Albedo: A Reflectance App 1.1
Free Version
Publisher Description
Albedo is an app designed to measure the albedo (or reflectance) of a surface. Albedo is simply defined as the ratio of light reflected from a surface to the light incident upon the surface. The albedo of a surface can be easily interpreted as the percent of incident light reflected by the surface (e.g. Albedo of fresh snow ~ 90%; Albedo of asphalt ~ 10%). The Albedo app is able to measure both the broadband albedo (across the entire visible spectrum) and the spectral albedo in the red, green, and blue color channels of camera.
IMPORTANT: Albedo requires the use of an 18% photographers gray card as a reference. Gray cards are widely available at photography shops and online. Visit the supporting website for more information on gray cards.
Albedo has an easy to use interface that guides users through the collection of two images: a gray card image and an image of any surface. After the images are collected they can be analyzed immediately. In the analysis of the images, the Albedo app calculates the albedo of the surface in the RGB color channels of the camera. The data is instantly saved and can be accessed again via the Albedo app or downloaded onto a computer from Albedo's data folder (accessible through iTunes).
How it works:
Albedo uses the camera as simple light sensor (photometer). Relative light intensity can be measured by normalizing the camera pixel values by the exposure. Therefore, the three color channels of the camera (RGB: Red, Green, Blue) provide a measure of light intensity in three regions of the visible spectrum.
The light intensity reflected from the surface is measured when the user captures an image of the surface. This is normalized by the ambient illumination using the gray card image. The final product is a nearly illumination independent measure of the surface albedo. Surface albedo is an important parameter used by environmental scientist to understand how different surfaces and substances interact with light. Albedo is commonly used in climatology, astronomy, and geoengineering.
Mar 29, 2016
Version 1.1
This app has been updated by Apple to display the Apple Watch app icon.
Fixes Camera Permission Bug
About Albedo: A Reflectance App
Albedo: A Reflectance App is a free app for iOS published in the System Maintenance list of apps, part of System Utilities.
The company that develops Albedo: A Reflectance App is Thomas Leeuw. The latest version released by its developer is 1.1.
To install Albedo: A Reflectance App on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2016-03-29 and was downloaded 8 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Albedo: A Reflectance App as malware if the download link is broken.
How to install Albedo: A Reflectance App on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the Albedo: A Reflectance App is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After Albedo: A Reflectance App is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
