This has been an ongoing debate/discussion for some time now. As you may know we request from customers that if they have artwork, and they want us to use it, they must (if possible) give us the artwork in vector format.
Ok, so that’s all well and good, but perhaps people don’t understand why we need vector-based artwork rather than bitmap-based. Could that be where the misunderstandings arise?
A good explanation of this can be found here at the Wikipedia entry. It has a useful graphic to highlight the difference.
Essentially you can magnify a vector graphic any amount and it will retain its clarity and design, because it is based on lines/curves/polygons/shapes, filling in the internals with pixels as it needs. If you magnify a bitmap, since it is based on individual pixels at the point of design, it loses clarity as the picture gets larger because those individual pixels also get magnified.
On to formats, what formats are used for vector graphics? Well we use Adobe Illustrator here, so AI format is standard for us – this also includes EPS files when it is saved in vector format. It is also possible to save PDF files in vector format, but to be honest most people don’t, so we try to avoid them if we have a choice.
Just to include these, because we’re talking about vector files, there are other formats, such as SVG, VML and SWF, but we do NOT accept these since we can’t work with them.
Most people believe that JPG and GIF files are perfectly good enough for their artwork. These are bitmap graphics files. But please remember, if you supply us such a file, and it is 30mm x 40mm, but you want it magnifying to use on a large sign, it will be horribly pixellated and there is no amount of graphics magic we can apply that will fix that. That is why we ask if you have AI or EPS files instead.
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