Saturday 14 April 2012

VFX Worf flow - colour correction

Hello guys ,
I am back with another important concept of the vfx work flow .
That is "Colour Correction " .Also called as color grading .
Color grading , is the process of altering and enhancing the color of a motion picture, video image, or still image either electronically, photo-chemically or digitally. The photo-chemical process is also referred to as color timing and is typically performed at a photographic laboratory. Modern color correction is digital color correction .
To underastand color correction easily ,i will give you a simple example .In lots of movies we might have seen many night effects shots .Actually the majority night effects are computer generated colour corrections .They were shot in day time .later the vfx team will change the colors .observe the following picture .

day to night conversion image :





In compositing work flow ,color correction takes major part. why because ,After compositing blue matte or roto extracted parts with some different back grounds,it looks artificial due to color grade differnece between each layer (image/ video) .To OVERCOME THIS PROBLEM VFX ARTIST should have to color correct the foreground and background images to get realistic output .see the following images .

color correcting the composited image :


To become a good color grading artist ,you should be familiar with color theory .i will explain color theory briefly .
the color wheel ;




The color wheel or color circle is the basic tool for combining colors. The first circular color diagram was designed by Sir Isaac Newton in 1666.
The color wheel is designed so that virtually any colors you pick from it will look good together. Over the years, many variations of the basic design have been made, but the most common version is a wheel of 12 colors based on the RYB (or artistic) color model.
Traditionally, there are a number of color combinations that are considered especially pleasing. These are called color harmonies or color chords and they consist of two or more colors with a fixed relation in the color wheel.
ColorImpact is designed to dynamically create a color wheel to match your base color.
Primary, Secondary and Tertiary Colors
In the RYB (or subtractive) color model, the primary colors are red, yellow and blue.
The three secondary colors (green, orange and purple) are created by mixing two primary colors.
Another six tertiary colors are created by mixing primary and secondary colors.

COLOUR CORRECTION TUTORIALS COMING SOON

1 comment:

  1. Thanks for sharing this information and beautiful picture.. They are really stunning... You did a great job.
    colour correction in GroupDMT

    ReplyDelete