<p>screenshot of the file page of <a href="//commons.wikimedia.org/wiki/File:BlueCyanGreen.png" title="File:BlueCyanGreen.png">File:BlueCyanGreen.png</a> with a table showing also its thumbnail (and those of related images)
</p>
The correct shades of blue and green are shown in the original PNG, but not in the thumbnail in the table. (They can also be seen in the table's HTML row.)
<a href="//commons.wikimedia.org/wiki/User:Watchduck" title="User:Watchduck">Watchduck</a>
<span class="int-own-work" lang="en">Own work</span>