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Just like IR Ektachrome

Author	Post

Posted by jk: Thu Apr 12th, 2012 11:56

1^st Post

For many years I have been interested in trying to duplicate the effects that used to be obtained with colour IR Ektachrome.

Has anyone managed to find a technique in Photoshop that allows you to mimic this?

Obviuosly ther is also the possibility of changing the in camera CCD filter to take IR images and depending on the replacement filter then you can get similar effects.

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Posted by Eric: Thu Apr 19th, 2012 07:15

2^nd Post

Remind me what it should look like?

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Posted by jk: Thu Apr 19th, 2012 08:41

3^rd Post

The images look like this.
http://www.vividlight.com/articles/3113.htm

I like the effect/technique that produces images that look like Kodak Ektachrome Infrared with red filter or with green filter.

http://mikebr.smugmug.com/Other/Experimental/6892665_WCdkX8/1/497987175_qc9zn#!i=497987175&k=qc9zn

Also these.

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Posted by Eric: Thu Apr 19th, 2012 15:08

4^th Post

You can get a long way down that road by just using Channel mixing.

Select the green channel and play with the percentages.

If you first use the infamous 3key selection of light to mid tones, then invert it, you can protect the highlights from colour change. So a blue sky, for example, remains ......but the Foliage turns magenta.

Alternatively try converting the file to CMYK before starting. It can give some interesting variations on the theme.

When I get back to the desktop I will produce some samples....if you haven't cracked it by then?

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Posted by Eric: Thu Apr 19th, 2012 18:33

5^th Post

Here's some quick examples

Attachment: rgb.jpg (Downloaded 65 times)

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Posted by Eric: Thu Apr 19th, 2012 18:37

6^th Post

Heres a quick cmyk mix

Attachment: cmyk.jpg (Downloaded 65 times)

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Eric

Posted by Eric: Thu Apr 19th, 2012 18:43

7^th Post

A little more intensity

Attachment: channelmix2.jpg (Downloaded 63 times)

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Posted by Eric: Thu Apr 19th, 2012 18:47

8^th Post

Of course, back in the 60's when this film was around, much of life looked like this..... without a camera.

:rofl:

Attachment: 1965.jpg (Downloaded 63 times)

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Posted by Doug: Thu Apr 19th, 2012 19:28

9^th Post

Back in the day, I Loved EIR

Attachment: 01135001.jpg (Downloaded 57 times)

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Posted by Doug: Thu Apr 19th, 2012 19:46

10^th Post

Here's a few more

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Posted by jk: Fri Apr 20th, 2012 06:41

11^th Post

That is exactly what I am after.
Eric do you have post#8 version actionised yet ?

Or can you post details of how you got there.

Doug,
The girl with yellow/red colours is what I used to get.
EkIR was very interesting in the 70s.

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Posted by Eric: Fri Apr 20th, 2012 08:27

12^th Post

jk wrote:
That is exactly what I am after.
Eric do you have post#8 version actionised yet ?

Or can you post details of how you got there.

Doug,
The girl with yellow/red colours is what I used to get.
EkIR was very interesting in the 70s.

8? You surprise me!

I thought that was too off the wall and weird compared to the purer colour shifts of typical EkIR images??

Psycho images like that are easily done in curves.

Just place some fixed points along the straight line then drag the line between the curves up or down to different lengths. That's all I did for this image. The modified curve can be saved for later reuse but different images will recommend slightly different treatment, so you may then have to tweat the reulting curve.. For this reason there's no point in creating an action.

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Posted by jk: Fri Apr 20th, 2012 15:39

13^th Post

Sorry Eric I must have been psyched out I meant post#7

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Posted by Eric: Fri Apr 20th, 2012 17:54

14^th Post

jk wrote:
Sorry Eric I musthave been psyched out I meant post#7
Phew.

I thought you were on the wacky baccy. :praying:

I will have to do it again as I can't remember. :rofl:

I suspect I adjusted the Green channel as in #5. Then adjusted the blue channel. To boost the reds.

Will get back to you.

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Posted by jk: Sat Apr 21st, 2012 04:03

15^th Post

Thanks. I managed something similar in Bibble with some of the old plugins but I havent managed to recreate yet in ASP.

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Posted by Doug: Sat Apr 21st, 2012 13:15

16^th Post

Using Curves in Photoshop you can do the following

Command Click on a colour in the image (this will place a point on the curve on each channel)

Visit and adjust the point in each channel
eg.
If you command clicked on pure green the channel outputs might be 0,256,0 (RGB)
Change these to 256,0,0 and Green becomes Red

Do this for each colour that you want shifted (obviously this will have dramatic effects on other colours in the image)

If you wanted skin tones to be Orange you would work out the values (from the colour picker) and then adjust the output to match

This curve will work for those colours for all images taken under the same light/settings

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Posted by KirkP: Fri May 11th, 2012 00:53

17^th Post

Eric wrote: Of course, back in the 60's when this film was around, much of life looked like this..... without a camera.

:rofl:

Great comment... snorted tea through my nose for five minutes, thanks!

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Posted by steve of oxford: Mon Jun 11th, 2012 14:55

18^th Post

JK + pals

I can't remember if it had it or not, but have you looked at Alien Skin film simulation software?

It's a photoshop plugin I used to have, still got the software somewhere though I think my version will only work with CS.

I do seem to remember it did have something in there to do with IR, if I get my old comp set up again I could take a look for you.

As for removing the CCD filter, yes this is possible on some cameras. The Sigma is a real beauty for this...their filter is accessible directly through the lens mount and is designed to be user-interchangeable.

If your camera doesn't have a user removable filter, and you remove it, chances are you will have to filter before the lens.

Another option is to buy a forensic body which can be used in IR & UV modes, I'm a little rusty on this but I think one of the major brands did one, was it Fuji?

Edit: yes it was the Fuji S3 Pro UVIR. I'd love one of those.

Posted by jk: Wed Jul 11th, 2012 04:38

19^th Post

I have some AS software but I hadnt noticed this effect in the package.
I'll take another look. Thanks for the info.

I would love a new Fuji S3 UV/IR.
I used to have an ebay search for one but they dont seem to come up.

What Sigma model are you referring to?

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