Why printers still ask for EPS
EPS (Encapsulated PostScript) has been a print-industry standard for decades. Flex and banner printers, newspaper advert desks, signage shops and some older layout programs such as QuarkXPress and older CorelDRAW versions still request artwork as EPS, even when the artwork is a photo.
What happens when you convert
Each JPEG is opened in your browser and stored inside an EPS file as a high-quality JPEG image with a PostScript wrapper that print software understands. The image keeps its full pixel size, and the file header records its dimensions. Each JPEG becomes its own EPS file.
Raster EPS, not vector
The EPS contains your photo as pixels. It is not traced into vector shapes, so it prints well at its natural size but becomes soft if enlarged far beyond it. For a sharp result on large banners, start with the highest-resolution photo you have — roughly 100–150 pixels per inch of final print size is a common minimum for banners viewed from a distance.
Common problems and how to fix them
The printer says colours look different: the EPS is in RGB; printers working in CMYK convert it, so request a proof. The print is blurry: the original photo is too small for the print size. The printer wants an editable logo: convert logos with Image to SVG instead.
Good habits
Ask the printer for their exact file requirements first, send the largest original photo you have, and keep the JPEG as your master copy.