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Posted

The document can be scaled to a different size at export. Depending on content of the document like bitmap/pixel layers any scaling can have adverse effects like blurring. 
So it totally depends on high critical you are against such minor changes. 75% of users don’t care, especially when printing. 25% of users cannot tolerate any deviation from getting exports which look different from rendering in app.

If you use pure vector objects this can scale up or down at a large scale, but there are always limits.

another aspect in its literal sense: formats like DIN or Letter have different aspect ratios, so you may get black or white edges, or cut off a pair of edges.

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Posted

@Keith from Winnipeg Welcome to the Affinity Forums. 

Normally, I prefer to choose the document size and resolution that matches my final output dimensions/requirements. So if your final output size is B3, it would make sense to select that as your document size. 

Having said that, you can scale a document larger or smaller when printing. If the aspect ratio (height to width) is the identical, then none of your image will be cropped when outputting to the new dimensions. If the aspect ratio is different, some of your document image will end up being cropped, unless you choose to stretch it and distort the image. In the USA, 8x10 and 5x7 have different aspect ratios, so printing an 8x10 on 5x7 paper (or vice versa) will result in some of the image being cropped. (The US uses antiquated, and stupid, paper sizes...A and B sizes all have the same aspect ratio).

When working with photos (or other bitmap/pixel data) it's generally a good idea to make your document the same size as your final output, at least if you want to retain the same DPI on output. If you upscale your image when printing, your original edit will be lower resolution (same number of pixels spread out over a larger area). So, if you set up your document to A3 at 300 dpi, then print to B3, you will end up with fewer dots per inch because those pixels are spread out over a larger area (B3 being bigger than A3).

With pure vector images (i.e., Designer, using no pixel based elements), it's less of a concern because all lines, shapes, etc, are defined mathematically. Pure vector images are infinitely scalable without loss of resolution. If your vector document includes any bitmap elements, they follow the same resolution issues as described above for photos. 

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