The megapixel count is how many individual ‘dots’ are there on that image sensor, making up the photograph. 3 Megapixel cameras have 3 million dots on their sensors. 4 Megapixel cameras have 4 million dots . . . and so on.
You might assume then, that those extra million pixels will improve your digital photography. Not by much it won’t!
You would have to jump from a 3 megapixel to a 6 megapixel to really make a difference to your digital photography. (As compared to moving from 3MP to 4 MP... )
The reason I’m explaining this? When you are making your digital camera comparison, standing in the shop, ready to hand over your money – don’t concern yourself with whether camera ‘A’, has 1 million more pixels than camera ‘B’. It won't make a huge difference.
Other things to consider about the number of megapixels:
There are two things you should consider when making your digital camera comparison:
- How important is picture quality to you?
- How will you view your photographs, computer screen or print?
Picture quality:
This is determined by more than just the number of pixels. In fact, some cameras with a lot of megapixels produce worse pictures than cameras with fewer. The reason is twofold:
First, the more pixels crammed onto an image sensor, the smaller each individual pixel must be. The pixels are so small it’s difficult to accurately record the light hitting them. The results are what we call in digital photography ‘noise’ and ‘purple fringing’.
Second, the quality of lenses. The best sensor in the world will be useless without a good lens to focus light onto it. At the same time, a lesser sensor, but with a good lens in front of it is capable of taking very good photographs. Read about the importance of brand when making your digital camera comparison.
How will you view your photographs?:
If you plan to use digital photography to take photographs that you will only ever view on screen, then you won’t need many pixels. A standard 15” monitor will be 1024 pixels wide, and 768 pixels high. The total is only 0.8 Megapixels. No point buying a 6 megapixel camera if you only need 0.8 of them!
There are two things you should consider when making your digital camera comparison:
- How important is picture quality to you?
- How will you view your photographs, computer screen or print?
Picture quality:
This is determined by more than just the number of pixels. In fact, some cameras with a lot of megapixels produce worse pictures than cameras with fewer. The reason is twofold:
First, the more pixels crammed onto an image sensor, the smaller each individual pixel must be. The pixels are so small it’s difficult to accurately record the light hitting them. The results are what we call in digital photography ‘noise’ and ‘purple fringing’.
Second, the quality of lenses. The best sensor in the world will be useless without a good lens to focus light onto it. At the same time, a lesser sensor, but with a good lens in front of it is capable of taking very good photographs. Read about the importance of brand when making your digital camera comparison.
How will you view your photographs?:
If you plan to use digital photography to take photographs that you will only ever view on screen, then you won’t need many pixels. A standard 15” monitor will be 1024 pixels wide, and 768 pixels high. The total is only 0.8 Megapixels. No point buying a 6 megapixel camera if you only need 0.8 of them!
Maybe someday you'll want to print them out:
One day you may well decide to print the results of your digital photography. Most people do at some point, and therefore you’ll need to think carefully about the number of pixels when making your digital camera comparison.
The holy grail for printing is a resolution of 300 dots per inch. Click if you want to read more about image resolution. You will still get a good print from around 240 dots per inch though.
What does this mean for you in terms of megapixels? Have a look at the relationship below which shows how big a print you can realistically make:
MEGAPIXEL >>> QUALITY PRINT UPTO THIS SIZE
2MP >>> 6"*4"
3MP >>> 7"*5"
6MP >>> 10"*8"
8MP >>> 12"*10"
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