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Photo Grayscale Filter With XLabs Photo

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I'm trying to improve the OCR Xamarin.Tesseract.
The best way to improve it is by processing the image before it's processed by the OCR, putting it at a grayscale filter and adjusting the contrast, clip and brightness. I'm using XLabs to take the photo, but I don't know any library or way to apply a filter over it... someone knows a way or library to do it?

PS: I'm using Xamarin.Forms

Thanks, Mario.


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