brightness

What API call would I use to change brightness of laptop (.NET)?

I have Windows Server 2008 installed on a Sony laptop and the brightness control doesn't work. I'd like to write a program to allow me to change it. Currently what I have to do is open the Power control panel, click advanced settings, and fight through so many UAC boxes that anybody watching me must think I'm completely crazy. I just w...

Is there a way to query the current brightness level of a the MacBook LCD?

The idea being that, once the brightness passes a certain level, one could switch to a different visual scheme to give greater visibility. Also, if it could be some sort of listener type thing, that would be even better, but I'll take what I can get. ...

How to Make an Image Uniform Brightness (using Python/PIL)

I want to take an image of a document that was photographed and make it look like it was scanned. Since a scanner will put a constant light source over the whole document, I want to achieve that effect on a photo of a document. The desired effect would be to remove any shadows or areas of low light (or at least make them less noticeabl...

WPF image manipulation

I have some idea of changing brightness in contrast, but i was wondering had a simple solution for changing brightness and contrast ...

Brightness/exposure function with vb .net

Hello, I'm making a simple image editor in vb .net, and one of the functions is brightness/ exposure. this is how I'm doing it: For i = 0 To img.Width - 1 For j = 0 To img.Height - 1 Dim s As Color = img.GetPixel(i, j) Dim r As Integer = s.R * 2 Dim g As Integer = s.G * 2 Dim b ...

How to adjust the brightness of the screen on notebook displays

I have a slide bar to adjust the brightness of the screen on notebook displays in my application, but I found those articles from internet are adjusting the Gamma value, the behavior is not really like pressing the special key in keyboard. Is there a way to do it? Thanks in advance. Here is some links what I found. http://www.codeproj...

Changing Backlight Level, iPhone

Hello all, I searched around for a way to set the backlight level within an app on the iPhone. I found a solution here: http://www.iphonedevsdk.com/forum/29097-post3.html The problem I have is, when I add this to my app I get an error and a warning. My code is as follows: #include "GraphicsServices.h" - (void) viewWillAppear:(BOOL)an...

Brighten a section of a webpage background

Is there any way to have a semi-transparent overlay in a webpage and will brighten the underlying content? I'm wanting to have a dynamic content in the background of a transparent overlay with one section highlighted in a brighter than the rest of the background. For example, in the mock-up below there is a graph in the background, over...

Change brightness of blitted bitmap using Allegro

I'm using the Allegro game library to make a tile game. I want the tiles to get exponentially brighter. Unfortunately Allegro does not have a "Brighten" feature. What I then decided to do, was blit a tile to the buffer, then for each pixel that it just blited for that tile, I increased their rgb values and putpixel. The big problem with ...

Linux/Xorg: setting color brightness

Hi all. Is there any command (or API) to set X.Org/Linux color brightness? In other words, I need something as handy as the xgamma command but for changing RGB brightness real-time. Is this possibile? Thanks in advance. ...

How to use JavaScript to measure how bright a users monitor is ?

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 ma...

Android question. Is there a link to a simple example of changing the screen brightness for an activity?

There are apparently at least three different techniques for changing screen brightness in the Android OS. Two of them no longer work post-cupcake and the third accepted technique evidently has a bug. I would like to increase screen brightness at the start of a one-view activity then turn the brightness back to the user setting at the e...

Hex Code Brightness PHP?

I want users on my website to be able to pick a hex colour, and I just want to display white text for dark colours and black text for light colours. Can you work out the brightness from a hex code (preferably PHP)? ...

react to iphone camera changes

i'm searching for a way to analyze the camera's view live. the iphone should recognize and react to sudden changes in brightness. can you give me some hints? leave a comment if my question is not clear enough! ...

Programmatically change Mac display brightness

How to change Mac display brightness from cocoa application? ...

When I load an image in OpenCV it is always darker than the original. Why?

Hey guys and gals, So I load a color .png file that has been taken with an iphone using cvLoadImage. And after it's been loaded, when I immediately display it in my X11 terminal, the image is definitely darker than the original png file. I currently use this to load the image: IplImage *img3 = cvLoadImage( "bright.png", 1); For th...

Handle brightness key press event in a native Windows Mobile application

I need to intercept brightness key press in a device with a hardware keyboard, where that key has the double function of changing brightness and the "0" number: if I can handle it, I can avoid to the user of the application to switch to the numeric keypad in some textboxes that accept only numeric input. I tried to handle that key even ...

Screen brightness in J2ME.

Do you know of any means for changing the screen brightness in J2ME. That is using a vendor-specific API, like Samsung's, etc. Thanks! ...

Automatically detect how bright a user's monitor is?

I have web application and have noticed that there exists a huge variation in users' monitor brightness settings. The brighter a user's monitor, the more washed about my web applications colors look. Is there a way to automatically detect the user's monitor brightness, without the user's involvement, so that I can programmatically adju...

Windows: How to change monitor's backlight brightness

Ever since I've been using an external monitor with my laptop, when I need to change the backlight brightness I have to press the monitor's buttons to navigate through its menu and adjust the brightness. That is really a pain. It's too many button presses! When I was using my laptop's integrated monitor, that was as simple as presing the...