I would avoid using jpeg as much as possible though - jpeg files are lossy, which means they lose image data when you save them (even high resolution). If you're saving something you're working on in a raster (non-vector) format, you should use a lossless format (one that does notlose any image data) such as PNG or TIFF.
Vector is the norm for slik screening because it is not resolution dependent and can be easily color seperated. The screen printers I deal with will not accept jpg files only vector files. If they do accept them you will most likely be hit with some kind of art charge to vectorize the file.
If the resolution is high enough (e.g. 300dpi), I think many printers will still accept it without additional charge. Of course, this WILL vary from printer to printer, so make sure you know what your printer needs before making the artwork. Or, conversely, find a printer than can print your already make artwork without extra fees
If the file is vector kkeep it vector. If it is a rster image try to keep it in the native format of the raster program.
If your image is vector and you print to PDF it should still be vector only in a pdf file. Keep it that way. You printer can either open in Corel or Illy as a vector file or into Photoshop as a raster file.
Great feedback, thanks! The issue really is that the printer uses jpeg files from which to print. I have looked at the printer's end product and the quality of its t-shirt printing and design work look good.
So if I need to create a jpeg from my illustrator files, what might you suggest?
I dont use Illy but either export or save as JPEG at the print size. Keep the resolution @ no smaller than 300dpi. You will need to zip or stufit (compress)the file as it will be huge. That should do it.
Your printer specifically uses jpeg?? That sounds really odd. Standard raster formats for this sort of printing are going to be ones where there is no loss of data - tiff for example, or program-specific ones like psd. A jpeg saved at high quality will probably not look much different, but there is really no reason for a printer not to be able to accept at least some form of lossless file format. Personally I like png, as it'll give the smallest file sizes for raster-based lossless generally.
Most imaging programs do let you save as a variety of formats, but a handy program you might still check out is Irfanview. This freeware program can convert between tons of different formats, lets you adjust jpeg quality with saving, and does a few other useful things.
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