DIS Cheat Sheet 2026

The 30 highest-yield DIS facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. In a color-managed workflow, what is the purpose of assigning a source profile vs. converting to a destination profile? → Assigning reinterprets the existing numbers; converting recalculates them for a new space
2. Which sensor characteristic is most directly responsible for the appearance of color fringing (purple or green) along high-contrast edges? → Chromatic aberration and lateral CA in the lens
3. Why is data visualization important in DIS reporting? → It makes complex patterns easier to understand and communicate
4. What is the benefit of using file versioning? → Keeps multiple copies for safety and rollback
5. In offset lithography, what is the primary function of the blanket cylinder? → Transferring the inked image from the plate cylinder to the substrate
6. An imaging center's risk assessment identifies that its PACS vendor no longer provides security updates. This is BEST described as: → End-of-life (EOL) software risk
7. Which color space is most appropriate as an interchange format between different imaging devices in a cross-platform digital imaging system? → sRGB
8. When an imaging AI workload requires GPUs in the cloud, which instance category should a DIS professional select? → GPU-accelerated compute instances
9. Under HIPAA, how must digital medical images be protected when transmitted over a network? → They must be encrypted using a compliant encryption standard
10. What statistical measure best describes the spread of pixel intensity values in an image? → Standard deviation
11. An imaging facility wants to ensure that only authenticated NTP servers synchronize time on DICOM devices. Which protocol version addresses this? → NTPv4 with symmetric key or autokey authentication
12. Which Delta-E formula is considered the most perceptually uniform and is preferred for evaluating color accuracy in modern profiling? → Delta-E 2000 (CIEDE2000)
13. Which network architecture element reduces latency for globally distributed imaging clients retrieving the same radiographic files? → Content Delivery Network (CDN)
14. A cloud imaging system's SLA guarantees 99.9% availability. Approximately how much downtime per month is permissible? → About 43 minutes
15. Why is regular backup important in file management? → To safeguard against data loss
16. What is 'overprinting' in prepress, as opposed to a knockout? → Printing one ink layer directly on top of another without removing the underlying color
17. What does a color gamut represent? → The complete range of colors a device can show
18. What differentiates quantitative from qualitative data in DIS? → Quantitative is numerical; qualitative is descriptive and categorical
19. Which standard defines the use of XMP (Extensible Metadata Platform) in digital imaging? → Adobe XMP Specification (ISO 16684)
20. Which metering mode evaluates light from the entire scene and averages it, giving extra weight to the area near the focus point? → Matrix/evaluative metering
21. What is dynamic range in image capture? → The ability to capture both light and dark details in one image
22. Which SDLC approach delivers a minimal working product early and incrementally adds features based on user feedback? → Iterative and Incremental
23. A DBA wants to enforce that every image record must have a non-null file_path. Which constraint type should be applied? → NOT NULL constraint
24. Why is regular review important in DIS risk management? → Conditions change and new risks emerge requiring updates
25. What is the primary function of a LUT (Look-Up Table) in a digital imaging workflow? → To map input color or tonal values to output values, enabling fast color transformations
26. A digital imaging analyst calculates the ΔE2000 between a target color and a captured color as 1.2. How should this result be interpreted? → The color difference is just noticeable under critical viewing
27. Which workflow step ensures that a digital file's color will be correctly interpreted by every application in the production chain? → Embedding an ICC profile in the file
28. A photographer shoots indoors under fluorescent lighting without adjusting white balance. The images will most likely have a dominant color cast of: → Green-yellow
29. Which environment in a typical deployment pipeline is used for final validation by business stakeholders before production release? → Staging / UAT
30. Which file format supports both lossy and lossless compression, wide color gamuts, HDR, and transparency? → JPEG XL