Grayscale to Rainbow style infrared conversion how?

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Posted By
wrreisen2
Apr 24, 2007
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523
Replies
3
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Closed
When you get a grayscale image from an infrared camera like this one:

http://www.ir55.com/images/White%20hot%20WH%20Thermal%20infr ared%20human%20face%20image.jpg

How with photoshop would you change it to a rainbow image like this one:

http://www.ir55.com/images/12wehjsdenew-2.jpg

Would you use a special filter or would some manipualation with image adjustments do it?

Thanks for any advice.

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AM
Andrew Morton
Apr 24, 2007
wrote:
When you get a grayscale image from an infrared camera like this one:
http://www.ir55.com/images/White%20hot%20WH%20Thermal%20infr ared%20human%20face%20image.jpg
How with photoshop would you change it to a rainbow image like this one:

http://www.ir55.com/images/12wehjsdenew-2.jpg

Would you use a special filter or would some manipualation with image adjustments do it?

Image->Mode->RGB color
Image->Adjustments->Gradient Map and choose a gradient.

Andrew
GH
Gisle Hannemyr
Apr 24, 2007
writes:
When you get a grayscale image from an infrared camera like this one:

http://www.ir55.com/images/White%20hot%20WH%20Thermal%20infr ared%20human%20face%20image.jpg
How with photoshop would you change it to a rainbow image like this one:

http://www.ir55.com/images/12wehjsdenew-2.jpg

Would you use a special filter or would some manipualation with image adjustments do it?

The simplest would be to use the gradient tool in Photoshop. Just apply a suitable colour gradient, and there you are! —
– gisle hannemyr [ gisle{at}hannemyr.no – http://hannemyr.com/photo/ ] ———————————————————— ———— Sigma SD10, Kodak DCS460, Canon Powershot G5, Olympus 2020Z ———————————————————— ————
MB
Martin Brown
Apr 24, 2007
On Apr 24, 1:43 pm, wrote:
wrote:
Is there a filter or method in photoshop of taking a grayscale infrared image:

http://www.ir55.com/images/White%20hot%20WH%20Thermal%20infr ared%20human%20face%20image.jpg
and turning it into an image similar to here:

http://www.ir55.com/images/12wehjsdenew-2.jpg

www.ir55.com/infrared_IR_camera.html

Where the brightest bits are red and then slightly duller yellow then green then blue being the dullest.

You turn the original image into an 256 colour indexed bitmap and then rewrite the colour lookup table to match your idea of a cute false colour scheme or to bring out the detail you want emphasised. Various false colour tables are popular for different scientific applications.

One minor problem is that a consumer grade digital camera can only image in near IR so there is no way to convert image brightness to temperature in the same way that a thermal imager does.
(I would be taking a grayscale infrared photo with a camera then hoping to colour it in this way).

Unless you have access to a far IR camera with a germanium lens you can’t really get the same results. Easy enough to have white foliage on the trees with a near IR filter though.

Regards,
Martin Brown

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