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    <p>Edit: Fixed up the blue filter a little<br> Edit2: Cleaned up the grey filter</p> <p>I required code to do these effects, so I wrote a couple functions for them:</p> <pre><code>UIImage *grayTabBarItemFilter(UIImage *image) { int width = image.size.width, height = image.size.height; UIImage *result = image; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); if (colorSpace == NULL) { return result; } CGContextRef context = CGBitmapContextCreate(NULL, width, height, 8, width * 4, colorSpace, kCGImageAlphaPremultipliedLast); if (context == NULL) { CGColorSpaceRelease(colorSpace); return result; } CGFloat colors[8] = {80/255.0,80/255.0,80/255.0,1, 175/255.0,175/255.0,175/255.0,1}; CGGradientRef gradient = CGGradientCreateWithColorComponents(colorSpace, colors, NULL, 2); CGContextDrawLinearGradient(context, gradient, CGPointMake(0,-(32-height)/2.0), CGPointMake(0,height+(32-height)/2.0), 0); CGGradientRelease(gradient); CGContextSetBlendMode(context, kCGBlendModeDestinationIn); CGContextDrawImage(context, CGRectMake(0,0,width,height), image.CGImage); CGImageRef newImage = CGBitmapContextCreateImage(context); if (newImage != NULL) { result = [UIImage imageWithCGImage:newImage]; CGImageRelease(newImage); } CGContextRelease(context); CGColorSpaceRelease(colorSpace); return result; } struct RGBA { unsigned char red; unsigned char green; unsigned char blue; unsigned char alpha; }; #define BLUE_ALPHA_THRESHOLD 128 #define BLUE_BRIGHTNESS_ADJUST 30 UIImage *blueTabBarItemFilter(UIImage *image) { int width = image.size.width, height = image.size.height; UIImage *result = image; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); if (colorSpace == NULL) { return result; } CGContextRef context = CGBitmapContextCreate(NULL, width, height, 8, width * 4, colorSpace, kCGImageAlphaPremultipliedLast); if (context == NULL) { CGColorSpaceRelease(colorSpace); return result; } UIImage *gradient = [UIImage imageNamed:@"selection_gradient.png"]; CGContextDrawImage(context, CGRectMake(-(gradient.size.width - width) / 2.0, -(gradient.size.height - height) / 2.0, gradient.size.width, gradient.size.height), gradient.CGImage); CGContextSetBlendMode(context, kCGBlendModeDestinationIn); CGContextDrawImage(context, CGRectMake(0,0,width,height), image.CGImage); struct RGBA *pixels = CGBitmapContextGetData(context); if (pixels != NULL) { for (int y = 0; y &lt; height; y++) { for (int x = 0; x &lt; width; x++) { int offset = x+y*width; if (pixels[offset].alpha &gt;= BLUE_ALPHA_THRESHOLD &amp;&amp; ((x == 0 || x == width-1 || y == 0 || y == height-1) || (pixels[x+(y-1)*width].alpha &lt; BLUE_ALPHA_THRESHOLD) || (pixels[x+1+y*width].alpha &lt; BLUE_ALPHA_THRESHOLD) || (pixels[x+(y+1)*width].alpha &lt; BLUE_ALPHA_THRESHOLD) || (pixels[x-1+y*width].alpha &lt; BLUE_ALPHA_THRESHOLD))) { pixels[offset].red = MIN(pixels[offset].red + BLUE_BRIGHTNESS_ADJUST,255); pixels[offset].green = MIN(pixels[offset].green + BLUE_BRIGHTNESS_ADJUST,255); pixels[offset].blue = MIN(pixels[offset].blue + BLUE_BRIGHTNESS_ADJUST,255); } } } CGImageRef image = CGBitmapContextCreateImage(context); if (image != NULL) { result = [UIImage imageWithCGImage:image]; CGImageRelease(image); } } CGContextRelease(context); CGColorSpaceRelease(colorSpace); return result; } </code></pre> <p>To make the blue filter effect work you'll need to include this image in your project as "selection_gradient.png": <a href="http://oi55.tinypic.com/bgwv0j.jpg">selection_gradient.png http://oi55.tinypic.com/bgwv0j.jpg</a><br> Also, you may want to play with the defines to get the effect exactly how you like, I didn't take much time to perfect them, though they look good enough to me.</p> <p>Of course I don't know the exact filters that Apple applied, but I "guestimated" them and they look alright to me. I'm not sure if these functions are iPhone 4 compatible because I'm only using them in an iPad app, but it wouldn't be hard to edit them to your liking.</p>
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    1. POHow to recreate the UITabBarItem image filter?
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    1. POHow to recreate the UITabBarItem image filter?
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    1. COI'm having trouble getting this filter to work on retina devices. Has anyone had any success doing that? I've tried CGContextScaleCTM() but that just makes the image twice as big.
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    2. COYou should just have to change `result = [UIImage imageWithCGImage:newImage];` to `result = [UIImage imageWithCGImage:newImage scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp];`
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    3. COI actually figured out a way to exactly replicate the UITabBarItem filter. It's a bit of a hack, but it's a pixel-perfect copy. I'll post my solution in a moment.
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