Unfortunately, an image that is clear and sharp on a computer monitor may have jagged lines (“jaggies”) when screenprinted because screen resolution and print resolution are two completely different things. Monitors view at 72 pixels/inch and we print using artwork at a minimum of 300 pixels/inch.
So how does one go about making art ready for print that will be the proper size and resolution? Usually by using one of the following types of software.
1. Using a vector drawing program such as Adobe Illustrator or CorelDraw. These programs create art that is a collection of objects such as text and illustrations that can be scaled smaller or larger without degrading. The native file can be sent or the file can be exported or “saved as” a variety of formats that can be scaled or sized without loss of quality including PDF, EPS, and AI files. In addition the vector art can be exported to a raster (bitmap) file. Raster (bitmap) images cannot become vector art unless the art is traced or redrawn as separate objects and text.
2. Using a raster (bitmap) drawing program such as Adobe Photoshop, Corel PhotoPaint, Paint Shop Pro, or some other paint or photo editing software. The problem with image editing programs is that if the art is not created at the proper size and resolution at the beginning, it cannot be scaled larger later on without losing quality.
Unfortunately, these software packages are usually very expensive and have a steep learning curve for the average person who just needs to create simple art for print or online viewing purposes.
There are a couple of alternatives to the programs listed above that – in addition to being free – can allow you to create art and simple design that will print well.
Inkscape: A freeware open source scalable vector graphic drawing program:
Gimp: A freeware photo and graphics editing and creation program.
The secret to creating good art with these and other graphics programs is to start with a new document or canvas (also called an artboard) that is the proper size and resolution. For example: If you are making a sticker 2.75” x 2.75” then start with a canvas or artboard at 2.75” x 2.75” (and a resolution of 300 pixels inch if you are using a raster art program). Now you can add your graphic elements and text, then save or export the file in an acceptable file format. This is the basic method for creating art that doesn’t have art or elements that extend past the edge of the sticker (images with bleeds). Below I have outlined the technique for creating art with bleeds.
The way we create art that extends beyond the edge, or “bleeds”, is to start with a new canvas or artboard that is 1/8” larger on all four sides, i.e., add .25” to the finished vertical and horizontal measurement. Using the example above of a sticker with a finished size of 2.75” x 2.75” that has a bleed, then you would start with a new canvas or document that is 3” x 3”. Then, if the program allows it, set up guidelines on all four sides in from the edge 1/8” to show you where the sticker will be cut at, and another set of guides 1/8” in from the first guidelines to show the safety zone for text and critical elements.
Here is an example from a vector drawing program:

So the basic idea is to plan your work, then work your plan. Make your layout with guides, add graphics and text. Keep any critical text 1/8” away from the line(s) where the stickers will be trimmed. Export or Save As a vector file type such as EPS, PDF, AI, CDR or raster image such as TIF or JPG.
Below is a finished sticker design with an artwork bleed that is ready for export:

Here is what the finished, trimmed sticker would look like:

The same method listed above can be used in your raster image eding program also, but the only difference is starting with a canvas or new document at the finished size and 300 pixels / inch.
So with the available free tools listed above is is possible to properly set up your files yourself and have them ready for print without much trouble.
If you have any questions please don't hesitate to ask how we can help you help yourself and make the job of creating and designing artwork a little easier for you. You can always email me at ken@123stickers.com and I will try to answer questions as best I can.