Unwanted lines (stitching) in image on indesign

[oanisr23574962]

Hi, newbie to indesign here.

I've created a picture book for print in indesign, i've noticed that on some of the images there are strange almost grid like lines present. This is actually in indesign even before i export a pdf but they also appear when i export too. I've gone back and checked the source artwork and these lines are not present. Sorry if this is an easy one or has been covered before. Im using the latest version. Any pointers appreciated. Thanks Oanis

[oanisr23574962 · Accepted solution]

I think i've found the problem, this image was saved as a 16bit tiff file, i re-exported the original tiff as 8bit and brough back in to Indesign, no lines now in there or in the export. Thanks all.