Artifact-free countershading
The images below were generated using the artifact-free unsharp
masking method (section 6.1), and adjusted to the just-objectionable
countershading thresholds found in our experiments.
The optimum optical resolution for this page is 30 pixels per
visual degree, which corresponds to viewing a 24" 1920x1024 display
from the distance of 18.5" (47 cm).
The σ-values below each image corresponds to the width of the
countershading profile and λ-values to its magnitude. Move the
mouse over any of the images to see the original image without
countershading enhancement.
σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
| σ = 0.133 [vis deg] (= 4 px); λ = 0.333
| σ = 0.329 [vis deg] (= 9.86 px); λ = 0.466
| σ = 0.811 [vis deg] (= 24.3 px); λ = 0.638
| σ = 2 [vis deg] (= 60 px); λ = 0.76
|