Table of Contents
Shadows: Rule 5 - The Contrast Wall
This is a visibility rule … “If a shadow isn't seen … there is a contrast wall!”
In the Android rendering engine, shadows are not solid objects; but instead are mathematical blurs applied to the background. For a shadow to be visible, there must be a significant difference in brightness (Value) between the shadow and the wallpaper.
The Luminance Floor
The “eye” recognizes brightness as the subjective value of a measure of luminance. On dark backgrounds (a luminance value < 20%, such as OLED black), low-alpha shadows effectively “sink” into the darkness and disappear. The “eye” does not register them.
- The Problem: When a light color is spread over a large radius, the “Luminance Density” drops. A 20% white shadow spread over a 50px radius becomes so thin it is invisible to the human eye.
- The Solution: To stay visible on dark themes, use a Higher Alpha (80%+) or Solid Colors.
Alpha Visualized
Shown here are reference characters of the Alpha's for “AA”RRGGBB:
| Alpha cheat sheet (most useful values) |
||
|---|---|---|
| Color Picker Hex: FB00FA37  |
||
| Alpha | Transparency | Glass Effect |
| FF | 100% opaque | Solid |
| E6 | 90% | |
| CC | 80% | Almost solid |
| B3 | 70% | |
| 99 | 60% | |
| 80 | 50% | Heavy glass |
| 66 | 40% | |
| 4D | 30% | Medium glass |
| 33 | 20% | Light glass |
| 1A | 10% | Very light glass |
| 00 | 0% transparent | |
Alpha Test Results
The images below show shadows (or lack of a shadow) when using the noted shadow options in the launcher's shadow dialog:
Shadow Contrast Summary
| Summary: | |||
|---|---|---|---|
| Background Type | Shadow Strategy | Recommended Alpha | Result |
| Light Wallpaper | Dark/Black Shadow | 20% – 50% (`40` to `80`) | Success: Soft, realistic depth. |
| Dark Wallpaper | White/Light Glow | 80% – 100% (`CC` to `FF`) | Success: A visible “Halo” or “Ambient Lift.” |
| Dark Wallpaper | Any Shadow Color | Below 50% (`80`) | FAILURE: Shadow vanishes into the background noise. See this hack to overcome the failure. |
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