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Subject: OT: Tech question about "Auto Adjust Colors"

linkdink opened this issue on Nov 13, 2008 · 5 posts
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linkdink ( ) posted Thu, 13 November 2008 at 10:52 PM · edited Fri, 04 October 2024 at 8:18 AM

Content Advisory! This message contains nudity

file_417850.jpg

I use [Ifranview](http://www.irfanview.com/) for a lot of quick graphical tasks.  Among its features is the ability to "Auto Correct Colors" (Shift U).

I don't rely on this feature, preferring to do this manually, but sometimes I apply it because I am curious to see what adjustments it will make.

Today I applied it to a black and white image, and lo and behold, it recreated the gold colors of the background.

Question: how does it know what the original colors were? Is this color information somehow saved in the file?

Here's the black and white, and the auto-corrected version next.

Gallery

linkdink ( ) posted Thu, 13 November 2008 at 10:52 PM

Content Advisory! This message contains nudity

file_417851.jpg

Auto color corrected.

Gallery

ockham ( ) posted Thu, 13 November 2008 at 11:01 PM

Irfan is magic.  I knew it all along.

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ockham ( ) posted Fri, 14 November 2008 at 9:47 AM · edited Fri, 14 November 2008 at 9:48 AM

file_417881.jpg

More seriously, it could be that your picture was actually a color image with the saturation turned way down, so that it looked like grayscale.   Here's what happened when I tried this........

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linkdink ( ) posted Fri, 14 November 2008 at 1:38 PM

Yes, I think on closer inspection that is the case. I think that there was a bit of gold left in the picture that it picked up on and fully saturated. Thanks for your reply.

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