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An error occurred while saving the commentWill Brashear commented
it is not only pngs but anything you export. If you have a picture over the artboard and it is not over the entire bleed setting you get white lines down the bleed area as well.
Todd, the point of bleeds is so when we send the files to the printer, the color will bleed over so they can be ganged up on the large format printers. This enables the printers to have a variable width and height in case the paper expands.
Without the bleeds, we wait for money because the printers have to reprint until they look perfect. So doing as you say means we got to set up two different documents for every document we need to go to a printer or put it out on the web.