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Author Topic : Gels..help.. 
 persistentvision



Thread Starter / Photographer
City: Luton
Country: United Kingdom
Member Since: Mar 13, 2006
Posts: 3641
Views : 2164  Jan 18, 2012 4:15pm

I'm a consistently rubbish studio photographer so bear with me - has anyone got a link or a pointer to using coloured gels to add colour to a background in shot?

I seem to struggle to do anything other than add a smeary colour cast when experimenting. I'm given to believe that keeping exposure low on the light with the gel gives a much deeper colour but after that I'm :looks blank: If anyone can help a clueless tosser out, I'd be super grateful,

Ian



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aviaandy

Photographer
City: Bridgend
Country: United Kingdom
Member Since: Jun 3, 2007
Posts: 1337
RE: Gels..help.. Jan 18, 2012 4:19pm

What colour is your background? If its white it won't work so well.


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RedChecker

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City: Stoke Mandeville
Country: United Kingdom
Member Since: Mar 9, 2008
Posts: 3034
RE: Gels..help.. Jan 18, 2012 4:21pm

Light the background normally (ie. on exposure), then use the gel of the correct colour and intensity you want.

If you're looking for that ultra-deep blue that people use a lot you're looking at getting a blue gel with a transmission factor of ~2-4%.



I bought all of Lee Filter's 'Magic' kits and spent an afternoon shooting a scene with each of the gels (~100 of them) and they sit in my Lightroom library for reference.

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barone

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City: Wolverhampton
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Member Since: Nov 25, 2007
Posts: 5041
RE: Gels..help.. Jan 18, 2012 4:23pm

Best background colour is anything from 18% grey to black...yes I said black.




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DaniRiot

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City: London
Country: United Kingdom
Member Since: Jul 16, 2007
Posts: 2295
RE: Gels..help.. Jan 18, 2012 4:33pm

when using gets with strobe lighting, what you see in your hand isn't what you get when you pass light through it.

This is due to the high speed nature of strobes.

You can either use the colour chart that lee provides. I have a massive poster with it on I got years ago when working in stage, but i'm sure its on their site too, which you can work out what the output is dependant on the power output and colour temp.

or...

the easiest way to get the colour you have in your hand to be the same as output is to layer them up. for every 100W's of output, you will need between 3-4 layers... It does mean you use more of the sheet, but they are not too expensive.

They will also last pretty much forever. I file mine away, and use i chinagraph pencil to write in the colour number in the corner of each cut, Chinagraph pencil will write on the gel perfectly, and also doesn't affect the colour output, even if you shoot through a written on section...

I would say to keep away from pre-cut effect packs. as for what you are paying, you don't get much product. Look up companies such as stage electrics, you can get 530mm X 1200m sheets for around £5 http://www.stage-electrics.co.uk/Category.aspx?id=21085



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 persistentvision



Thread Starter / Photographer
City: Luton
Country: United Kingdom
Member Since: Mar 13, 2006
Posts: 3641
RE: Gels..help.. Jan 18, 2012 4:36pm

Wow Guys, what a rapid response! Cheers - some good stuff to work at there - hadn't considered the background colour (on account of being STUPID) and the rest of the stuff sounds like it's worth close inspection.



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DaniRiot

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City: London
Country: United Kingdom
Member Since: Jul 16, 2007
Posts: 2295
RE: Gels..help.. Jan 18, 2012 4:45pm

This is the spectra curve info for each of the colours.

http://www.leefilters.com/images/pdf/Art_of_light_spectral_curves.pdf

I cant find the poster I have though, which was more detailed, shame they have stopped producing it.



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AndrewAppleton

Photographer
City: London And Lincoln
Country: United Kingdom
Member Since: Apr 27, 2006
Posts: 2522
RE: Gels..help.. Jan 18, 2012 5:12pm

The other thing to bear in mind is you don't necessarily need to aim the gels at the background. In this shot of Iveta, taken on one of my lighting workshops, there are two lights with barn doors and blue gels aimed from the rear towards her. This gives a blue rim light to her body plus areas that fall out of the zone lit by the non gelled key - a beauty dish on a boom, take on a blue hue as well.

The random lines on the backdrop, which is white vinyl, are caused by the barn doors.



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switchphotography

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City: Arundel, West Sussex
Country: United Kingdom
Member Since: Oct 26, 2005
Posts: 3607
RE: Gels..help.. Jan 18, 2012 5:14pm

GROUNDHOG DAY!

[edit - damn, he deleted the other three... ]

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 Myk



Photographer
City: Pant
Country: United Kingdom
Member Since: Jan 12, 2003
Posts: 1225
RE: Gels..help.. Jan 18, 2012 5:14pm

That PDF is an absolute must for me - thank you !

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Gosh

Photographer
City: Weston Super Mare
Country: United Kingdom
Member Since: May 20, 2008
Posts: 281
RE: Gels..help.. Jan 18, 2012 5:46pm

I use a light to mid brown paper when im using gels, it accepts the colour really well and looks neither washed out or 80's style overkill.

The trick is to fire the head across or to the side of the paper so that your using the edge of the light to create the colour rather than the centre of it, that way everything is lit evenly.

Link: Studio for hire, Weston super mare, Model days etc
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 persistentvision



Thread Starter / Photographer
City: Luton
Country: United Kingdom
Member Since: Mar 13, 2006
Posts: 3641
RE: Gels..help.. Jan 19, 2012 4:04am

fabulous stuff I shall have to go off and experiment a bit now I have some ideas to work with.

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barone

Photographer
City: Wolverhampton
Country: United Kingdom
Member Since: Nov 25, 2007
Posts: 5041
RE: Gels..help.. Jan 19, 2012 5:12am

Even some pictures....




Link: How to.....
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 persistentvision



Thread Starter / Photographer
City: Luton
Country: United Kingdom
Member Since: Mar 13, 2006
Posts: 3641
RE: Gels..help.. Jan 19, 2012 8:46am

quoting post from barone:

Even some pictures....




Genius...that's right at my level of "ugh...Ian..take picture.."



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