week 12 Flashcards
(15 cards)
What are photosensitive cells coated in?
Red, green, or blue filters that make them sensitive to 1/3 of the spectrum
What can photosensitive cells read?
Read the amount of light that comes in contact with them by turning them into electrical charges
How are scanners set up to capture information?
Photosensitive cells are lined up in a long row across the scanning bed that travels over the sample image
True or false, scanners have their own internal light source
True
How are digital cameras set up to capture information?
Photosensitive cells are arranged in some type of array to capture an area all at once
How do digital cameras capture light?
Focus on the image through optics onto the photosensitive array
What is the most common pattern array for red, green, and blue in camera sensors?
The Bayer pattern
What are the percentages for red, green, and blue in the Bayer pattern?
25% red, 25% blue, 50% green
What aspects does the software designed for rendering images from a scanner focus on?
Highlight/ shadow points, tone reproduction, colour bias
What is the RGB from a digital cameras designed for?
To give the customer pleasing images
Which RGB data is better for colour management? Camera RGB or scanner RGB?
Scanner RGB, camera RGB is not colour accurate
What are the consistency/ optimization points for a scanner?
Should be optimized to the same highlights, shadows and midtones for each scan
What are the consistency/ optimization points for a digital camera?
The lighting must remain consistent for accurate colour management and exposure should stay optimized for each shot
What are the calibration settings for a scanner?
Most are self calibrating to the internal light source and black points
What are the calibration settings for a digital camera?
Need to calibrate the measurement device to some kind of known point (whitepoint) and set exposure to optimal setting
