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Hi Brian
As Neil pointed out, a standard size is 85mm x 55mm. However, cards can come in a multitude of sizes - 88 x 55, 90 x 50, 85 x 45 etc. If you're looking for a standard wallet size, then stick with 85 x 55.
File format. If you're having a full-colour card (CMYK) then a .tiff is ideal, providing it is 300dpi. As you're a photographer, I presume you're using Photoshop so just make sure 'mode' is set to CMYK, and the workspace is set to 300dpi, at actual size.
If the artwork extends over the card, (bleed), then you need to add 3mm to all sides of the card. e.g. If using an 85 x 55 size, set the workspace to 91 x 61. Then put guides in 3mm from each edge. The area inside the guides is your artwork. The area over the guides will be trimmed off at the cutting stage, leaving you with a final 85 x 55 card.
Hope this helps.
Paul
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