brightness

I want to control the brightness of the main-screen within my Mac OS X app (like the F1/F2 buttons). In iOS, there's something like this: UIScreen.mainScreen().brightness = CGFloat(0.5) In OSX we have NSScreen, which is nice to find out what the main-screen is, but it misses the .brightness method. So how can I adjust the monitor brightness using Swift on OSX? There's no such nice API for doing this on OS X. We have to use IOServiceGetMatchingServices to find "IODisplayConnect" (the display device) then use the kIODisplayBrightnessKey to set the brightness: func setBrightnessLevel(level: Float

I converted a bunch of "normal" JPG photos via convert infile -colorspace Gray outfile to monochrome. However the result is for all images very dark. Here a sample conversion: original photo and converted monochrome image . Is there a better way to convert a photo-realistic image with ImageMagick to gray-scale? The documentation states that when changing the color space, the colors are converted from their original gamma to linear before the conversion. You need to convert them back to an appropriate gamma. convert infile -colorspace Gray -gamma 2.2 outfile 来源： https://stackoverflow.com

I use [[UIScreen mainScreen]setBrightness: ] (in sdk 5.0) to change the system background light in my app. The following steps work with my app: Active the app, get the system brightness as default, then save as sysBright. Change the brightness with my app, changed brightness, then save as appBright. ResignActive app with home button or lock button, set brightness to sysBright (step 1 value, system default brightness). Active app again. Then it will repeat the above steps form 1 to 3. Something is wrong with step 3, when I inactivate the app with the lock button, the function

How to change Mac display brightness from cocoa application? Alex King CGDisplayIOServicePort is deprecated in OS 10.9 – so you have to use IOServiceGetMatchingServices to get the service parameter for IODisplaySetFloatParameter . Here's a basic function that looks for services named "display" and changes their brightness. - (void) setBrightnessTo: (float) level { io_iterator_t iterator; kern_return_t result = IOServiceGetMatchingServices(kIOMasterPortDefault, IOServiceMatching("IODisplayConnect"), &iterator); // If we were successful if (result == kIOReturnSuccess) { io_object_t service;

How do I programmatically change the monitor brightness on Linux? I'm using SLES 11. christof You can always use xrandr --output LVDS1 --brightness 0.9 You can try using xbacklight. xbacklight -set 100 artemis_clyde For me it works perfectly with xbacklight . If you for example wish to set up a key binding, you can use bindsym $SUPER+Shift+plus exec xbacklight -inc 10 bindsym $SUPER+Shift+minus exec xbacklight -dec 10 in your window managers config (I use i3) to regulate your screen's brightness level. I wouldn't recommend xrandr for this since it doesn't stop at 100% brightness automatically.

How would I program the ability to change brightness in-app? I know that its possible as I have seen at least three apps that can do it. This would be very useful for my app. I know that it's only possible in iOS 5 with the UIScreen Class, but I have no idea how to program it. Please help me! The UIScreen class has a new property called brightness . In addition, there's another property called wantsSoftwareDimming that (when set to YES ) allows you to go below the lowest brightness supported by the hardware, because a special "dimming view" is overlaid over the screen to darken things even