How to protect text from recognition
Posted: 2011-09-02T06:25:28-07:00
Hi!
I have couple of PDF files with text. I can "render" them to PNG with any dpi I like (with Ghostscript).
After "rendering" files, I get couple of black-white (even not grayscale) PNG files with rendered text.
So, there's the question - what is the best way to "distort" these files to protect them?
1) I understand that there's no absolute protection.
2) I need these files to be readable by men
So, I cannot swirl or wave them, to make them captcha-like
3) I tried to replace plain color text (black) with gradient; tried to put watermark text of arbitraty angle; tried to play with colors. No way. At least, Abbyy FineReader easily read my texts.
I cannot realize, what to do.
Any ideas would be very appreciated.
I have couple of PDF files with text. I can "render" them to PNG with any dpi I like (with Ghostscript).
After "rendering" files, I get couple of black-white (even not grayscale) PNG files with rendered text.
So, there's the question - what is the best way to "distort" these files to protect them?
1) I understand that there's no absolute protection.
2) I need these files to be readable by men
So, I cannot swirl or wave them, to make them captcha-like 3) I tried to replace plain color text (black) with gradient; tried to put watermark text of arbitraty angle; tried to play with colors. No way. At least, Abbyy FineReader easily read my texts.
I cannot realize, what to do.
Any ideas would be very appreciated.