While it's safe to describe brightness in terms of a percentage—which is applied regardless of the color mode or bit depth—doing so doesn't indicate how bright 100% is. Domestic displays have a reasonable level of brightness for home use—higher than your average cinema—but there's a new technology in town, and it stands to dramatically improve the viewing experience—high dynamic range. This video explains in simple terms what this new technology is.
- [Instructor] When we describe the brightness…of a pixel using bits,…perhaps using eight bits…to give us a scale from zero to 255,…we're not actually defining how bright 255 is.…It would perhaps make more sense…to describe this as a percentage,…where not percent bright is completely dark…and 100% bright is as bright as the pixel can go.…But this would only give us 100 steps from dark to light,…which we'd see in the image as banding or posterizing,…where there are subtle gradients like shadows on a wall.…
Having 255 steps gives us a more subtle transition…from dark to light, which is a good thing.…As mentioned in the lesson on bit depth,…the more bits you use to record a number…the bigger the range of numbers you can make.…However, no matter how big the number you use…to record the brightness of a pixel,…it will still only represent 100%.…In the case of a camera recording an image,…100% is the maximum brightness the light sensor can capture…without losing individual details.…
In the case of a display,…100% represents the maximum brightness it can produce.…
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 Garrott19m 25s 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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