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Kolarivision IR Chrome 'Aerochrome' filter

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#81 Cadmium

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Posted 21 October 2019 - 07:30

Please explain to Andy Broomé how to make his orange shots look red. Help him, help Birna, etc.... :smile:
He has sent me the exact same balcony shot (as seen in your orange version in the link below) using the Hrommagicus filter which looks red SOOC instead of orange.
https://www.ultravio...dpost__p__30185

Edited by Cadmium, 21 October 2019 - 07:43.


#82 Andrea B.

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Posted 07 January 2020 - 19:47

Cadmium writes: I would buy one myself, if I thought it would work. But I have B-410, and I think this is a B-140 stack, and I have never been able to make B-410 look really red.

Attached is a repeat of a B-410 photo. Is this "really red"? I can make it redder a different red.
And here is how I Turned Orange into Red: Hoya B-410 Red Blocker --> EIR: Photo Ninja Tutorial
I put this photo into Photoshop Elements and clicked around in the red with the dropper.
I saw readings of 1°, 3°, 6°, 358°, etc. So this is definitely Red.


Attached Image: lochbroomb410.jpg
Andrea G. Blum
Often found hanging out with flowers & bees.

#83 Andrea B.

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Posted 07 January 2020 - 20:03

Cadmium, I have with total respect "borrowed" this image to illustrate turning orange to red for a B-410.


Using Capture NX2, put one color point on the orange and turn the colour wheel from orange to red. The small orange square in the Color Picker shows the original orange. The large square shows the new Red.
It only takes an approximate 15° turn of the color wheel.
Of course this method is sadly archaic since nobody can use NX2 any more unless they have a very old operating system. So now I have to use Photo Ninja for this.
Attached Image: Screen Shot 2020-01-07 at 12.59.42 PM.jpg


Attached Image: cadmium.jpg


It took two trips thru Photo Ninja to get this version.
(I worked too fast and oversaturated the red which wrecked some detail. Sorry 'bout that.)
((And I oversaturated the green. Geez, Andrea, you are heavy handed today.))
Attached Image: cadorigpnpn.jpg


The point of the preceding tweak is to point out that the B-410 orange is only about 15° off of Red. So it only takes a minor tweak to turn B-410 Orange to Red. I don't currently have a channel mixer, but that could also be used. The easiest ever method was the NX2 color point. I think color points live on in a DxO app, but I don't have that so am learning other methods now.



To be sure, I do understand the desire to have the Aerochrome look arrive already red & blue SOOC.



Andrea G. Blum
Often found hanging out with flowers & bees.

#84 Cadmium

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Posted 07 January 2020 - 21:52

Are you 'being bad' today, Andrea? :wink:
https://www.ultravio...__fromsearch__1

YIKES!!! To me it looks like someone tweaked it. I little unnatural. It looks over saturated, kind of like spray paint. Seriously.
I am trying to figure out which one of my photo you used for that tweak?

OK, I found the one you used.
Here is the original Hoya B-410 2mm + KG3 2mm stack shot.
Attached Image: B410_KG_3mm_1280.jpg

Edited by Cadmium, 07 January 2020 - 22:07.


#85 Andrea B.

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Posted 08 January 2020 - 18:52

Yes, Cadmium I was very bad. But people keep doing this. So I've kind of given up. It is probably not something I need to be worrying about given the multitude of other chores I'm behind on getting done for UVP. I'll probably remove that "forum courtesy" post. We need to promote experimentation here on UVP so that we all learn.
*****

Yes, of course, the red shifted photo looks spray-painted. The color shift and saturation shift were done on a resized JPG. That is guaranteed to destroy some detail! This does not happen if the tweaks are applied to a raw file where you can control things better. You can see that in the tutorial.
Andrea G. Blum
Often found hanging out with flowers & bees.