Hi Carol,
As I understand, the picture library consists of files named IMG1234, IMG1235 and so on after you upgrade SharePoint site to SharePoint 2013. And you want to hide file name.
Is the IMG 1234 prefix or suffix in the file name? Could you provide the screen shot about the issue? How do you want to hide the file name?
1. If you want to hide the file name in the view, you could modify the view.
If you use the all picture view, you could modify the view and hide the column in the column section in the library setting.
If you use the Thumbnails view, you could hide the filename by code. There is a code demon below.
<script src="http://code.jquery.com/jquery-1.10.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$(".ms-tileview-tile-detailsBox").each(function () {
$(this).find("ul > li:eq(0)").html("");
});
});
</script>
2. If you want to replace the value of the title column, you could achieve it by PowerShell command. For more detailed information, you could refer to the article below.
The article below is about Updating a Field in a Document Library with PowerShell.
http://www.craigjahnke.com/updating-a-field-in-sharepoint-with-powershell/
Best regards,
Sara Fan
TechNet Community Support
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