Faint grey lines on exported tiff image occur when imported into other apps

[toxlab]

Each time I export an a tiff image and then import it into MS Word for the Mac (2016) faint grey lines outline the imported bitmapped images (typically a tiff or png imported image(s) to which text has been added). They are not present in the original AD image, but appear in the exported files when imported into Word (and other apps). I have attached two screen shots, the first is a screen shot from AD of the original image and the second is the exported tiff image that has been imported into MS Word 2016 for the Mac. You can see faint grey lines that outline each imported image (originally .png files) in the image in Word, which are not present in the original image. This also occurs if the image is imported into Apple Pages, Autodesk Graphic, so it is not unique to MS Word.  Any help appreciated!

[MEB]

Hi toxlab,

Welcome to Affinity Forums :)

Can you please upload the original .afdesign file so we can take a look?

Thanks.

[toxlab]

Done! let me know if you se the same result. 

[MEB]

Thanks for the files @toxlab.

Which preset are you using when you export as Tiff?

[toxlab]

OK, I did not use the export persona (just found it), but selected export from the File menu and chose tiff export. That gave me the grey lines. Using the export persona I selected tiff, rgb-8, bilinear and a white matte. That eliminated the faint grey lines on the exported tiff. I suspect that it was the white matte that did it, since I did not select that option in the Export function under the file menu. Hence, case solved.