You have probably heard this term many times before especially in the context of printing your digital photos. DPI is sometimes used as a measurement of digital photo printing quality while the truth is that DPI is an indicator of the printer quality.

DPI stands for Dots per Inch. DPI is a physical characteristic of a printer. Every printer prints dots that when put next to each other comprise a photo. Each dot has a physical size. DPI is also known as the maximum resolution that a printer is capable of. Low-end printers have lower DPI while high-end printers have higher DPI. DPI is defined as the number of dots a printer can print per inch. For example if a printer supports 1200 DPI it means that the printer can print 1200 dots per inch (on both X or Y axis). When printing it is important to make sure that the DPI is higher or equal to the number of pixels per inch in the source photo. If the DPI is lower the printer will not be able to fully display the high resolution photo. When the DPI is higher the printer will use multiple dots to represent one photo pixel. DPI is not relative to the page size. DPI is a fixed number for a given printer.

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You will have to find this one in your manual. In a nutshell if the human eye looks at a sheet of white paper in the morning it looks white because our eye adjusts to whit automatically but the camera will see the paper as having a blue cast.

If the same bit of paper was held up in front of our eye at lunchtime and again at sunset our eye still compensates and sees the paper as white but not so with the camera. So you can set your camera at “auto white balance” which takes an average only and is most of the time incorrect.

You can change to the little icons for “sun” “shade” “incandescent” “fluro” or “night” all of these are ok but nowhere as good as setting the exact white balance for the light you are in. Go to set white balance if your camera has it – say yes, then aim your camera at a piece of white paper filling the whole frame (you may have to turn of the auto focus) press the shutter release (like taking a photo) and it will be “set” just for where you are now – if you move to another area you would have to change is again.

It is important to note that when you set your white balance all the colours in your photo will be correct and without colour cast even if your subject is standing right next to a yellow wall.