Quantifying light harshness: method automation and influence of photographic light modifiers

Štampfl, Veronika (avtor), Ahtik, Jure (avtor)

Accurate assessment of light properties is essential and is measured with photometric and colorimetric standardized methods. However, the spatial characteristic of light-harshness-remains difficult to quantify. Building on the authors’ previous work, this study presented a fully automated method for determining light source harshness based on image analysis of cast shadows in a standardized environment. The improved method eliminated the need for manual shadow segmentation by introducing algorithmic noise removal and adaptive smoothing of shadow data. The method was applied to 180 test images comprising 30 combinations of photographic light-shaping attachments (e.g., softboxes, beauty dishes, and snoots) across two light sources (halogen and xenon) and three intensity levels. The results showed that the method was capable of detecting subtle differences in shadow properties and confirmed the influence of geometry, material, and orientation of the light modifiers on harshness. In addition, the results provided quantitative insight into the influence of photographic light modifiers on the original light.

• Jezik: Angleški jezik
• Ključne besede: light harshness, shadow analysis, image processing, lighting evaluation, photographic modifiers
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: NTF - Naravoslovnotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: 17 str.
• Številčenje: Vol. 12, iss. 4, art. 148
• PID: 20.500.12556/RUL-181714
• UDK: 655
• ISSN pri članku: 2313-433X
• DOI: 10.3390/jimaging12040148
• COBISS.SI-ID: 273760515
• Datum objave v RUL: 14.04.2026

Gradivo je del revije

• Naslov: Journal of imaging
• Skrajšan naslov: J. imaging
• Založnik: MDPI AG
• ISSN: 2313-433X
• COBISS.SI-ID: 525653017

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: trdota svetlobe, analiza senc, obdelava slik, vrednotenje svetlobe, oblikovanje svetlobe

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0450-2024
• Naslov: Inovativna grafična tehnologija