Can a certified PDF be generated from a layout that has Tiffs using LZW compression?

[truetype1]

I have seen PDF pages go to press a thousand times from that were created in Indesign. The images in the layouts were tiffs that used LZW compression. Why am i suddenly being told by a new co-worker that PDF/x does not allow for LZW compression in the tiff files. What am I missing here, Im confused.

caveat, If the PDF being generated from Indesign is set to be PDF/x ## compliant, is the LZW compression in the placed tiffs removed, or does it stay intact until the pdf hits the RIP?

All and any answers are appreciated. Thanks



-T

 

[mattbeals]

LZW is simply not allowed in PDF/X. The images were likely being recompressed when exporting to PDF from InDesign. The new guy is right.

 

[truetype1]

Thanks Matt. I almost sent this message directly to you, because I knew you would chime in at one point or another. So could you say with any confidence that the images were being re-compressed during the pdf generation, lets say if Jpg compression high quality was selected in the pdf presets. Do you believe that to be accurate?

 

[mattbeals]

Absolutely they are being recompressed either by InDesign if using PDF/X settings or the preflight function.

You are always welcome to contact me direct.