In my knowledge, the Proof generated by uStore for a Composite Product is based on:
You can control the settings of the PDF via the "template" Proof job of the uProduce "PreviewCampaign" campaign and document. But I'm afraid the point is not here.
I did not see any Proof file of yours, so I can only assume what your complain actually is; I trust it could be related to the "quality" of the JPEG thumbnails.
We recently asked the XMPie Support Team, if the "quality" (I mean: the resolution, or H x W size) can be changed; it turns out it cannot (it was hard-coded).
But even if it could be changed (that's what we did, via a hack, which I cannot elaborate here), one must keep in mind that this Thumbnail "quality" will be felt at two separate moments, with usually two totally conflicting requirements:
- in the Document Builder: each time you change a setting in a page (via the Wrench tool), all thumbnails are reloaded into the page; should there be many (hundreds of) pages, should your thumbnails be heavy and should your internet bandwidth be poor (regardless yours or your customers'), working on the document would become extremely uncomfortable. So, certainly, the lightest the thumbnails are, the best
- in the Proof: as it's the final stage before ordering, you (regardless it's the user, the approver or the uStore Admin operator) need some "quality", to check for any error. So, certainly, the heaviest the thumbnails (embedded in the PDF) are, the best
I hope I clarified (even if I could not provide the magic solution).