size,
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'compression_ratio': compression_ratio
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}
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# Ergebnisse anzeigen
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st.subheader("Optimierungsergebnisse")
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for format, result in results.items():
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col1, col2 = st.columns(2)
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with col1:
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st.image(result['image'], caption=f"Optimiert ({format.upper()})")
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with col2:
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st.write(f"Ursprüngliche Größe: {result['original_size']} Bytes")
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st.write(f"Optimierte Größe: {result['optimized_size']} Bytes")
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st.write(f"Kompressionsrate: {result['compression_ratio']:.2f}%")
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# Download-Button
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img_byte_arr = io.BytesIO()
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result['image'].save(img_byte_arr, format=format.upper(), quality=compression_quality)
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st.download_button(
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label=f"Download {format.upper()}",
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data=img_byte_arr.getvalue(),
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file_name=f"optimized_image.{format}",
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mime=f"image/{format}"
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)
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# Hilfsfunktionen in separater Datei image_optimization_utils.py
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