Digital Imaging Flashcards
Pixels have three properties, what are they?
1) Size
2) Location
3) color value
The number of pixels directly affects the quality of the image
What color mode do our cameras (digital) capture in?
RGB (red / green /blue)
(They make white)
Selected channel will lighten its own color while darkening the other two)
What does the sensor in the digital camera measure?
The reflection of light
What is the goal of contrast in photoshop digital enhancing?
The goal is to separate the impression detail from the background by increasing the contrast
What are the two types of imaging?
RASTER- (pixel based)
VECTOR- you will never see pixels (paths and curves)
What are sensors?
Matrix of millions of microscopic light sensitive photodiodes
These create pixels by sensing the light intensity of small portions of the image
Can only record greyscale
What are the two types of compression schemes? L’s
Lossy ( JPEG)
Lossless (tiff, raw)
Resizing vs resampling
Resizing does not change the original size, the number of pixels stays the same and original image doesn’t change. Pixels get larger or smaller
Resamoling adjusts the total number of pixels in the image. Will result in a lower quality image.. usually not noticed.
What is calibration?
Resizing and image so that it fits an actual real life scale
Calibrated images can be printed to life size or to scale.
Always have resample off
Digital enhancement workflow steps. The chart where you start with the original image and calibrate.
Original image
Calibrate
Color/channels
Greyscale (invert)
Levels
Sharpening
What are the two color modes : RGB and CMYK
Cyan, magenta, yellow, key (black)
(Mixing all makes black) selected channel will darken its own color and lighten the the others.
What bit depth provides continuous tone?
8 bit
