Picture Image

[kiwis]

I've made a picture in photoshop .JPEG to the size i need and when i went down to the local print shop it looks "grainy"

If I made the photo larger say twice the size (the original background was shrunk so i can do this without effect that). would that resolve this issue?

How much bigger should I made it?

[TheBlueAsset]

giving more specific information would help us help you, what size in pixels was the final image, in what size of paper you tried to print it, what do you mean by the original background? if its a plain jpg everything should size accordingly, sometimes the graininess comes from printing in a different aspect ratio and not by the image quality

[Steve]

The print shop should be giving you the specs they require.
I hope you're not overwriting the original JPG but are using Save As after you make any edits.

Ask them what they want and post that info here.
From the "original" we'll guide you through the process.