[Tex/LaTex] Make watermark image lighter (more transparent)

watermark

I need to display my college logo as watermark in certificate only…
i tried with \usepackage{draftwatermark}
and

\SetWatermarkText{\includegraphics{filename}}
\SetWatermarkAngle{0}
\SetWatermarkScale{0.45}
\SetWatermarkColor[rgb]{0,1,0}
\SetWatermarkLightness{1}

…..everything is fine except lightness..image is displaying as it is…so the text is not visible .Is there any other commands.
for watermark certificate and lightness should be very low.

Best Answer

As you observe, \SetWatermarkLightness only really affects plain text part of the watermark. Using tikz you can specify transparency, or rather opacity: value 0 will be invisible, 1 will give the usual image:

Sample output

\documentclass{article}

\usepackage[firstpage]{draftwatermark}
\usepackage{tikz}
\SetWatermarkText{\tikz{\node[opacity=0.2]{\includegraphics{example-image-a}};}}
\SetWatermarkAngle{0}
\SetWatermarkScale{0.45}
\SetWatermarkColor[rgb]{0,1,0}
\SetWatermarkLightness{1}

\usepackage{lipsum}

\begin{document}

\lipsum[1-10]

\end{document}
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