This isn't something you should alter on your own. As a general rule, companies have brand standards that define how their logos are allowed to be used (what can it be placed on, font, size, spacing between words and graphic elements, border space between the logo other graphics, colors, etc...). Usually there is an official version of the logo for most uses, and a few alternate-colored versions for problematic backgrounds.
National Instruments
appears to have a team that you can contact to find out what you are allowed to do. According to the page I linked, you need to email
logopermissionrequests@ni.com, and they'll tell you what the rules are, and if it's ok, they'll give you the correct graphic to use.