Why the option Whiten background is not applied to the input document (ABBYY FineReader PDF 15)?
The option Whiten background which is checked on the Options window (the menu Tools > Options > the tab Image Processing > Image Preprocessing Settings) is applied to conversion and OCR and for *photo images only:
Whiten background option will be applied automatically *only* to photographic (camera) images.
To apply the 'Whiten background' option to other documents:
- Open the document in OCR Editor > Image Editor;
- Apply Photo Correction to the corresponding page(s):
Note: changes performed in the Image Editor delete the previously OCRed areas (existed text layer) from the corresponding page.