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    <p>well - from my experience you cannot just grab the pixels that are in the buffer right now you need to reestablish the right context, draw and grab THEN before finally releasing the context</p> <p>=> This is mainly true for the device and ios6 in particular</p> <pre><code>EAGLContext* previousContext = [EAGLContext currentContext]; [EAGLContext setCurrentContext: self.context]; [self fillBuffer:sender]; //GRAB the pixels here [EAGLContext setCurrentContext:previousContext]; </code></pre> <p>alternatively (thats how I do it) create a new FrameBuffer, fill THAT and grab pixels from THERE</p> <pre><code>GLuint rttFramebuffer; glGenFramebuffers(1, &amp;rttFramebuffer); glBindFramebuffer(GL_FRAMEBUFFER, rttFramebuffer); [self fillBuffer:self.displayLink]; size_t size = viewportHeight * viewportWidth * 4; GLubyte *pixels = malloc(size*sizeof(GLubyte)); glPixelStorei(GL_PACK_ALIGNMENT, 4); glReadPixels(0, 0, viewportWidth, viewportHeight, GL_RGBA, GL_UNSIGNED_BYTE, pixels); // Restore the original framebuffer binding glBindFramebuffer(GL_FRAMEBUFFER, framebuffer); glDeleteFramebuffers(1, &amp;rttFramebuffer); size_t bitsPerComponent = 8; size_t bitsPerPixel = 32; size_t bytesPerRow = viewportWidth * bitsPerPixel / bitsPerComponent; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast; CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, pixels, size, ImageProviderReleaseData); CGImageRef cgImage = CGImageCreate(viewportWidth, viewportHeight, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpace, bitmapInfo, provider, NULL, true, kCGRenderingIntentDefault); CGDataProviderRelease(provider); UIImage *image = [UIImage imageWithCGImage:cgImage scale:self.contentScaleFactor orientation:UIImageOrientationDownMirrored]; CGImageRelease(cgImage); CGColorSpaceRelease(colorSpace); </code></pre> <p>Edit: removed call to presentBuffer</p>
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    1. PODisplaying a screen shot generated UIImage is not displaying in UIImageView (for device only)
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    1. CONote that using `glReadPixels()` after `-presentRenderbuffer:`, as you describe in the first code segment above, will fail on iOS 6.0+ and is unsupported on earlier iOS versions.
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      1. USBrad Larson
    2. COYes it did fail somewhere. I wrote the first inline. The thing is that you have to do what i wrote and not try to read the current buffer context currently 'onsceen'
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    3. COnote: edited it to remove that call
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