Epson Stylus Series - Digital Cameras

Step 4: Data Input 18
Digital Photo Print Guide
Digital cameras
Digital camera data is expressed in the number of pixels (picture units).
You can check the number of pixels in the image properties in Windows Picture and Fax Viewer in
Windows XP.
Formula for print size and number of pixels (When the resolution of the image data is 360 dpi)
Number of pixels suitable for the output size <Horizontal (vertical)> = Output size <Horizontal
(vertical)> (mm) × 360 (dpi) ÷ 25.4 (mm)
Suitable print size <Horizontal (vertical)> (mm) = Number of pixels <Horizontal (vertical)> (mm) ÷ 360
(dpi) × 25.4 (mm)
Example
A. With an A4 (210 × 297 mm) print
Horizontal (Long side) : 297 × 360 ÷ 25.4 = About 4,209 pixels
Vertical (Short side) : 210 × 360 ÷ 25.4 = About 2,976 pixels
If you print on A4 size at 360 dpi, data with about 12,600,000 pixels (4,209 × 2,976 = 12,525,984 pixels) is
necessary.
B. With 6,000,000 (3,008 × 2,000) pixel data
Horizontal (Long side) : 3,008 ÷ 360 × 25.4 = About 212 (mm)
Vertical (Short side) : 2,000 ÷ 360 × 25.4 = About 141 (mm)
With 6,000,000 pixels, you can print at 360 dpi on 212 × 141 mm paper.
The number of pixels is shown as an approximate figure because the actual image size may differ
depending on the digital camera manufacturer and the aspect ratio (the vertical and horizontal ratio of
the image). The resolution is calculated from the number of pixels on the long side of the image and the
size of the long side of the paper.
Pixels Print Size
4 × 6"
(100 × 150
mm)
5 × 7"
(130 × 180
mm)
8 × 10"
(203 × 254
mm)
A4 (210 ×
297 mm)
10 × 12"
(254 × 305
mm)
A3 (297 ×
420 mm)
13 × 19"
(329 × 483
mm)
5 million pixels
(2736×1824
pixel)
463 dpi 386 dpi 274 dpi 234 dpi 228 dpi 165 dpi 144 dpi
6 million pixels
(3008×2000
pixel)
509 dpi 424 dpi 300 dpi 257 dpi 251 dpi 182 dpi 158 dpi
8 million pixels
(3488×2320
pixel)
590 dpi 492 dpi 349 dpi 298 dpi 290 dpi 211 dpi 183 dpi
10 million pixels
(3872×2592
pixel)
656 dpi 546 dpi 387 dpi 331 dpi 322 dpi 234 dpi 204 dpi
12 million pixels
(4288×2848
pixel)
726 dpi 605 dpi 428 dpi 366 dpi 357 dpi 259 dpi 225 dpi
14 million pixels
(4608×3072
pixel)
780 dpi 650 dpi 461 dpi 394 dpi 384 dpi 279 dpi 242 dpi