brightness

How do you get the preferred screen brightness in Android? To change the screen brightness I use WindowManager.LayoutParams.screenBrightness . According to the documentation: This can be used to override the user's preferred brightness of the screen. A value of less than 0, the default, means to use the preferred screen brightness. 0 to 1 adjusts the brightness from dark to full bright. When screenBrightness is less than 0 I would like to start with the preferred screen brightness. How can I get this value? I'll try to answer because I already searched for this some time ago. My short answer

I have a colour value in JS as a string #ff0000 How would I go about programatically calculating a brighter/lighter version of this colour, for example #ff4848 , and be able to calculate the brightness via a percentage, e.g. increase_brightness('#ff0000', 50); // would make it 50% brighter function increase_brightness(hex, percent){ // strip the leading # if it's there hex = hex.replace(/^\s*#|\s*$/g, ''); // convert 3 char codes --> 6, e.g. `E0F` --> `EE00FF` if(hex.length == 3){ hex = hex.replace(/(.)/g, '$1$1'); } var r = parseInt(hex.substr(0, 2), 16), g = parseInt(hex.substr(2, 2), 16), b

Does anyone have an idea how to implement an Brightness Screen Filter like the one here: http://www.appbrain.com/app/screen-filter/com.haxor I need a starting point and I can't figure out how to do it. Just make a transparent full screen activity that lets touches pass through. To make touches pass through use the following Window flags before setting the contentView: @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Window window = getWindow(); // Let touches go through to apps/activities underneath. window.addFlags(FLAG_NOT_TOUCHABLE); // Now set

public void SetBright(float value) { Window mywindow = getWindow(); WindowManager.LayoutParams lp = mywindow.getAttributes(); lp.screenBrightness = value; mywindow.setAttributes(lp); } I want to adjust the screen brightness. But nothing happens when i try using this method. Could it be because i use the KEEP_SCREEN_ON flag? Make sure that "Auto Brightness" is not enabled prior to setting the screen brightness. You can do this manually in Settings>Display or using code if you are using Android 2.2 or above SDK. Something like: int brightnessMode = Settings.System.getInt(getContentResolver(),

The following applies to the Android operating system. I am trying to estimate how dark (or light) it is in the room where the phone is located using the camera. The idea is that the camera can return a certain brightness level, which I can use to determine the amount of light in the surroundings of the phone. My question is simple: how do I use the camera (either the front of back camera) to get this amount of brightness (the "amount of light")? Thanks in advance. kcoppock Here is how you register a listener on the light sensor: private final SensorManager mSensorManager; private final Sensor

What is an easy way to adjust brightness contrast and gamma of an Image in .NET Will post the answer myself to find it later. c# and gdi+ have a simple way to control the colors that are drawn. It’s basically a ColorMatrix. It’s a 5×5 matrix that is applied to each color if it is set. Adjusting brightness is just performing a translate on the color data, and contrast is performing a scale on the color. Gamma is a whole different form of transform, but it’s included in ImageAttributes which accepts the ColorMatrix. Bitmap originalImage; Bitmap adjustedImage; float brightness = 1.0f; // no