Effect of camera distance and angle on color of diverse skin tone‐based standards in smartphone photos

Abstract

Accurate and reproducible color capture is vital in medical photography. Camera distance and angle are particularly important as they are highly variable in a clinical setting. To account for variability in illumination, camera technology, and geometric effects, color standards are often used for color correction. To explore how geometry affects color, we quantified the change in CIELAB color value of a color standard for diverse skin tones at varying smartphone camera distances and angles. Whereas both chromaticity (a* and b*) and lightness (L*) were affected by angle, distance only affected L* (standard error of measurement, SEM > 1 CIELAB unit). Flash usage did not generally reduce distance and angle associated variability. Compared to compressed (JPG) format, raw (DNG) images had decreased median variability across different distances and angles. These findings suggest that in medical photography, inconsistent camera distance and angle can increase variability in photographed skin appearance over time.

Advancing Dermatological Care: A Comprehensive Narrative Review of Tele-Dermatology and mHealth for Bridging Gaps and Expanding Opportunities beyond the COVID-19 Pandemic

“…Nine reviews [22][23][24][25][28][29][30]36,38] and one systematic review [32]; • Twenty-five papers [21,26,27,31,[33][34][35][40][41][42][43][44][45]48,[50][51][52][53][54][55][56][57][58][59][60].…”

“…The search provided 40 components [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ] in the three years since the COVID-19 pandemic outbreak (at the date of this study).…”

“…In detail, the components were: Two randomized controlled (clinical) trials (RCTs) [ 37 , 49 ]; Three observational studies (OS)s [ 39 , 46 , 47 ]; Nine reviews [ 22 , 23 , 24 , 25 , 28 , 29 , 30 , 36 , 38 ] and one systematic review [ 32 ]; Twenty-five papers [ 21 , 26 , 27 , 31 , 33 , 34 , 35 , 40 , 41 , 42 , 43 , 44 , 45 , 48 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ]. …”

“…Twenty-five papers [ 21 , 26 , 27 , 31 , 33 , 34 , 35 , 40 , 41 , 42 , 43 , 44 , 45 , 48 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ].…”

“…Generally, all the studies converged on the opportunities and general perspectives regarding TD in mHealth and its role in improving the quality of service overall [ 21 , 26 , 27 , 31 , 33 , 34 , 35 , 40 , 41 , 42 , 43 , 44 , 45 , 48 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ]. The evidence showed that TD and mHealth could improve the quality of care, the healthcare process, the cost savings, the stress in healthcare facilities, and citizens’ satisfaction.…”