Thank you for explaining!
1.
The poster itself will be A0 size:
Size 84.5 x 119.3 cm
Resolution 5821 x 8219 pixel
But, as you can see from the screen shot, the quality problem lies also with the letters, not only the image. I have that image in many differend sizes, formats, here:
https://www.dropbox.com/sh/8getaa20wvkb ... ZnWJa?dl=0--------------------------------------------
OT
2.
Another Inkscape challenge concerns the background. When I upload a pdf saved from a Photoshop creation, the resulting background is white and homogeneous in Vistaprint. When I upload a pdf saved from a Inkscape, the resulting background of the image stands out against the background of the poster in Vistaprint. I do not set any background in Photoshop or Inkscape and I use the same image in both.
3.
Since Vistaprint accepts the psd format, is there any way to convert an svg file to psd?
Again, thank you for your time and for your expertise. I sincerely appreciate both!
Tommaso