🚀 go-pugleaf

wrreisen2@yahoo.com wrote:
> When you get a grayscale image from an infrared camera like this one:
>
> http://www.ir55.com/images/White%20hot%20WH%20Thermal%20infrared%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 

On Apr 24, 1:43 pm, wrreis...@yahoo.com wrote:
wrreisen2@yahoo.com wrote:
> Is there a filter or method in photoshop of taking a grayscale
> infrared image:
>
> http://www.ir55.com/images/White%20hot%20WH%20Thermal%20infrared%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