StackOverflow2013

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PO
primarykey
Id
15866020
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-04-07T18:18:35.840
FavoriteCount
0
LastActivityDate
2013-04-07T18:18:35.840
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LastEditorUserId
0
OwnerUserId
2098304
ParentId
2137744
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
Just one note: I found that CIColorInvert filter isn't always reliable. For example, if you want to invert back an image inverted in Photoshop, the CIFilter will produce a much lighter image. As far as I understood, it happens because of the differences in gamma value of CIFilter (gamma is 1) and images that came from other sources. While I was looking for ways to change the gamma value for CIFilter, I found a note that there's a bug in CIContext: changing its gamma value from the default 1 will produce unpredictable results. Regardless, there's another solution to invert NSImage, which always produces the correct results - by inverting pixels of NSBitmapImageRep. I'm reposting the code from etutorials.org (<a href="http://bit.ly/Y6GpLn" rel="nofollow">http://bit.ly/Y6GpLn</a>): <pre><code>// srcImageRep is the NSBitmapImageRep of the source image int n = [srcImageRep bitsPerPixel] / 8; // Bytes per pixel int w = [srcImageRep pixelsWide]; int h = [srcImageRep pixelsHigh]; int rowBytes = [srcImageRep bytesPerRow]; int i; NSImage *destImage = [[NSImage alloc] initWithSize:NSMakeSize(w, h)]; NSBitmapImageRep *destImageRep = [[[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL pixelsWide:w pixelsHigh:h bitsPerSample:8 samplesPerPixel:n hasAlpha:[srcImageRep hasAlpha] isPlanar:NO colorSpaceName:[srcImageRep colorSpaceName] bytesPerRow:rowBytes bitsPerPixel:NULL] autorelease]; unsigned char *srcData = [srcImageRep bitmapData]; unsigned char *destData = [destImageRep bitmapData]; for ( i = 0; i < rowBytes * h; i++ ) *(destData + i) = 255 - *(srcData + i); [destImage addRepresentation:destImageRep]; </code></pre>
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PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. PODraw standard NSImage inverted (white instead of black)
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 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USZevrix
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