Image Processing & Enhancement Flashcards
7 cards from real DIS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Image Processing & Enhancement flashcards as text
Which color adjustment tool in image editing maps specific input tonal values to desired output values using a custom curve?
Answer: Curves
The Curves tool allows precise mapping of input tonal values to output values across the full tonal range, offering fine control over contrast and color.
In image processing, morphological dilation of a binary image will:
Answer: Expand foreground objects by adding pixels at boundaries
Dilation adds pixels to the boundaries of foreground objects using a structuring element, expanding their size and filling small gaps.
What does the 'Threshold' slider in an unsharp mask filter do?
Answer: Defines how different a pixel must be from its surroundings before sharpening is applied
The threshold value prevents sharpening of pixels whose tonal difference from neighbors is smaller than the specified value, protecting smooth areas like skin from over-sharpening.
Which demosaicing algorithm produces the highest quality output from a Bayer pattern RAW file but requires the most processing time?
Answer: AHD (Adaptive Homogeneity-Directed) demosaicing
AHD demosaicing adaptively selects the best interpolation direction for each pixel, producing superior edge detail and color accuracy at the cost of higher computational demand.
A 'luminosity mask' in advanced compositing selects pixels based on:
Answer: Their brightness values relative to the tonal range
Luminosity masks create selections weighted by pixel brightness, allowing edits to be applied with natural feathering that respects the tonal values in the image.
What is the primary advantage of performing noise reduction before sharpening in a processing workflow?
Answer: Sharpening amplifies noise, so reducing noise first prevents artifacts from being enhanced
Sharpening increases local contrast including noise, so removing noise first ensures only genuine detail edges are enhanced rather than amplifying random artifacts.
In Lab color mode, lightness adjustments made to the L channel do NOT affect:
Answer: Color saturation and hue
In Lab color space, the L channel is completely separate from the a* and b* color channels, so luminosity adjustments leave saturation and hue unaffected.