The 7 megapixel camera what advantages?

Recently, the compact digital cameras have also introduced a 700 MB contributory. However, I think the 7 megapixels is too high, it seems unnecessary. I ask, what are the advantages the 7 megapixels? now even small and lightweight digital cameras also took 700 megapixel era. However, as you ask, the 7 megapixels really necessary? pixels less digital camera prices also phase

Recently, the compact digital cameras have also introduced a 700 MB contributory.

However, I think the 7 megapixels is too high, it seems unnecessary. I ask, what are the advantages the 7 megapixels?

Now even small and lightweight digital cameras also took 700 megapixel era.

However, as you ask, the 7 megapixels really necessary? pixels less digital camera price is the lower. "Can reduce pixels, so that the camera cheaper"--If you think it is also understandable. Next, we'll take a look at 700 m pixel image at what time can come in handy.

The number of pixels by impact print size.

High-megapixel digital camera capable of shooting image size larger photos. The larger the image size, you can print to the larger sizes of paper. Even if it is part of the image cropped down to print, can be printed as a fine result. However, it was generally believed that "for L-size paper, 130 megapixel image is sufficient". This is why?

Print fine effect depends on the "DPI (dots per inch)" this index.

For a printer, it represents the "many points can be printed. The higher the number the more precise printing results. In General, more than the prints precision 300dpi, basically there is no problem. As for the latest inkjet printer, as long as we can get enough 200dpi pretty print effects.

Calculation of the desired image size

Here, we calculate to 200dpi print the desired image size.

The calculation formula is 【 the image dimensions (width/height) 】 = 【 print size (width/height) cm 】 ÷ 【 2.54 】 × 【 dpi 】. The reason is that by dividing 2.54 will be carried out with the cm units in inches (1 inch = 2.54cm). The data to be substituted into the formula, you will come to 200dpi in L-size paper (12.7 × 8.9cm) when printing on the desired image size is 1000 x 701 pixels. Due to the mega-image resolution is 1280 × 960 pixels, so that "L size, 130 Megapixels is enough". So, if you are A4 size (29.7 × 21cm) print? use the same calculation to know that you want to print need 200dpi 2339 x 1654 pixels. In this way, 400 megapixel image is sufficient. Therefore, the 7 megapixels (3072 × 2304), nature is a bit high.

7 megapixels-big size images can play a role of occasions is part of the image to be enlarged print.

Please see the following figure. 7 megapixels, respectively, preparing and 400 megapixel 2 images that will cut out the middle section, the print to the printer paper size L. If you are cut out 700 megapixels, the component is unable to print, the effect 200dpi is very beautiful. And 400 pixel image can be printed, 200dpi following effects seem a bit rough. Collective license and cannot zoom shot, hope will be a part of the image to enlarge the print, the 7 megapixels you can come in handy.

The Conference will be a part of the image down to print, the more pixels, the better the effect

Ready to 700 megapixels and 400 megapixel 2 images, respectively the intermediate dog Photo CD down after printing to L size paper.

From 700 megapixel image on the CD off to 200dpi granularity print to L size paper, so the effect was very good. But megapixels, as the resolution is insufficient, the printed results becomes rough.