We are often asked " What is the best computer file format to send to a silk screen printer for imaging on a tee shirts?"   The Simplest answer is..... Any that can be viewed with out specific software! Let me explain.....   If you create your  "artwork" in a program like Microsoft Publisher, Word or Megasystems Monkeypics and the screen printer does not have that software, then they will not be able to open it. Use a common graphics file format like jpeg, gif, png etc. Here is more information on these  Graphics industry formats at Wikipedia  Computer graphics file formats.   Now, for the more difficult answer. Many people know that Personal computers are great for creating graphics, photographs and artwork, and want to use their PC  to create a custom image themselves, expecting that it can just be reproduced onto t-shirts and other products. Please be aware that the personal computer is just a tool used by artist and designers to create Professional graphics. And that most of the graphics you see on your computer and the internet are designed specifically for the computer monitor and NOT any other form of reproduction. this is due to many factors.   So, What am I saying?... Keep in mind that even seasoned Graphic designers rarely understand the limitations and  file structures used for the silk screen printing process. So Unless you are inexperienced knowledgeable  computer graphic designer, anything you do will most likely need to be re-created for Quality tee shirt printing.  "Does that mean I can't or shouldn't create my own art for t shirts?"         Absolutely not..... Just don't expect that a printer can take any file and reproduce it. I'm telling you this because many people spend thousands of hours on a file only to find out it is only good for viewing on a computer monitor. Most real graphics can only be viewed with the appropriate High end expensive Computer graphics software like Adobe Illustrator. then they are saved to a jpeg format so the client can see them. This is something to keep in mind because many clients get these jpeg ( Previews) from a professional and then assume that it can be sent off for professional printing.  " What about photographs I have that   I want printed onto t-shirt, hoodies and other apparel or garment?"   The easy quick answer to this without getting into to much techno babble is... ... ..... ......... Ok, Maybe there is none with out a little understanding of Digital imaging.  Digital photography and photographs digitized to be on a computer are comprised of many small squares of information called Pixels. The more pixels per square inch, the smaller the pixel is. What's this mean? Well, the smaller the pixel, the more the resolution or the finer the detail. Please see Wiki info. Now, with this in mind please remember that most digital cameras are designed to produce a 6X4 print. Thats pretty small for the front of even a small child's t-shirt. However, the screen printing process for textiles in the imprinted apparel industry uses a much lower resolution the say offset printing for cards and magazines. These means we can enlarge the photo some with out it getting to Pixelated or Blurry.  It is also good to know that jpegs ( Joint Photographer Expert Group) files are also Pixel based images. This means that if you computer file is High enough resolution it might be used. Keeping in mind that the color structure is always RGB or CMYK. Let me explain.  RGB or red, green blue refers to the three colors of the light emitting diodes of you monitor. More Wiki here.  These may have  very bright colors that only a neon ink can get close to reproducing. and the file  is ONLY for computer monitors , cell phones or TV's etc. Cmyk refers to the four colors used like those in your bubble jet printer. ( Cyan-Blue, Magneta-Red, Yellow and K for Black) these are the four primary colors and between them can miz to create orange, green, purple and brown. Then with a percentage of ink or inks they create tints and tones like Pink, gray and teal. see wiki. CMYK  Having said that, Understand that while screen printing can do four color process printing, it is difficult and expensive to do an so usually reserved for large quantity's of shirts with the same image. Also the screen print inks ( Plastisol) have a reduced Gamut.. See Wiki on color gamut      and are subject to color fading with time and laundering.  Most screen print art files use Spot color. This is where every color produces a separated film for each color of ink. and each individual color is printed onto the garment.  I hope this has answers you basic questions about  having your artwork printed onto apparel and sportswear with the screen print process. In my next blog I will cover computer file formats for Direct Digital printing on apparel. This uses a Bubble jet printer to print directly onto the garment. As well as heat transfers.  I will do another blog entry for graphic designers who understand the two types of computer graphics...... Vector also called Post script & Raster also called Bit-map. This will include such topics as Spot color, tertiary color, duo tone, halftone, traps, chokes, underlays, dot gain, moire patters, butt registration, flamingo printing, mezzo tint, tints VS. tones, negative positive images and much more.