For example:
Windows Explorer tells you that your 3" x 3" image has a file size of 1.22MB. Now, do the following:
Multiply 1.22MB x 344000 = 419680
Divide by 3 = 139893
Divide again by 3 = 46631
Now hit the Square-Root () or SQRT button on your calculator = 215.94 dpi's = approximate resolution of your 3 inch by 3 inch digital image.

Note:
If at all possible, you should always send us your files in the .ai format as we have experienced fewer problems with the .ai format than the .eps format.

Since we have to assume that the information in the .eps file you sent us, and how it opens in our graphics applications, is exactly what you want, and since we're not able to tell the difference, we cannot be held responsible for any "distortions" that might result in the finished mug decoration.

We might not be able to open and use any images that are embedded in other files. Hence all files that are to be used for the decoration of coffee mugs must be submitted in their original file format, either in the bitmap/raster or vector format. We cannot be responsible for mug decorations based on digital files sent to us that do not meet with these requirements. 

Vector File format we prefer: CorelDraw (version 11)
Raster/Bitmap formats we prefer: Photoshop and .tif

giftmugs by Bitmark, Inc.
4155 Dow Road, Suite X
Melbourne, FL 32934 - USA

Internet art only needs to have a resolution of 72 or 96 dpi's (dots per inch) as this is the standard resolution of the web. Digital files used for print reproductions should have a resolution of 300+ dpi's so that the result will be what you would expect - straight lines, minimal pixellation, no stair-steps.

Since almost all inexpensive and/or freely down-loaded clip-art from web sites, etc. etc. is raster/bitmap art, it cannot be up-sampled from the original 72 dpi's to, let's say, 300 dpi's, as the computer would not know where to take the "missing" pixels from to fill the void. Thus it just interpolates the "missing" pixels and the result is a high resolution image of a quality inferior to the original. Maybe the creators of these clip-art libraries make the resolution of their raster art only 72 dpi's (for most Mac's, and/or 96 dpi's for PC's) not only to save disk space but also to prevent that acceptable print reproductions can be made from their raster/bitmap art files.

It is interesting to note that high-resolution bitmap/raster files can be easily bought over the Internet but their cost is rather steep and to download them over the Internet with anything but a high-speed, broadband connection might be an exercise in futility.

Based on this, it is always good to prepare ones raster or bitmap art in a graphical program such as PhotoShop or PhotoPaint, save the created digital art with a resolution of at least 300 dpi's (but do not up-sample it!) in the .tif format and then send this to us.

Of course, high-resolution raster/bitmap files are very, very large in size and can, in most instances, NOT be attached to an e-mail. These files will always have to be uploaded directly to our FTP servers
- or better still mailed directly to us on a CD or DVD.

Note: Another benefit resulting from the use of vector files is that they are rather small and can be attached to an e-mail and can be converted to raster/bitmap files in not time at any desired resolution and size.

Please remember that the resolution-limitations/problems mentioned here DO NOT apply to digital art created in the vector format as vector art is resolution-independent and can be up-scaled or down-scaled without any problems.

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