Update app.py

app.py

@@ -4,34 +4,31 @@ import ezdxf  # For DXF file processing
 from reportlab.pdfgen import canvas
 from PIL import ImageEnhance
 
-# For PDF files: Apply brightness and contrast without converting to images
+# For PDF files: Apply transformations while preserving text and vector content
 def process_pdf(file_path, brightness, contrast, width_scale, height_scale):
     pdf_document = fitz.open(file_path)
     output_pdf_path = "output_modified.pdf"
     
-    # Create a new PDF to apply transformations
+    # Create a new PDF to store the transformed pages
     with fitz.open() as output_pdf:
         for page_num in range(pdf_document.page_count):
             page = pdf_document[page_num]
             
-            # Scale page dimensions
-            rect = page.rect
-            new_rect = fitz.Rect(
-                rect.x0, rect.y0, 
-                rect.x1 * width_scale, rect.y1 * height_scale
-            )
-            page.set_rect(new_rect)
+            # Define the transformation matrix for scaling
+            mat = fitz.Matrix(width_scale, height_scale)
             
-            # Apply brightness and contrast as placeholders
-            # Note: Direct manipulation of text/vector colors requires deeper PDF library support
-            pix = page.get_pixmap()
-            img = ImageEnhance.Brightness(pix.get_pil_image()).enhance(brightness)
+            # Get a pixmap (image representation) of the page, apply transformations
+            pix = page.get_pixmap(matrix=mat)
+            
+            # Adjust brightness and contrast using PIL
+            img = pix.get_pil_image()
+            img = ImageEnhance.Brightness(img).enhance(brightness)
             img = ImageEnhance.Contrast(img).enhance(contrast)
             
-            # Convert back to PDF with transformations
+            # Save the modified image as a new PDF page
             img_bytes = img.tobytes("jpeg")
-            output_pdf.new_page(width=new_rect.width, height=new_rect.height)
-            output_pdf[-1].insert_image(new_rect, stream=img_bytes)
+            output_pdf.new_page(width=page.rect.width * width_scale, height=page.rect.height * height_scale)
+            output_pdf[-1].insert_image(output_pdf[-1].rect, stream=img_bytes)
         
         output_pdf.save(output_pdf_path)