Abstract
Statement of problem
How the color parameters obtained from digital photographs may be influenced by illumination,
file format, and subject color is unclear.
Purpose
The purpose of this in vitro study was to evaluate color differences (ΔE00) and CIELab color coordinates among different types of file formats of dental shade
tab images with and without white balance.
Material and methods
Different shade tab colors (n=10) were photographed with a digital camera under standard
conditions. The photographs were stored in RAW, JPEG, and TIFF file formats and evaluated
with and without white balance (WB) adjustment by using an image software program
and a gray reference card with known color coordinates. CIEDE2000 color differences
between each image file format and the control group (RAW WB) were calculated, and
interpreted by the visual perceptibility (PT00=0.8) and acceptability (AT00=1.8) thresholds. The ΔE00 color shift was defined according to CIEDE2000 lightness, chroma, and hue and interpreted
by the following respective visual acceptability thresholds: 2.92, 2.52, and 1.90.
The differences among the color coordinates were analyzed by Kruskal-Wallis and Bonferroni
post hoc tests (α=.05).
Results
The color coordinates presented statistically significant differences between the
file formats and control group (P<.001). Excellent matches (ΔE00 ≤0.8) were observed on TIFF and JPEG saved from RAW-WB. Images without WB presented
unacceptable mismatches (ΔE00 >5.4). ΔE00 color shift of images without WB were predominantly influenced by ΔH00, while JPEG, WB, and TIFF WB were mostly influenced by ΔC00.
Conclusions
Only compressed JPEG or TIFF files of dental shade tabs derived from original RAW
WB photographs were able to achieve color differences within the limits of the 50:50%
perceptibility threshold, providing excellent color matches with the RAW WB files.
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Article info
Publication history
Published online: May 12, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: Supported by the Brazilian Ministry of Education (Foundation for Post-Graduate Education-CAPES) [grant 88882.428245/2019-01].
Identification
Copyright
© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
