Add an option to generate one layer PDF file output

[tonyho]

Issues

• [X] I have browsed through the Issues. 我已浏览过Issues，确定没有重复的建议。

Expected behavior 预期的功能

Except the 2 layered PDF, can you kindly to add an one layer pdf export option? Or can I extract the OCRed(text) PDF layer using other free tools?

Approximate reference (optional) 近似的参考（可选）

None

[hiroi-sora]

I've just added this feature; you can pull from the main branch to test it. (Alternatively, you can copy the UmiOCR-data directory from the main branch and overwrite the same directory in the Release v2.1.1 .)

In the Batch Documents OCR tab, check the Advanced option in settings. Now, the Output file format will have an additional option: .pdf One-layer plain text document. This allows for the output of a single-layer PDF containing only the OCR results, without the original image layers.