GHOSTSCRIPT GRAYSCALE PDF

As previously stated, iText could do it, but it would be a matter of walking through all the content and images looking for non-grayscale color spaces and converting them in a space-specific manner. The good news is that iText[Sharp] is capable of operating in multiple threads, provided each document is used from one thread at a time. And then a light went on above my head Blending modes and transparency groups! Take all the current page content and stick it in a transparency group that is blended with a solid black rectangle that covers the page. Yep, PDF reference section

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As previously stated, iText could do it, but it would be a matter of walking through all the content and images looking for non-grayscale color spaces and converting them in a space-specific manner. The good news is that iText[Sharp] is capable of operating in multiple threads, provided each document is used from one thread at a time.

And then a light went on above my head Blending modes and transparency groups! Take all the current page content and stick it in a transparency group that is blended with a solid black rectangle that covers the page.

Yep, PDF reference section Now, the bad news. If your goal in switching to gray scale is to save space, this will fail utterly. The software rendering the PDF better be pretty hot stuff too. This is advanced graphics stuff here, infrequently used by Common PDF Files, so the last sort of thing to be implemented. For each original page Create a new page. Cover it with a black background.

It does require some PDF-Fu, but not nearly as much as the "convert each color space and image in various ways as I step through the document". Deeper knowledge, less code to write.

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See the AdjustWidth option documentation below for important information about these devices. Multi-strip files reduce the memory requirement on the reader, since readers need only store and process one strip at a time. The TIFF 6. If the value of the MaxStripSize parameter is smaller than a single image row, then no error will be generated, and the TIFF file will be generated correctly using one row per strip.

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Perhaps gs is complaining about that? However, running identify -verbose file. I also had some scanned color pdfs and grayscale ghostzcript that I wanted to convert to bw. Black pixels rather vectors should remain black and everything that is not purely black should ghostscrilt i. Phyast10 94 1 It will create a file called input-gray.

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GHOSTSCRIPT GRAYSCALE PDF

Kagajora How to convert a color pdf to black-white? Hi jan, Thanks, your warning is ghostdcript true! If I print out the ink converage it is using C, M, and Y to make gray. My solution uses gs to extract grayscale bmp files from the pdf, convert to threshold those bmps to bw and save them as tiff files, and then img2pdf to compress the tiff images and merge them all into one pdf.

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