done

addwatermarktopdf.sh

@@ -0,0 +1,3 @@
+python3 burstpdf.py
+python3 stick.py
+./mergepdf.sh

burstpdf.py

@@ -0,0 +1,43 @@
+#Based in the code in https://iq.opengenus.org/pdf_to_image_in_python/
+
+import pdf2image
+from PIL import Image
+import time
+
+#DECLARE CONSTANTS
+PDF_PATH = "target.pdf"
+DPI = 200
+FIRST_PAGE = None
+LAST_PAGE = None
+FORMAT = 'png'
+THREAD_COUNT = 1
+USERPWD = None
+USE_CROPBOX = False
+STRICT = False
+
+def pdftopil():
+    #This method reads a pdf and converts it into a sequence of images
+    #PDF_PATH sets the path to the PDF file
+    #dpi parameter assists in adjusting the resolution of the image
+    #first_page parameter allows you to set a first page to be processed by pdftoppm
+    #last_page parameter allows you to set a last page to be processed by pdftoppm
+    #fmt parameter allows to set the format of pdftoppm conversion (PpmImageFile, TIFF)
+    #thread_count parameter allows you to set how many thread will be used for conversion.
+    #userpw parameter allows you to set a password to unlock the converted PDF
+    #use_cropbox parameter allows you to use the crop box instead of the media box when converting
+    #strict parameter allows you to catch pdftoppm syntax error with a custom type PDFSyntaxError
+
+    start_time = time.time()
+    pil_images = pdf2image.convert_from_path(PDF_PATH, dpi=DPI, first_page=FIRST_PAGE, last_page=LAST_PAGE, fmt=FORMAT, thread_count=THREAD_COUNT, userpw=USERPWD, use_cropbox=USE_CROPBOX, strict=STRICT)
+    print ("Time taken : " + str(time.time() - start_time))
+    return pil_images
+
+def save_images(pil_images):
+    d = 1
+    for image in pil_images:
+        image.save(("split/page%d"%d) + ".png")
+        d += 1
+
+if __name__ == "__main__":
+    pil_images = pdftopil()
+    save_images(pil_images)

mergepdf.sh

@@ -0,0 +1 @@
+convert "split/*.{png,jpeg}" -quality 100 outfile.pdf

stick.py

@@ -0,0 +1,27 @@
+from PIL import Image
+import PIL.ImageOps
+
+#open both the image and watermark
+image = Image.open('split/page1.png')
+logo = Image.open('merged.png')
+
+#rotate the watermark
+rotatedlogo = logo.rotate(18, expand=True)
+#invert the watermark
+invertedlogo = PIL.ImageOps.invert(rotatedlogo)
+invertedlogo.save('rotatedlogo.png')
+
+#rescaling the logo
+basewidth = 1050
+finallogo = Image.open("rotatedlogo.png")
+wpercent = (basewidth/float(finallogo.size[0]))
+hsize = int((float(finallogo.size[1])*float(wpercent)))
+finallogo = finallogo.resize((basewidth,hsize), Image.ANTIALIAS)
+
+#overlaying
+image_copy = image.copy()
+#if you want to position in the bottom right corner use:
+#position = ((image_copy.width - logo.width), (image_copy.height - logo.height))
+position = ((100), (750))
+image_copy.paste(finallogo, position)
+image_copy.save('split/page1.png')