blue rock using led lights · AditNow Community

Boggy
50.2% (Neutral)
Newbie Topic Starter

17 years ago

is it just nenthead or is blue patches just a side effect of led lighting when taking pictures on certain rocks.

🔗Smallcleugh-Lead-Mine-User-Album-Image-524[linkphoto]Smallcleugh-Lead-Mine-User-Album-Image-524[/linkphoto][/link]

if its a hole explore it...

LAP
50.2% (Neutral)
Newbie

17 years ago

#2

I too noticed that. I think it's something to with the colour of rock itself and the rate of which it re-emmits light shining upon it (i.e. - how wet it is)
For instance Smallcleugh's walls obsorb light very quickly due to their dryness, and are of a greyish colour, which makes blue light more prodominent.

Kein geneis kanaf - Cain gnais canaf
Byt vndyd mwyhaf - byth onddyth moyav
Lliaws a bwyllaf - Líows o boylav
Ac a bryderaf - ac o boryddarav
Kyfarchaf y veird byt - covarcav yr vairth
Pryt nam dyweid - poryth na'm dowaith
Py gynheil y byt - Pa gonail y byth
Na syrch yn eissywyt - na soroc yn eishoyth
Neur byt bei syrchei - nour byth bai sorochai

simonrl
51% (Neutral)
Administration

17 years ago

#3

I've seen the same effect in other places as well, so I think it's as much an effect of the harshness of LED light as the rock, although both seem to contribute to it.

Also used to get the effect, but even more pronounced, with my Light Canon, especially when the battery was failing, at which point it generated blue light 😮

my orders are to sit here and watch the world go by

mountainpenguin
50.2% (Neutral)
Newbie

17 years ago

#4

Led lights tend to have too much blue.
The luxeon rebel has a better colour rendition than the cree.
The cree is especially lacking in red light. You can, when buying an led spec the colour value.
acording to wikipedia white LED's are 'just' modified blue ones.

http://en.wikipedia.org/wiki/Light-emitting_diode#White_LEDs

LAP
50.2% (Neutral)
Newbie

17 years ago

#5

I think from now on I'm going to use a mix of LED and ordinary lighting to see what kind of colours are produced.

Kein geneis kanaf - Cain gnais canaf
Byt vndyd mwyhaf - byth onddyth moyav
Lliaws a bwyllaf - Líows o boylav
Ac a bryderaf - ac o boryddarav
Kyfarchaf y veird byt - covarcav yr vairth
Pryt nam dyweid - poryth na'm dowaith
Py gynheil y byt - Pa gonail y byth
Na syrch yn eissywyt - na soroc yn eishoyth
Neur byt bei syrchei - nour byth bai sorochai

simonrl
51% (Neutral)
Administration

17 years ago

#6

Here's a slate example lit solely by LED, showing a lot of blue.

🔗Cwmorthin-Slate-Quarry-02-08-2007-Image-010[linkphoto]Cwmorthin-Slate-Quarry-02-08-2007-Image-010[/linkphoto][/link]

my orders are to sit here and watch the world go by

LAP
50.2% (Neutral)
Newbie

17 years ago

#7

Nice pic
This is another "blue" pic taken entirely using my ordinary LED headlamp on an ISO of 800 (I didn't have a fenix at this time...)
[img]http://www.aditnow.co.uk/showimage?f=/community/Old-Man-Slate-Mine-User-Album-Image-155/[/img]

Kein geneis kanaf - Cain gnais canaf
Byt vndyd mwyhaf - byth onddyth moyav
Lliaws a bwyllaf - Líows o boylav
Ac a bryderaf - ac o boryddarav
Kyfarchaf y veird byt - covarcav yr vairth
Pryt nam dyweid - poryth na'm dowaith
Py gynheil y byt - Pa gonail y byth
Na syrch yn eissywyt - na soroc yn eishoyth
Neur byt bei syrchei - nour byth bai sorochai

thorpey
50.2% (Neutral)
Newbie

17 years ago

#8

using just a fenix on shade setting on fujis5700
🔗Abercwmeiddaw-Slate-Mine-User-Album-Image-034[linkphoto]Abercwmeiddaw-Slate-Mine-User-Album-Image-034[/linkphoto][/link]

didn't turn blue
Thorpey

Nut deep in water!

Manicminer
50.2% (Neutral)
Newbie

17 years ago

#9

I have found a mine that turns your photo blue.
Using a Fenix.

It looks like some sort of bacterial or fungal growth.[img]http://www.aditnow.co.uk/showimage/Ceunant-Hyll-Gold-Mine-User-Album-Image-001/?w=677[/img]

Gold is where you find it

stuey
50.2% (Neutral)
Newbie

17 years ago

#10

Internal refraction and re-emission of light from water droplets (no matter how small). I assume that if you set up the flash where it was and took it at an angle, you would get results biased towards the other end of the spectrum, depending on the size of the angle?

Just a thought.

Manicminer
50.2% (Neutral)
Newbie

17 years ago

#11

I did not use a flash. The pics were taken using a Fenix LED torch for lightpainting.
The mine was dry at this point. When at the mine you can see the growth. Where there's growth you get the blue tinge on the photos.

I bounced the light of the wall behind me with this one

I used a caplamp with this one, no blue light

Gold is where you find it

Mr Mike
50.2% (Neutral)
Newbie

17 years ago

#12

I have been taking more and more pics using LED lighting (my Retros'2) as the light source and some come out blue and some don't even on the same photo - It is to do with a number of things, some of the major ones that I think are part of it:

A lot of white leds are blue / UV, and this is converted into white light by shining onto a phosphor inside the LED. Some of this escapes and hence you get the blue effect, also you get fluorescence effects under these conditions. This tends to happen more with the cool white type.

The other thing is white balance on your camera. Try playing around with different settings for the light you are using, if it has custom, put a white sheet of paper in front of the camera and illuminate it with your light source, get the camera to save the reading and use it.

Mr Mike www.mineexplorer.org.uk

Manxman
50.2% (Neutral)
Newbie

17 years ago

#13

Now you're cooking with gas! If you get my meaning.....

JR
50.2% (Neutral)
Newbie

17 years ago

#14

Just a suggestion guys. When you set up for pics for the first shot put something white (in daylight) in the picture. Once you've taken that 'referance' shot procede as normal. If, when you load them into your pc to view them and the white reference object looks too blue you can adjust the colour balance in Photoshop, Gimp or what have you. Then you can either adjust all of that batch by the same amount or write a 'batch file' script to adjust them all by the same amount.

As I say, just a suggestion.

sleep is a caffeine deficiency.

Barney
50.2% (Neutral)
Newbie

17 years ago

#15

If you shoot in RAW you can alter the actual white balance on your PC, this can't be done in any photo editing software when shooting JPEG images