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Converting list of images to PDF in Ubuntu
Let’s use ImageMagick tool. Normally it is installed in Ubuntu. If you need to install it then run:

$ sudo apt-get install imagemagick

Then you can convert it by using:
$ convert image_1.jpg image_2.jpg output.pdf

You can specify any numbers of images but the last argument must be a name of your PDF file along with extension (.pdf).

Adding the watermark in the PDF file
We use Python script for adding watermark to each page in the PDF file. We will be using “PyPDF2” python library.

$ pip install PyPDF2

Make your watermark ready, convert it to PDF file. Make sure that watermark file is of same page size as of your PDF file.

Then run this code by modifying the file names:

import PyPDF2

originalFile = open('inputfile_pdf', 'rb')
pdfReader = PyPDF2.PdfFileReader(originalFile)
pdfWriter = PyPDF2.PdfFileWriter()

for i in range(0, pdfReader.numPages):
    originalfile_page = pdfReader.getPage(i)
    pdfWatermarkReader = PyPDF2.PdfFileReader(open('watermark.pdf', 'rb'))
    originalfile_page.mergePage(pdfWatermarkReader.getPage(0))
    pdfWriter.addPage(originalfile_page)

resultPdfFile = open('watermarked_outputfile.pdf', 'wb')
pdfWriter.write(resultPdfFile)
originalFile.close()
resultPdfFile.close()

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