According to local machines have the default size of it?

For example, 3M is a default or 8M of, 3M is not very clear, do not know if the laboratory is out of what? Paste it will be?

according to local machines have the default size

first look at how much you wash the size of photos, photos of the greater size, the greater demands of the pixels, the greater the pixel photos greater

5-inch X 222 pixels = 317 pixels

Qicun = 444 pixels X 317 pixels

1-inch 2.5 * 3.5cm 413 * 295
big card as 3.3 * 2.2 390 * 260
2-inch 3.5 * 5.3cm 626 * 413
small 2-inch (passport) 4.8 * 3.3cm 567 * 390
5-inch 5×3.5 12.7 * 8.9 1200×840 more than 1,000,000 pixels
6-inch 6×4 15.2 * 10.2 1440×960 more than 1,300,000 pixels
7-inch 7×5 17.8 * 12.7 1680×1200 more than 2,000,000 pixels
8-inch 8×6 20.3 * 15.2 1920×1440 more than 3,000,000 pixels
12-inch 12×10 30.5 * 20.3 2500×2000 More than 5,000,000 pixels
10-inch 10×8 25.4 * 20.3 2400×1920 more than 4,000,000 pixels
15-inch 15×10 38.1 * 25.4 3000×2000 600 megapixel
In addition, digital films do not control millions of pixels is, just look at the long edge Pixels, 1200 5-inch 6-inch
1400, 1700 7-inch

calculation is actually very simple:

200-megapixel digital camera, 1,920,000 effective pixels Maximum output of 1600 × 1200 photo

width:1600 Pixels/300 dpi = 5.3 “

high:1200 Pixels/300 dpi = 4″

In other words, if With print resolution of 300dpi output, processing up to 5.3 × 4-inch photos, and generally the size of photos is:

5-inch:5 × 3.5
6-inch:6 × 4

It is clear that 2,000,000 pixels to the effect of 300dpi print the largest 5-inch photos.

(Note:The human eye can tell the best resolution is 300dpi, over the resolution, human Eyes can not see the difference, that is to say 300dpi and 600dpi at a glance who is no difference, so now the largest printing equipment, the design of the output resolution is 300dpi, of course, everyone asked for the definition is not the same Generally speaking 200dpi will be able to achieve so that most people satisfied, so 2,000,000 pixels 6-inch photo print, it seems that most people are still clear.)

Sum up:As mentioned above, ” Print size “and the images are closely related to the resolution, as long as the resolution to change the image, the print size will change with, and the image pixel resolution and has a direct relationship, so the three can be converted.The most The pixel is simply a matter of fact, like 3M also washed out a clear ah, that is one thing.Magnification you can not wash it as this may increase rather fuzzy.