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swift - PNG/JPEG representation from CIImage always returns nil

Just begin a new graphics context and draw your grayscale image there. iOS 10 or later you can use UIGraphicsImageRenderer, for older iOS ...

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查詢 「CIImage」的人也找了：

  1. CIImage extent
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  2. createCGImage
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  3. CIFilter
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  4. CIContext render
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  5. CIImage rotate
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  6. Core Image
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  7. Ciimage cropped
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  8. Ciimage transformed
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