2014/10/15 下午 10:05:32

iphone Programming Glossary: contrast

What is the basic difference between NSTimer, NSTask, NSThread and NSRunloop?

http://stackoverflow.com/questions/1124207/what-is-the-basic-difference-between-nstimer-nstask-nsthread-and-nsrunloop

waitUntilDone Great tips on sending NSNotifications across threads here . Timers are also handled by run loops. In contrast to run loops you are likely to often be using timers directly in your program. The very easiest way of creating a timer..

Applying brightness and contrast with OpenGL ES

http://stackoverflow.com/questions/1506299/applying-brightness-and-contrast-with-opengl-es

brightness and contrast with OpenGL ES I want to change the brightness and contrast of a texture on the iPhone. I've been looking at the sample.. brightness and contrast with OpenGL ES I want to change the brightness and contrast of a texture on the iPhone. I've been looking at the sample provided by apple GLImageProcessing but it only is able to do.. glTexEnvi GL_TEXTURE_ENV GL_SRC0_ALPHA GL_TEXTURE glDrawArrays GL_TRIANGLE_FAN 0 4 How would i go with adding contrast to the texture after this Alternatively would it be a better choice to move to OpenGL ES 2.0 and do this with shaders Here's..

How to implement didReceiveMemoryWarning?

http://stackoverflow.com/questions/2430728/how-to-implement-didreceivememorywarning

approach than using the release method because this prevents a variable from pointing to random remnant data. Note in contrast that setting a variable directly using and not using the setter would result in a memory leak. self.myStringB nil self.myStringD..

Check if UIColor is dark or bright?

http://stackoverflow.com/questions/2509443/check-if-uicolor-is-dark-or-bright

again iphone xcode colors share improve this question W3C has the following http www.w3.org WAI ER WD AERT #color contrast If you're only doing black or white text use the color brightness calculation above. If it is below 125 use white text...

Good way to calculate 'brightness' of UIImage?

http://stackoverflow.com/questions/3992790/good-way-to-calculate-brightness-of-uiimage

green and blue color channels and then use it to determine the average lightness median lightness black white points contrast or other custom functions. Use CGBitmapContextCreate to create a bitmap context backed by a buffer of your creation draw..

iPhone Development - XMLParser vs. libxml2 vs. TouchXML

http://stackoverflow.com/questions/406811/iphone-development-xmlparser-vs-libxml2-vs-touchxml

is best for parsing huge documents and when you only need to retrieve a tiny amount of data from a big file. In contrast to SAX is the DOM model where the entire XML tree is parsed into memory usually with a single call and then you can freely..

Can example “GLImageProcessing” work with multi filters

http://stackoverflow.com/questions/4375479/can-example-glimageprocessing-work-with-multi-filters

work with multi filters I use the example GLImageProcessing but it can not process the image with both brightness and contrast so i write the code to adjust both brightness and contrast but it can't work at all can anybody can help me about this thank.. but it can not process the image with both brightness and contrast so i write the code to adjust both brightness and contrast but it can't work at all can anybody can help me about this thank you for review init glMatrixMode GL_PROJECTION glLoadIdentity.. GL_TEXTURE_ENV GL_COMBINE_ALPHA GL_REPLACE glTexEnvi GL_TEXTURE_ENV GL_SRC0_ALPHA GL_TEXTURE process 2 adjust contrast t 1.6 GLfloat h t 0.5f One pass using two units contrast 1.0 interpolates towards grey contrast 1.0 extrapolates away from..

Breakdown of iOS versions being used [closed]

http://stackoverflow.com/questions/5291823/breakdown-of-ios-versions-being-used

examples of this OS X basically blew away all os9 development with only a polite veneer of legacy support. In contrast in the Windows universe and now in the Google universe Google is the new Windows there is always a general desire to support..

Detect horizontal panning in UITableView

http://stackoverflow.com/questions/5426306/detect-horizontal-panning-in-uitableview

this question I had the same issue and came up with a solution that works with the UIPanGestureRecognizer. In contrast to Erik I've added the UIPanGestureRecognizer to the cell directly as I need just one particular cell at once to support..

GLImageProcessing Multiple Filters?

http://stackoverflow.com/questions/6425861/glimageprocessing-multiple-filters

typedef void procfunc V2fT2f float typedef struct procfunc func procfunc degen Filter const Filter filter brightness contrast extrapolate greyscale hue extrapolate blur The blur could be exaggerated by downsampling to half size #define NUM_FILTERS..

iPhone ImageMagick Library - converting from batch file script to Objective-C using MagickWand API

http://stackoverflow.com/questions/7480812/iphone-imagemagick-library-converting-from-batch-file-script-to-objective-c-us

^ convert.exe channel green level 3.5 100 ^ convert.exe channel blue level 0 93 level 4.7 100 ^ convert.exe brightness contrast 5x3 ^ convert.exe fill.jpg compose multiply gravity center composite ^ convert.exe level 3.5 100 0.91 level 2.7 100 ^ convert.exe.. channel green level 0 87 level 1 100 ^ convert.exe channel blue level 0 100 0.94 level 7 100 ^ convert.exe brightness contrast 1x0 final_converted_image.jpg del source_copy.jpg del fill.jpg The problem is converting the above batch file to be used..

Property with no iVar and getter method?

http://stackoverflow.com/questions/8788730/property-with-no-ivar-and-getter-method

property was not readonly adding a setter still would not work as there is no iVar to set. Created Meth prefixName By contrast characterName works the usual way for a property adding a getter a setter and an iVar. Created Meth characterName Created..

Dispelling the UIImage imageNamed: FUD

http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud

PNG file might consume a few dozen KBs when compressed but consumes over half a MB decompressed width height 4 . By contrast imageWithContentsOfFile will decompress that image everytime the image data is needed. As you can imagine if you only need..