StackOverflow2013

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plurals

PO
primarykey
Id
7501813
data
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0
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0
ClosedDate
CommentCount
1
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2011-09-21T14:45:58.350
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2011-09-21T14:45:58.350
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2017-05-23T12:19:46.840
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2
Score
4
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text
Body
I don't believe that resolution is your issue here. If you aren't seeing the grayish outlines on your drawing when it appears on the screen, odds are that you're observing a compression artifact in the saving process. Your image is probably being saved as a lower-quality JPEG image, where artifacts will appear on sharp edges, like the ones in your drawing. To work around this, Ben Weiss's answer <a href="https://stackoverflow.com/questions/1379274/uiimagewritetosavedphotosalbum-saves-to-wrong-size-and-quality/3314686#3314686">here</a> provides the following code for forcing your image to be saved to the photo library as a PNG: <pre><code>UIImage* im = [UIImage imageWithCGImage:myCGRef]; // make image from CGRef NSData* imdata = UIImagePNGRepresentation ( im ); // get PNG representation UIImage* im2 = [UIImage imageWithData:imdata]; // wrap UIImage around PNG representation UIImageWriteToSavedPhotosAlbum(im2, nil, nil, nil); // save to photo album </code></pre> While this is probably the easiest way to address your problem here, you could also try employing multisample antialiasing, as Apple describes in the "<a href="http://developer.apple.com/library/ios/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/WorkingwithEAGLContexts/WorkingwithEAGLContexts.html#//apple_ref/doc/uid/TP40008793-CH103-SW12" rel="nofollow noreferrer">Using Multisampling to Improve Image Quality</a>" section of the OpenGL ES Programming Guide for iOS. Depending on how fill-rate limited you are, MSAA might lead to a little bit of slowdown in your application.
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1. This table or related slice is empty.
PostParentId
1. POScreenshot of OpenGL ES content for Paint app
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. USBrad Larson
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1. POScreenshot of OpenGL ES content for Paint app
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1. This table or related slice is empty.
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1. VO
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 VTAcceptedByOriginator
2. VO
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 VTUpMod
3. VO
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CommentsPostId
1. COThanks Brad, this is what I was looking for!
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 USuser392406

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