Resolution is a numerical value that shows how beautiful (elaborated, or dense) an image appears.
The unit of resolution is called “dpi” (abbreviation of Dot Per Inch), and this unit indicates how many dots are in a box of 1 inch in width.
Therefore, this means the larger the value becomes, the more beautiful (denser) the image gets.
In the case of EOS Kiss X4 cameras, you can take pictures of 5184×3456 pixels.
If you print out this image with 350 dpi that is used for most printings in Japan, its size becomes 37.62×25.08cm.
This is a size a little smaller than the A3 size.
(*Letter sizes may be a little different in you country, so please check it out.)
And, if you print out that image with 72 dpi, its size becomes 182.88×121.92cm.
Here is how to calculate the value:
Print’s size (cm) = Number of pixels ÷ dpi × 2.54
The print’s size itself becomes larger if you print it out with 72 dpi, but the quality is too low to see as a photo.
You might have seen fuzzy pictures like this one on a photo when you printed out an image on a website or something.
This is because images used on websites are set to 72 dpi most of the time.
Meanwhile, images on magazines or advertisements around us appear quite fine. This is because those are printed out with 350 dpi, and this difference comes from the differences of resolutions.
When trying to print out images you shot on a printer, please pay much attention to how resolution works.
You might be able to print images beautiful that you printed out in the past with some settings of your printer.
Besides, PIXTA recommends uploading images with 350 dpi.