Covert jpeg to tiff

[harley12]

Hi, 

I am making a magazine and I need to convert the images to print ready tiff files rather than using JPEG's. How do I do this 

[Peter Villevoye]

Well, I have seen my fair share of these stitching lines in printed output.

Probably because the print operator is totally nuts or blindfolded, or they are using some ancient PostScript emulation, based on tapping into screen-routines. Especially large-format printers in CAD environments suffer a lot from these crippled low-cost renderers.

But back on-topic: what's the benefit of going from JPEG to TIFF ? Nada.

It will only fill-up your harddisk a lot quicker...

[rob day]

or they are using some ancient PostScript emulation, based on tapping into screen-routines

I think it is worth noting that it is the device that is introducing the visible artifacts, and not the PDF/X-1a flattening. If the page is RIP’ed with anti-aliasing (i.e. typically any relatively low res display), the flattened, anti-aliased, tile boundaries become visible—that would not happen with a high res platemaker.

You can see the effect by "RIPing" a PDF/X-1a page into Photoshop with and without anti-aliasing checked. Here at 72ppi the difference is obvious:

Platemaker and imagsetter RIPs don't need anti-aliasing because they are high res and one wouldn't want gray pixels on the edge of something like black only text.

So the same PDF/X-1a opened at a typical platemaker res 2800 ppi with no anti-aliasing:

[rob day]

RGB is fine with a vendor using a quality color-managed workflow.

Even in that case the printer’s conversion could be wrong. The client could be running a bad monitor profile—the  accurate display of any RGB editing space depends on the system’s monitor profile generated by a proper calibaration.

The reason online short run printers want PDF/X-1a isn’t because they are old fasion, it’s because the automation can’t catch a problem color like 0|0|255 RGB blue, which is unprintable no matter what monitor, source, and destination profiles are used. And although it is unusual, live transparency can still fail depending on the effects used.

https://community.adobe.com/t5/indesign/color-and-blending-modes-between-placed-ai-file-and-indesign...