Quote Originally Posted by MARK EG
What size do you make your centre circle for a 12"?

What size do you make your square for the cover?
12" centre circle = circle with diameter of 100mm
Outer sleeve/cover = 31.5cm

Also I remember seeing some label generating software on shareware.com - pretty sure it did all music formats like record/tape/cd/md etc.
I downloaded one for cd labels and covers. Basically do your artwork in whatever package you feel comfortable with (I like Paintshop and Photoshop personally) and then when you've got the image right, cut&paste it accross to your label creating software and it does the correct sizing for you.

Quote Originally Posted by MARK EG
What file format do you need to output the whole thing as, ready to go to print?
If you mean for taking to a repo-print house to have a bulk job done, nowadays they can usually deal with all formats like Jpeg, Gif and Tiff. Or a lot will now take files in the format of popular software (like cps and psp files). Tiff used to be the preferred standard though, so if you want to be safe go for this.
If you mean for printing at home, shouldn't matter, but if you are using Jpegs remember to set the compression ratio to 0% so you get maximum definition and highest resolution.