FILE FORMAT GUIDELINE
GUIDE TO IMAGE RESOLUTION
FILE PREPARATION CHECKLIST
STANDARD POSTER SIZES
When presenting your company's logo to potential customers,
you can't afford to have it reproduced incorrectly. Faulty
reproduction of your logo could cost you time, money,
potential customers, even your reputation.
At DPI Signs we understand the time it takes to build
your company's image and profile. With the utmost attention
to detail, we will reproduce your corporate logo or graphic.
Allow us the opportunity to transform your logo into an eye
catching, custom graphic and signage to professionally
communicate your message to the world.
We also offer the service of doing the graphic design for
you. We charge R250/hour for design time. We have the
experience in doing the design of thousands of posters,
signs, and trade show displays. We also have the ability to
scan photos at high resolution.
Consult with DPI Signs to learn how to best prepare
your own files for precise reproduction.
FILE FORMAT GUIDE
files are accepted in the following formats:
- Adobe Illustrator drawing or vector graphics file
- Encapsulated postscript image file created using Adobe
Illustrator; designed for high resolution printing of
illustrations; standard file format for importing and
exporting PostScript files
- Corel Draw Vector drawing file
- Tag Image File Format; preferred bitmap graphics format
for high-resolution postscript printing
.jpg or .jpeg
- standard format for photographic image compression
developed by the Joint Photographic Experts Group
- Bitmap file created using Adobe Photoshop
- Portable Document File from Adobe Acrobat
.fh11 – Macromedia Freehand
Quick Facts about Bitmap Images
Bitmap images are made up of colored dots (pixels) in a grid
Also known as raster images
Resolution dependent – resizing affects image quality
Scanned images and digital photos are bitmaps
Quick Facts about Vector Images
Vector Images are made up of individual objects composed of
lines and shapes with different attributes such as color.
Resolution Independent – scaling images does not affect
Smaller file size
Not suitable for photo-realistic reproduction
Fonts are vector objects
GUIDE TO IMAGE
refers to the number of colored dots or pixels that make up
It is commonly expressed in dpi or dots per
The higher the dpi, the greater the resolution, the better
the image quality. But don’t go overboard. Higher resolution
images create larger file size.
Image resolution is directly and inversely proportional to
an image’s physical size. When you increase the resolution
of an image, reduce its size. When you enlarge an image,
lower the resolution. Otherwise, the image will print
For printed images, the ideal resolution is 300 dpi
for images and 400 dpi for text at the final printed
More Helpful Tips:
Your screen resolution doesn’t accurately reflect your image
resolution because monitor displays usually have about 72 to
116 ppi. To view print resolution of your image, zoom in up
When taking pictures from a digital camera for your print
project, it’s best to set your camera to the highest
Four-Color Process Printing uses the CMYK color mode.
Convert RGB images to CMYK using graphics editing software
such as Adobe Photoshop.
Save your images in a lossless file format such as .tif
and .eps to maintain accuracy and quality.
Please follow this guide to reduce potential problems,
additional costs and speed up production and delivery
Scanning resolution is usually twice the output line screen.
A resolution of 300 dpi or close is ideal when scanning
color and grey scale materials. B/W art should be scanned
not higher than 600 dpi. Text should be at 400 dpi. Always
scan at 100% of the final size of your document.
2. COLOR MODES
No RGB images. RGB is used for viewing images on a monitor.
Please convert to and save all your images in CMYK mode.
Your images will not output properly if your files are not
set up in CMYK.
Please spell-check your document and review all other
information carefully before submitting your files to us to
4. IMAGE FILES
Please submit all image and graphic files used in your
Include the original copies of each graphic file.
Include all supporting files used in the document
Send the linked file of “placed images” in Macromedia
Do not embed image files into your layout
Please submit your files with all the necessary fonts
included – both screen & printer fonts used in your
6. PRINT GUIDE
Please send us a mock-up or dummy of your job to serve as a
7. CONTACT INFORMATION
All files and medium sent to us should have client’s
complete name and contact information.
STANDARD POSTER SIZES