We use Mpx as an abbreviation because, in our experience, px is the most common abbreviation for pixels. Many camera manufacturers use megapixel resolution as the most important quality feature of their products, as it is the easiest quality feature to understand. It is by far not the most important thing now that almost every camera has enough resolution for normal use 12Mpx and up. Megapixels only become important if you want to display images on a larger medium or enlarged sections posters, large posters, professional photo presentations.
If we assume that the image should only be displayed on the Internet, we actually only need a very small number of megapixels, mainly because of the file size that should be as small as possible on the Internet. The images on this blog are displayed with a maximum width of pixels. So I reduce a large picture so that it is exactly pixels wide. The following picture has a resolution of x pixels and would only require a 0. But if we want to display a section of the image from above in the same quality x pixels , the original image must be a lot larger.
The original above of the following picture should have a camera resolution of 12 Mpx:. Now imagine that you take the same shot with a 24 megapixel camera. But be aware that cropping and adjusting your photos takes time. In fact, it takes a lot longer to edit photos than to take them in the first place. BOTTOM LINE : If you don't want to spend your time sitting in front of the computer editing and cropping your photos, then a camera with a ton of megapixels doesn't provide you with much of an advantage.
Let's conclude our introduction to megapixels with a quick summary of some of the reasons for and against getting a camera with more megapixels. Now that you know what they're about, get out there and define megapixels for others so they don't have to stay in the dark! Canon 6D Review.
Nikon D Review. Canon T4i D Review. How to Define Megapixels. Nikon Canon D vs. Zoom Maximum Aperture First vs. The memory card that comes with most cameras is a joke. It probably holds only about six or eight best-quality pictures. Pick either of the two highest-quality settings if you plan on printing your photos. Bite the bullet and buy a bigger one.
Just about every digital camera on earth saves photos as JPEG files. While there are a zillion graphical formats known to computer-kind, there are really only two, besides JPEG, that you, the digital photographer, need to know about.
Most digital cameras capture photos in the JPEG format. RAW format. Most digital cameras work like this: When you squeeze the shutter button, the camera studies the data picked up by its sensors.
For millions of people, the resulting picture quality is just fine, even terrific. But all that in-camera processing drives professional shutterbugs nuts. As a result, each RAW photo takes up much more space on your memory card. Most cameras take longer to store RAW photos on the card, too.
But for image-manipulation nerds, the beauty of RAW files is that once you open them up in a RAW-friendly image editing program, you can perform astounding acts of editing on them. You can actually change the lighting of the scene—retroactively!
Until recently, most people used a program like Photoshop or Photoshop Elements to do this kind of editing. But amazingly enough, humble, free programs like Picasa and EasyShare both covered starting in Chapter 5 , offer some RAW format capabilities. Not every camera offers an option to save your files in RAW format. Why are only some cameras compatible? This is because online viewing requires less resolution than physical printing.
The magic number for online viewing is 72 pixels per inch, as opposed to PPI for printing. So the resolution for online photos is less than a third of that required for print, which means that almost any modern-day camera will take images of sufficient quality for online viewing. As an example, one of the largest photo sizes you'll find on social media is the Facebook cover photo. Facebook recommends your image be pixels by pixels. Using our formula, that means we only need a camera that has 1.
This makes a smartphone perfectly capable of producing photos to use online. Photos that will primarily be used only in digital mediums have a lower megapixel requirement. As you've gathered by now, you don't actually need a huge amount of megapixels in order to post online or make small prints. However, a higher megapixel count can become much more useful when you start to crop into your photos.
Maybe the picture you took includes extra space around the subject that is not required, and you'd rather crop in tighter on the subject. For this reason, you'll want to have a significantly more megapixels at your disposal than the bare minimum.
Having excess megapixels provides more flexibility to crop your images while still retaining high picture quality. On the other hand, having too many megapixels can have some detrimental effects as well. One of the most common examples is in low light performance. At the beginning of this article we discussed the size of the pixels on your image sensor.
Remember we said that the larger the pixel, the better it can capture light. This means that, on two sensors of the same size, the sensor with less megapixels will by necessity have physically larger pixels than the sensor with more megapixels, and therefore will theoretically have better low light performance. As a result, the A7S II's much larger pixels provides that camera with superior low-light performance, at the expense of resolution.
The Sony A7 lineup contains a range of cameras that all have the same sensor size full frame but have quite different sensor resolutions megapixel count. But don't throw out all your high resolution cameras just yet. There are many other factors that can influence low light performance, such as image processor, type of sensor, and so on.
As such, it's not a guarantee that a lower resolution sensor will outperform a same-sized higher resolution sensor in low light, and in fact there are a great many exceptions to this rule. But it is something to keep in mind.
Another common issue with a high megapixel sensor is that more megapixels means that more data is stored, meaning the resulting pictures have larger file sizes. This means you'll have to plan for larger memory card capacities and hard drive space to store the same amount of photos.
While this may not be critical as the cost of storage continues to decrease, but suffice to say a happy snapper probably doesn't need every photo to be 50 MB in size!
After all these calculations and considerations, we still haven't answered how many megapixels you actually need. While these are rough guidelines and will vary from person to person, below we've outlined the megapixel requirements typically seen by each level of photographer. For the casual photographer or someone who's just starting out, bigger isn't always better in terms of megapixels.
You're most likely going to take your photos and upload them to your computer or device so you can share them. For prints, you're likely to print off standard 6x4 inch prints. If this is the case, you really don't need to be too concerned about the megapixel resolution of your camera. Most modern cameras fall somewhere between 16 MP and 60 MP, all of which are more than sufficient to meet your needs.
You should base your camera buying decisions on other features beyond sensor resolution. The enthusiast photographer goes beyond just happy snaps and tends to make efforts to continually learn more about photography and improve their skills.
As such, they are more likely to display their shots around their home, office or studio. This means they will want sufficient resolution in order to allow them to make larger prints. While in a pinch they also can likely get away with any current camera on the market, they may want to make a point to look at a camera with at least 20 - 25 MP of resolution in order to accommodate for the potential to crop their photos while still retaining enough information for larger prints.
Professional photographers don't only take pictures for personal use, they are also frequently delivering images to clients. The needs of these clients can vary wildly and they are more likely to require high resolution images in order to print in a variety of situations.
These may include wedding albums, fine art prints, or even magazine or billboard advertisements. The professional photographer needs to always be able to provide their clients with images of sufficient resolution to fill their needs, so they will want to err on the side of a higher resolution camera in order to ensure that.
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