Convert PDF to Tiff Gives Blank Tiff Image

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   Greetings,
I'm trying to convert the following file from PDF to Tiff and I'm getting a blank page.  I don't believe there is anything special with the PDF excepts its larger dimensions since it is a land plat.
URL to PDF
https://drive.google.com/file/d/12svFkI6ZjICKAWYBibMNl4bYpRw337FU/view?usp=sharing

I'm using the same code I have used for years and the nrendersuccess returns a value of 1 saying it was successful.

ninstanceid = dplcreatelibrary()
nresult = dplunlockkey(ninstanceid,"key hidden")
cimportname = "2420027_7471RT.pdf"
tcfilename = "c:\temp\test_%p.tif"
nfilehandle = dpldaopenfile(ninstanceid,cimportname,"")
npagecount = dpldagetpagecount(ninstanceid,nfilehandle)
nrendersuccess = dplrenderdocumenttofile(ninstanceid,200,1,npagecount,7,tcfilename)

Since it tells me the render was successful but the page is blank, I'm a bit stuck.

Thanks,

Chad Newman

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chadnewman Members Profile Find Members Posts Beginner Joined: 09 Oct 15 Status: Offline Points: 12	Post Options Post Reply Quote chadnewman Report Post Thanks(0) Quote Reply Topic: Convert PDF to Tiff Gives Blank Tiff Image Posted: 05 May 21 at 8:11PM
	Greetings, I'm trying to convert the following file from PDF to Tiff and I'm getting a blank page. I don't believe there is anything special with the PDF excepts its larger dimensions since it is a land plat. URL to PDF https://drive.google.com/file/d/12svFkI6ZjICKAWYBibMNl4bYpRw337FU/view?usp=sharing I'm using the same code I have used for years and the nrendersuccess returns a value of 1 saying it was successful. ninstanceid = dplcreatelibrary() nresult = dplunlockkey(ninstanceid,"key hidden") cimportname = "2420027_7471RT.pdf" tcfilename = "c:\temp\test_%p.tif" nfilehandle = dpldaopenfile(ninstanceid,cimportname,"") npagecount = dpldagetpagecount(ninstanceid,nfilehandle) nrendersuccess = dplrenderdocumenttofile(ninstanceid,200,1,npagecount,7,tcfilename) Since it tells me the render was successful but the page is blank, I'm a bit stuck. Thanks, Chad Newman

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 05 May 21 at 10:04PM
	Hi Chad, the pdf is made by pdflib and i think it was a bad job. If you look into the content (notepad is enough for this job) perhaps we can see where could be problems... The whole pdf was already made/rendered by an image. It's the result of a scan-process (scan to file). Most of the content is the one large image stream. My tools and routines always are using jpg-output but what shall i tell...? No success. Not with an older library release and no success with the latest release. A blank white page is all i get. Perhaps you've more success if you link another renderer like PDFium for example... Things like TransformFile, CombineContentStream and NormalizePage doesn't help. This flag is telling us... <</Subtype/Image/Width 14388/Height 10771/ ...that the original image has the dimensions 14388 x 10771. This flag is telling us... /MediaBox[0 0 1726.5635 1292.5226]>> ...that the large image was shrinked to 1726 x 1292. This flag is telling us... /BitsPerComponent 1/ ...that it's a b/w-image. But this flag tells... [/Indexed/DeviceRGB ...that's a coloured pdf.
	Cheers, Ingo

chadnewman Members Profile Find Members Posts Beginner Joined: 09 Oct 15 Status: Offline Points: 12	Post Options Post Reply Quote chadnewman Report Post Thanks(0) Quote Reply Posted: 06 May 21 at 4:35PM
	Ingo, Thanks for taking the time to review. I'm glad you had issues and it wasn't just me. Thanks again, Chad

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 06 May 21 at 9:38PM
	Hi Chad, do you have other scanned images as pdf or is this the only one? Like i've said: Looking into the content i think it's only a scan-accident ;-)
	Cheers, Ingo

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 06 May 21 at 10:03PM
	Hi again... ;-) i've tried the "Debenu PDF Tools" - QuickPDF is used inside. Converting to jpeg works! So it should be possible with QuickPDF - so it's not lost time to go on trying ;-)
	Cheers, Ingo