An illustration to show that oversaturation or under/over exposure can't be corrected later on. Details are lost forever.
<p>Images from left to right, top to bottom:
</p>
<ul><li>Original</li>
<li>Over the limit of sRGB colorspace enhanced saturation (e.g. oversaturated photography)</li>
<li>Reverted/corrected saturation to match original using previous as input</li>
<li>Difference between original and reverted image, using gray as bias.</li>
<li>Original</li>
<li>Contrast enhancement to simulate over/under exposure</li>
<li>Previous result corrected to original</li>
<li>Difference between original and corrected image, using gray as bias.</li></ul>
<ul><li><b>Original: </b> <a href="//commons.wikimedia.org/wiki/User:Niabot" title="User:Niabot">User:Niabot</a></li>
<li><b>Derivative work: </b> <a href="//commons.wikimedia.org/wiki/User:Niabot" title="User:Niabot">User:Niabot</a></li></ul>
CC BY-SA 3.0
This file was derived from: <a href="//commons.wikimedia.org/wiki/File:Dojikko.png" title="File:Dojikko.png">Dojikko.png</a><br>