PDF conversion from color to grayscale

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egitre
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PDF conversion from color to grayscale

Post by egitre » Wed Jul 17, 2019 4:56 pm

I have a collection of OCRed PDFs. The JPEG images in the PDFs are currently in color. I know that I can import the images from PDFs into grayscale upon opening, but the various output options only appear to save the current image in the browser window into grayscale. Is there a way to transform all images in a PDF from color to grayscale. Batch conversation of multiple PDFs would be amazing, since I have a number of them currently saved in color. Also, I want to preserve annotations, OCRed text, etc., in the saved PDF output file.

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Re: PDF conversion from color to grayscale

Post by forum_adm » Thu Jul 18, 2019 6:02 am

Hi,

the function Resample PDF in Convert&Modify can convert to B&W images with keeping all other PDF content.

Thorsten
Screenshot 2019-07-18 08.00.14.jpg
Screenshot 2019-07-18 08.00.14.jpg (112.76 KiB) Viewed 391 times

egitre
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Country: USA

Re: PDF conversion from color to grayscale

Post by egitre » Thu Jul 18, 2019 6:15 am

Thank you for responding. I got to the screen shown in your screenshot. After selecting Start selected Function, followed by Convert to B&W (leaving 128 as the threshold value), Graphic Converter indeed created a new output file. Yet all the images are still in color.

egitre
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Joined: Wed Jul 17, 2019 4:50 pm
Country: USA

Re: PDF conversion from color to grayscale

Post by egitre » Sun Jul 21, 2019 4:28 am

My reply seems not to have been saved. In any event, I tried this feature and the resulting PDF GraphicConverter produced was still (also) in color. Any suggestions?

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