brightness

问题 I have tryed many codes, and looked at Android developers but couldn't make it work. I want the seek bar to adjust my bitmap image brightness 回答1: check the example given at Increase/Decrease Brightness of Image and do as shown below on seekbar progress changes int brightness; SeekBar seekbarbrightness=(SeekBar)findViewById(R.id.seekBar1); seekbarbrightness.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar arg0) { // TODO Auto

问题 I have tryed many codes, and looked at Android developers but couldn't make it work. I want the seek bar to adjust my bitmap image brightness 回答1: check the example given at Increase/Decrease Brightness of Image and do as shown below on seekbar progress changes int brightness; SeekBar seekbarbrightness=(SeekBar)findViewById(R.id.seekBar1); seekbarbrightness.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar arg0) { // TODO Auto

问题 I've noticed that the brightness of computer monitors drastically varies between computers. As such, this changes the look of web pages greatly. Is there a way to use JavaScript to automatically detect how bright (or dark) a users monitor is so that I can adjust my web page colors accordingly? UPDATE Please note that I do not want manual user involvement. I want this detection to be automatic so that users don't realize I dynamically change the color palette automatically based on the

问题 I am new to applescript and command line tools. I installed a command line tool to control the brightness of the iMac in Terminal. I installed the following: https://github.com/nriley/brightness After installing, I noticed a new exec file in /usr/local/bin/ called "brightness". The Internet told me, that applescript only knows the command lines found in /bin/sh. "brightness" is not found there, and I can't copy the exec file to this directory. So it makes sense, that I get the error "sh:

问题 I just the want to change the brightness of the backlit by programming. If should use the private API, never mind, just want to finish the function. Anyone can tell me which API should I to use? 回答1: Might want to check out this article: http://www.osxbook.com/book/bonus/chapter10/light/. It was mentioned in a previous question that might be related to this question. Please note that the article (at the time of writing [2006],) does say: There Are No Published Motion/Light Sensor APIs 来源：

问题 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. 回答1: Here is how you

问题 I'm writing a game with LibGDX and Box2DLights for lighting. The first problem is when my lights overlap each other. I have directional light on sun and point light on character. When they overlap output color is way too bright. I tried changing colors of lights but lowering these makes lights useless when there's only one light(too dark). My second problem is the colors are a bit grayed out(see on screen). Image showing my problems - first screen is too bright, second is with only one light

问题 Why can't I set screen brightness in applicationDidEnterBackground or applicationWillResignActive? This is my code: - (void)applicationDidEnterBackground:(UIApplication *)application { [[UIScreen mainScreen] setBrightness:1.0]; } Can't understand it...!? It works in applicationDidEnterForeground etc, just not when i close the app using the home button. Thanks to anyone that can help... 回答1: It's probably because your app is relinquishing control to the OS, and the OS will then control the

问题 Why can't I set screen brightness in applicationDidEnterBackground or applicationWillResignActive? This is my code: - (void)applicationDidEnterBackground:(UIApplication *)application { [[UIScreen mainScreen] setBrightness:1.0]; } Can't understand it...!? It works in applicationDidEnterForeground etc, just not when i close the app using the home button. Thanks to anyone that can help... 回答1: It's probably because your app is relinquishing control to the OS, and the OS will then control the

问题 I want to adjust the brightness of an image to a certain value in OpenCV. For example, consider this image: I calculate the brightness with: import cv2 img = cv2.imread(filepath) cols, rows = img.shape brightness = numpy.sum(img) / (255 * cols * rows) and I get an average brightness of 35%. To bring it to 66%, for example, I do: minimum_brightness = 0.66 alpha = brightness / minimum_brightness bright_img = cv2.convertScaleAbs(img, alpha = alpha, beta = 255 * (1 - alpha)) and I get an image