Gels, Filters and Good Color?



Stephen Eastwood|Beauty and Fashion Photographer | Tutorials

Gels, Filters and Good
Color?

 

Q. Gels and filters.   I spend a lot of time trying to get
the colors I want, haven’t found any great advice yet.   One effect
I like is the vibrant, saturated, technicolor look.    I’ve had trouble
doing this in digital without the aid of Photoshop, as it is easy to blow out
color channels. (have had better success with slide film, where colors blow
out a bit more gracefully).  What am I missing?

I also end up wanting to change the color temperature on certain areas of a
subject (warmer light on the face, cooler light elsewhere, etc).  My results
have been poor to date….  What gels do you find most useful, and used
how?

OK, first this is subject to the camera and in camera adjustability and that
goes into a what camera do you have question?  I know that most all now
have settings for saturation, contrast and tone.  That’s one thing, many
also have some custom settings that simulate the various looks of certain filmstocks,
within limitations.  No one has made a great in camera simulation of a
filmstock yet, though several after market companies have done some great ones,
like alienskin and exposure which is a very decent plugin if you were ever to
get one (I personally never use any plug ins for any post work)  But that
may well be worth a look.  However if that were useful so would making
your own action in Photoshop, and it seems you are attempting to get it right
in camera perhaps on a jpg file (I won’t start on the benefits of raw wink
) so back to your what do you do?  well canon now offers a way to edit
picture styles what this allows you to do is take an image in raw and adjust
the colors in several modes Color, LAB, and tweak away till your hearts content
in creating a perfect picture style for you and use that as the default for
your jpgs and conversions but it only works on converting raws in DPP, if you
were converting raws in acr you could make a custom profile for specific styles
there as well, but again this would be an after the fact process. 

So what type of setting are best for your style?  well saturated color
will go along with a boost in contrast and a deepening of colors which comes
from a slight underexposure to maximize the saturation.  On a digital camera
the basics of upping saturation is a good start, but rarely is high ever useful
for people, same goes for contrast, but that tends to speed up the blown out
color channels, so the ideal would be the use of a polarizer and or enhancing
filter, both will reduce the light entering the camera and make it harder to
see and focus through the viewfinder in dim conditions.  But this will
get your colors pumped a bit.  Avoid the warm versions as they are helpful
in adding warmth at the cost of more light and since your digital you can adjust
your WB for the added warmth instead with no sacrifice of light intensity in
the process. 

I also end up wanting to change the color temperature on certain areas
of a subject (warmer light on the face, cooler light elsewhere, etc). 
My results have been poor to date….  What gels do you find most useful,
and used how?

I do this often, in fact I would say that I almost always have at least one
gel if not more working on a shoot.  In the old days of astia I used a
tea cloth on my mains always, and have since replaced it a digital variation
that works afterwards in post.  But I still like the images to vary in
temp all over and have found the best most consistent way for that to be done
it first a reversal of the light temp of the main to eliminate any strange cast
the modifier may have present.  Huh?  OK, I am getting to it, I am
not now nor have I ever been a fan of accurate color!  I think most beauty
models have been selected to have a skin tone and color that would most annoy
me, and yes, I know that sounds a bit paranoid on my part, but I have it on
good authority that, that is precisely the method most agencies judge beauty
models by when recruiting new ones!  They know I like a challenge and get
bored when everything is too easy, so they do what they can to help wink 

Now back to what I do, I know my units and softboxes and dishes and what have
you, but not anyone else so I am never trusting that any of it does not have
some color that I just don’t like in it, so I want to use a gray card, not a
18% card designed for exposure but one that is designed for digital WB adjustment
and is very likely neutral.  I use a WhiBal as they are all hand checked,
and I know the owner and creator, very nice guy, very intent on having a great
product!  They all have a reading of exactly the specs of the neutrality
and its within a tolerance that if I could ever see I would be like superman
with x-ray vision and have better things to spend my time looking at daily. 
So I use that for a reference (OK I only shoot raw and am now often too lazy
to really set the custom WB, I go by temp scale usually, but this gives me a
good one if I need it, so do what I say not what I do, until you fully know
what you do, and can do what you want wink
)  So what do (or did, or should) I do?  I said I don’t like it neutral,
so why would I want it that way?  I don’t, I want to get rid of any color
cast, so if the softbox or umbrella has a yellow /green tint to it, I want to
eliminate that for neutral, but I want a warmer picture and warmcards work great
for video, they seemingly not so great for me in stills.  So instead I
take a wratten filter, you can use a screw on filter or a piece of gel, (in
fact if you can get a book or the samples of cinefoil or rosco gels it has them
all just get the large 4×5 size book of samples wink
) I take the wrattan or filter or gel which is 100-400 degrees cooler than the
light I want.  Why cooler?  because I place that in front of my camera
and I shoot a neutral gray card, and balance for the neutrality of that, in
other words set the custom WB on that image, and than (this is important) take
off the wrattan or filter or gel that was in front of your lens. What this does
is gives you a colorcast free light that now has the color cast you want, I
took out the yellow/green from the softbox but added the – 200 or 300 degrees
and when I balance for that my camera now thinks that’s accurate, when I remove
the gel and shoot with that WB all casts are removed but I am several hundred
degrees warm, and the shot of the models face is not several hundred degrees
warm as well.  This also works if your light and modifier is right but
say your in a bedroom and the walls are reflecting a strange burgundy hue that
is throwing off the color, you will this was eliminate the burgundy hue and
still maintain a warm temperature. 

OK, before you ask why don’t you just shoot the gray card and put a warming
filter on if you want it war, its because I see no reason to 1) cut the light
down through the viewfinder, and 2) place a cheap wratten that is now old and
worn or even an expensive filter in front of a lens that had millions of dollars
of research and development to make, with as few pieces of glass as possible. 
wink

So now what did this do? it gave you a nice balance of neutral colorcast and
warm tones, of course you can use the same concept to do other effects, on a
shoot where we needed a green fluorescent lighting effect to simulate the green
look, and we only had daylight balanced kinos lighting the scene, I balanced
on a whibal with a magenta .30 on the lens and removed the magenta giving a
green tint to the scenes and making my daylight balanced tubes look like the
old cheap florescent lights, funny how that happens. 

What other gels do I use?  On lights I use a lot of different ones. 
The main are 1/8, 1/4, 1/2, full cto* and 1/8, 1/4, 1/2, full ctb*, straw, 1/2
straw, bastard amber, 1/8, 1/2 magenta, 1/8, 1/2 green, pale rose, light rose,
middle rose,  cosmetic silver rose, rose tint, peacock, red, orange, yellow,
blue, green, chocolate, and the whole range of ND gels, etc. 

You name it I have used it including older gels that turn a strobe source into
a blacklight at the expense of so much light it makes my broncolors into vivitars
wink  Works
though.

Now the ones I find most useful, 1/4 and 1/2 cto, I almost always have them
on hair lights, and most rim lights.  1/4 and 1/2 ctb I often will have
on background lights to offset the warmth I add through WB control.  I
always did use tea cloths made from Lipton tea for mains but have since created
a custom curve for Photoshop that has recreated it, it is perfection and is
repeatable and easier to use selectively. 

Another popular thing I do now and especially in the past when shooting more
sexy beach glamour for the Maxim/FHM,/Loaded type was we would always have a
1/2 to full ctb on the main strobes and balance either film or now balance for
that and shoot, this allowed the subject to be shot with a WB that was adjusted
for accurate (or warm in based on my reverse settings) but set with a very cold/blue
light source, which allows the rest of the environment, mainly the sunset, sky,
beach to go very warm in comparison.  And if we were not doing a sunset
and wanted a deeper blue sky, or a bluer ocean, we would do a reverse process
using 1/2 to full cto on the mains adjusting for that and shooting which made
the sky/ocean go very cool and blue. 

With film in bright daylight we did use to use both daylight and tungsten with
the same effects and beside the normal C.P. and ND we would simply correct out
the added shift with on camera filters.  Its much easier now with digital. 
But using tungsten film and shooting a day lit scene midday with a 1/4 or 1/2
warming filter on camera gave us a bluer sky and with strobes we adjusted to
get the light 1/4 warmer than the filmstock which was tungsten plus the filter
strength.

Another popular use of filters is creating day into evening, ctb plus a 1/4
magenta would given an underexposed ambient scene a moonlit nightime look often
associated with the night scenes in film (you know the motion picture kind)

To enhance fires in a scene such as where a fireplace is lit but the typical
flames are not fully glowing red on film based on the exposure settings, so
using a tight grid or snoot shooting a full cto or even a piece that is orange/red
striped into the fireplace creates a very warm glow that can be controlled without
the need to slow down to unreasonable levels. 

And a major use on indoor hotel/restaurants and location shoots is to wrap a
piece of cto on little strobes (often lumedyne heads given their tiny size at
a base of 400ws) that were placed into light fixtures like lamps sconces etc
on locations.  This works just as well on little vivitars or any small
slave and in lamps many have used the screw in slaves, which work well but tend
to recycle very slow.  What this does is it allows you to light a room
with strobes and shoot at whatever given settings you choose, and still maintain
a full ambiance as if the lamps were emitting a warm tungsten glow even though
the lights  are actually daylight balanced strobes like the mains. 
It eliminates the need to slow down or use a higher iso to get them to register
brightly and add dimension and character to a scene.     

And when shooting indoors with strobe and wanting the appearance of a bright
sunny or harsh daylight to be streaming in the window, we would simply adjust
the inside for the temperature we liked with the strobes and blast  bright
lights streaming in the windows with either cto, typical daylight effect, bastard
amber for a more sunset look and feel, 1/2 ctb for a more harsh cold daylight
effect and 1/2 cto and 1/2 straw tends to register as a more early morning sun. 


*

cto   – color temperature orange which converts daylight to tungsten,

depending on brand full cto will typically bring 5500 kelvin to either 2900
kelvin or 3200 kelvin

1/2 cto will typically bring 5500 kelvin to 4500 kelvin.

ctb    -color temperature blue which converts tungsten to daylight,

depending on the brand full ctb will typically bring 3200 kelvin to 5500 kelvin.


1/2 ctb will typically bring 3200 kelvin  to 4100 kelvin

here is a chart of many common conversion of color temperature and some 
lens filters you may use

http://stepheneastwood.com/tutorials/images/colorfilterconversions.jpg

 

 

 

©Stephen Eastwood 2008 www.StephenEastwood.com
www.StephenEastwood.com/bio
www.StephenEastwood.com/tutorials


About photographers1

Stephen Eastwood Fashion and Beauty Photographer and Retoucher based in NY/LA/Ft. Worth TX http://www.StephenEastwood.com Current Canon Explorer of Light.
This entry was posted in All Posts, Tutorials and tagged , , , , , , , , , , , , , , . Bookmark the permalink.

10 Responses to Gels, Filters and Good Color?

  1. Pingback: Stephen Eastwood | Photography » Accurate and Good Colors and Skin Tones

  2. Tom says:

    Why not just dial in a white balance shift in the camera settings? For example Amber +7 Magenta +3 works nice for warming portraits (these values were actually recommended by David Zeiser on Kelbytraining). From a quick test i did they are respected by Lightroom on top of the WB presets for RAW files. My feeling is that the color balance sliders in ACR (and also the levels of the a and b channels in LAB) represent a different color space than the Amber-Magenta axis. Especially Amber is useful – it gives the skin a very nice warm tone.

  3. Tom says:

    so the Blue-Amber axis can be used instead of the Wratten filters. after a bit of research on the internet here is what i found:

    81A (+18 mireds) = Amber +4
    81B (+27 mireds) = Amber +5-6
    81C (+35 mireds) = Amber +7
    81D (+42 mireds) = Amber +8-9

    82A (-21 mireds) = Blue -4
    82B (-32 mireds) = Blue -6-7
    82C (-45 mireds) = Blue -9

    Stephen, i really like your trick with balancing for a gelled main strobe to color-shift the ambient. Will have to try it!

  4. Kevin Allen says:

    My cousin recommended this blog and she was totally right keep up the fantastic work!

  5. I’ve already bookmark this article and will definitely refer this article to all my close friends and colleagues. Thanks for posting!

  6. Banoattadly says:

    Just want to say what a great blog you got here!
    I’ve been around for quite a lot of time, but finally decided to show my appreciation of your work!

    Thumbs up, and keep it going!

    Cheers
    Christian,

  7. WP Themes says:

    Nice brief and this fill someone in on helped me alot in my college assignement. Thank you for your information.

  8. Hi there, anyway, thanks for the info!

  9. IP Camera says:

    Hi Guy, this good blogs, thanks

  10. Paul says:

    Excellent and what a great blog! I’ve become a big fan of your work Stephen keep up the good work!