Channels & Masks in Photoshop
Terms
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- What is a channel?
- A component of an image where information about color is stored.
- What is an Alpha channel?
- A special 8-bit grayscale channel that stores information about masks/selections.
- What is an 8-bit pixel?
- A pixel that has 8 bits of data assigned to it.
- How does Photoshop store a full-color image?
- In channels of 8-bit pixels. 8 bits of data are assigned to each pixel so there are 256 brightness values from black to white in each color channel.
- Name the channels in an RGB file.
- Red, green, blue.
- Name the channels in a CMYK file.
- Cyan, magenta, yellow, and black. Each color represents a process-color printing ink.
- What is bit depth?
- The number of bits used to store a pixel's color information for display.
- How many colors does an 8-bit image display?
- 256
- How many colors does a 1-bit image display?
- One (also called monochrome)
- What is a mask in Photoshop?
- A selection that isolates one area of the image from being changed while you changing another area. Anything outside the mask is protected from changes.
- What is RGB and where does it come from?
- Red, Green, Blue - the three colors of light that create all other colors on a computer screen.