Background images leave a border

Question

Having to put a background image for the title page of a book I've used the following lines in the preamble:
usepackage{tikz}
usetikzlibrary{positioning}
usepackage{xcolor}
usepackage{graphics}
usepackage{eso-pic}
newcommandBackgroundPic{%
put(0,0){%
parbox[b][paperheight]{paperwidth}{%
vfill
centering
includegraphics[width=paperwidth,height=paperheight,%
keepaspectratio]{background.jpg}%
vfill
}}}

and then this right after the begin{document}:
AddToShipoutPicture*{BackgroundPic}

(The code has been taken from here: How to create a background image on title page with LaTeX?)
The image was indeed loaded but it leaves a white border above and below, as you can see in the screenshot, which I would like to erase.

Can anyone help me?

epR8GaYuh · Accepted Answer

The
includegraphics[width=paperwidth,height=paperheight,keepaspectratio]{background.jpg}

command uses the keepaspectratio option which might induce such whitespace if the aspect ratio of the document and the image do not match.
There are multiple solutions for this:

Remove the keepaspectratio option. This will stretch the image in the Y dimension in your case. As it will leave you with a distorted image, this might not be the best option.

Use an image whose aspect ratio matches the one of the document. This might be hard depending on your document.

Scale the image to fit the document, for example using something like
includegraphics[width=1.2paperwidth,height=paperheight,keepaspectratio]{background.jpg}

Please note that this solution will give you a "Overfull hbox" warning. Additionally some content will be hidden.

Background images leave a border

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