Cameras receive an enormous amount of visual information—far more than we need to reproduce a satisfactory image. Rather than store all that data, one way to reduce the burden is to throw away visual information our eyes wouldn't miss. As we have less accurate perception of color than brightness, it's standard practice to discard at least half the color information in every frame of video.
[Instructor] As mentioned earlier, our eyes are not…very good at accurately perceiving color.…In fact, they're so poor at seeing color relative to our…perception of luminance, that image technology manufacturers…have learned they can discard much of the color…information in an image, interpolate the remaining…color information, and we won't notice.…By the way, interpolate is just a long word…for averaging out.…Choosing not to record color information for particular…pixels in an image is called color spacing…or color sub sampling, and there are a few approaches to it.…
The principal is very simple and the results…can be impressive.…You can store less information making the file smaller…so you don't need as much storage space or bandwidth…to transmit the image, and the audience perceives…good quality, color rendition.…Color spacing is indicated using three numbers.…The first number is kind of the beats in the bar for music.…It tells you how the image has been divided up…for the purposes of color spacing.…A common option is four, so let's start with that.…
Get ready to remove the mystery behind terms you've encountered. If you work in a creative profession, this can enhance your command of the tools you use. Learn what a pixel really is, what color channels are, and what audio frequency is. Discover how color channels, bit depth, and video frame rates work. Find out the difference between codecs and file formats, and how compression is involved. By the end of this course, you'll know how to answer common client questions—like, whether a logo should be supplied in vector or bitmap form, and more.
Note: Motion graphics in this course were provided by Chelsea Parrish: chelseaparrish.com.
- What is a pixel?
- Aspect ratios
- Bit depth
- Alpha and transparency
- Light and color channels
- Color modes: RGB, YUV, CMYK
- Camera depth of field
- Chroma Key and Luma Key
- Blend modes
- Color wheels, vectorscopes, and waveforms
- Video compression and codecs
- Frame rates and timecode
- File formats
- Audio amplitude
- Capturing audio tone as frequency
- Audio timing using the phase
Skill Level Beginner
Learning Video Production and Editingwith Rob Garrott20m 37s Beginner
Video Foundations: Cameras and Shootingwith Anthony Q. Artis2h 58m Appropriate for all
Introduction to Video Dialogue Editingwith Ashley Kennedy3h 14m Appropriate for all
1. How Do Computers Think?
2. How Cameras and Computers Think about Color
3. The Language of Color
4. The Shape of Your Picture and the Speed of Your Video
5. Storing Everything (Codecs)
6. Color Wheels, Vectorscopes, and Waveforms
Understanding waveforms2m 39s
7. Making Changes
8. Audio Made Simple
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