I have a poster in which I need to place several logos in pdf format. For this I use the textpos package together with includegraphics. Why do these logos disappear on the pdf file after the tex is pdflatexed?

\documentclass[11pt, oneside, A4paper,final,leqno]{article}



  \node[shape=circle,draw,inner sep=1.93812pt, color=blue] (char) {#1};}}





\scalebox{.672597892}{\bf Vietnam Mathematical Competition}

\begin{textblock}{20.5}(10.2, 1.)

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    If I replace your pdflogo whith example-image the images appears in the output. Apart fom that: Are you sure that the article documentclass is a good choice for producing a poster? Why not use one of the documentclasses specially dedicated to produce posters that are listed here: How to create posters using LaTeX – leandriis Jan 11 '19 at 9:57
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    Also, it should be 'a4paper', not 'A4paper'. – Ian Thompson Jan 11 '19 at 9:58
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    Further to the comment by @leandriis, my guess would be that there is white space around the logo. You might need to crop it. – Ian Thompson Jan 11 '19 at 9:59
  • I can view all the logos in the internal viewer of Texstudio. But I can not view the logos when open the pdf file using external pdf adobe. – Thumbolt Jan 11 '19 at 10:13
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    Can you make the files available for download and add a link here? – Ian Thompson Jan 11 '19 at 10:14

There are several issues with position and scale that seem to be pushing the image off the page

in addition to setting


I also substituted

\begin{textblock}{20.5}(10.2, 1.)

with the following, they may not be ideal values but they fit better

\begin{textblock}{10.5}(1.2, 1.)

This pulls the image left and into view,
I cant test in adobe but I can see the image mid page in other viewers

enter image description here

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