fix: Improved base64 image handling and Windows compatibility

encode_image.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+
+# Check if an image file is provided
+if [ $# -lt 1 ]; then
+    echo "Usage: $0 <image_file> [output_file]"
+    echo "Example: $0 test.png base64_output.txt"
+    exit 1
+fi
+
+IMAGE_FILE="$1"
+OUTPUT_FILE="${2:-}"  # Use the second argument as output file, if provided
+
+# Check if the image file exists
+if [ ! -f "$IMAGE_FILE" ]; then
+    echo "Error: Image file '$IMAGE_FILE' does not exist."
+    exit 1
+fi
+
+# Get the file extension and determine MIME type
+FILE_EXT="${IMAGE_FILE##*.}"
+MIME_TYPE="application/octet-stream"  # Default MIME type
+
+case "$FILE_EXT" in
+    png|PNG)
+        MIME_TYPE="image/png"
+        ;;
+    jpg|jpeg|JPG|JPEG)
+        MIME_TYPE="image/jpeg"
+        ;;
+    gif|GIF)
+        MIME_TYPE="image/gif"
+        ;;
+    webp|WEBP)
+        MIME_TYPE="image/webp"
+        ;;
+    *)
+        echo "Warning: Unknown file extension. Using generic MIME type."
+        ;;
+esac
+
+# Convert image to base64
+echo "Converting '$IMAGE_FILE' to base64..."
+
+# Different commands based on OS
+if [ "$(uname)" == "Darwin" ]; then
+    # macOS
+    BASE64_DATA="data:$MIME_TYPE;base64,$(base64 -i "$IMAGE_FILE")"
+else
+    # Linux and others
+    BASE64_DATA="data:$MIME_TYPE;base64,$(base64 -w 0 "$IMAGE_FILE")"
+fi
+
+# Output the base64 data
+if [ -n "$OUTPUT_FILE" ]; then
+    # Save to file if output file is specified
+    echo "$BASE64_DATA" > "$OUTPUT_FILE"
+    echo "Base64 data saved to '$OUTPUT_FILE'"
+    echo "Total length: ${#BASE64_DATA} characters"
+else
+    # Display a preview and length if no output file
+    echo "Base64 Image Data (first 100 chars):"
+    echo "${BASE64_DATA:0:100}..."
+    echo "Total length: ${#BASE64_DATA} characters"
+    
+    echo ""
+    echo "To use with MCP server in multi_image_analysis:"
+    echo '{
+  "images": [
+    {
+      "url": "'"${BASE64_DATA:0:20}"'... (full base64 string)"
+    }
+  ],
+  "prompt": "Please describe this image in detail. What does it show?",
+  "model": "qwen/qwen2.5-vl-32b-instruct:free"
+}'
+fi
+
+exit 0