46. Video Review : Color Correction Laboratory: Rosco CTO vs CTS


I accidentally clicked on this video and i was surprised how diligently and simply Shane Hurlburt explains the light filters to us. Frankly i don't know anything about lighting and this is one aspect of film making, another is sound, on which my knowledge is bleak. Shane is not just any youtube, he is a great cameraman who has done several mainstream films in Hollywood like Terminator Salvation, Need for Speed  and many more. I wanted to learn about lighting because i am planning to make my own ad films soon and this video so much helped me in understanding the things i never thought i would ever understand.

Why this video is important?
This video is important because it tells you about the difference between CTO and CTS. For those who don't know what is CTO and CTS and really want to know, then here is a brief description between the two. I don't know who wrote this but i am mentioning it here for your benefit. I lifted it from a forum and god bless the soul who explained it so nicely.

The most common gels used on a production are the blues and oranges to either warm up or cool off the color temperature of a lamp. Full CTB (Color Temperature Blue) is a fairly deep blue that will correct a 3200K tungsten lamp to daylight color temp (although you will lose two stops of output in the process.) Conversely, Full CTO (Color Temperature Orange) is a strong orange that will correct a 5500K daylight lamp like an HMI to 3200K balance to match a tungsten lamp, more or less.Of course, these gels could also be used for an orange or blue effect as well.And they make 1/8, 1/4, 1/2 and sometimes 3/4 strengths of CTO or CTB for partial correction, subtle warming or cooling of the color. For example, people often use 1/4 CTO on a lamp to warm up for a night interior scene that should look slightly golden and cosy. They may use 1/2 CTO for a late afternoon effect and Full CTO for a orange firelight effect or a sunset effect.Some people now use CTS (Color Temperature Straw) instead of CTO -- the amount of correction of color temp is the same for the series, it's just that Straw has more Yellow than Red in their shade of Orange. 

 In this video, the best part is that they have invested lots of time and money to actually show the difference between what happens when you use filters, how they affect the f-stops and how much lighting needs to be changed. It also helped me in understanding the change in color backgrounds and foregrounds that we witness in lots of recent british and netflic serials.

A must watch for every independent film maker in my opinion. I am going to use this knowledge in my future projects.

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