CODEWITHSUNDEEP
iosobjective-cciimage
YosiFZ
YosiFZ

Reputation: 7890

Flip CIImage Horizontal

I am trying to flip my CIImage Horizontal with :

image = [image imageByApplyingTransform:CGAffineTransformMakeScale(1, -1)];
image = [image imageByApplyingTransform:CGAffineTransformMakeTranslation(0, sourceExtent.size.height)];

But i always get the image flip vertical instead

Upvotes: 6

Views: 4401

Answers (5)

Albert Renshaw
Albert Renshaw

Reputation: 17882

This will allow you to flip a UIImage (or CIImage) in either horizontal or vertical directions:

UIImage *image;
BOOL mirrorX, mirrorY;


CIImage *ciimage = [CIImage imageWithCGImage:image.CGImage];
ciimage = [ciimage imageByApplyingTransform:CGAffineTransformMakeScale(mirrorX?-1:1, mirrorY?-1:1)];
ciimage = [ciimage imageByApplyingTransform:CGAffineTransformMakeTranslation(mirrorX?image.size.width:0, mirrorY?image.size.height:0)];
image = [UIImage imageWithCIImage:ciimage];

Upvotes: 0

Rotem
Rotem

Reputation: 2356

This what worked for me:

UIImage(ciImage: ciImage.oriented(.upMirrored).oriented(.left))

Upvotes: 1

Luis
Luis

Reputation: 301

This will properly flip the image horizontally and maintain proper coordinates.

In Obj-C:

image = [image imageByApplyingCGOrientation: kCGImagePropertyOrientationUpMirrored];

In Swift:

image = image.oriented(.upMirrored)

https://developer.apple.com/documentation/coreimage/ciimage/2919727-oriented

If what you want is to orient it in such a way that you can use it in an UIImage, then you want to flip it in both axes.

image = image.oriented(.downMirrored)

Upvotes: 7

Kai Schaller
Kai Schaller

Reputation: 443

Alex almost had it, but you need to adjust the translation as well:

image = [image imageByApplyingTransform:CGAffineTransformMakeScale(-1, 1)];
image = [image imageByApplyingTransform:CGAffineTransformMakeTranslation(sourceExtent.size.width, 0)];

Upvotes: 2

Alex Kosyakov
Alex Kosyakov

Reputation: 2176

Try this way:

image = [image imageByApplyingTransform:CGAffineTransformMakeScale(-1, 1)];
image = [image imageByApplyingTransform:CGAffineTransformMakeTranslation(0, sourceExtent.size.height)];

Upvotes: 10

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