What size is a 0.3 megapixel image?

Instead of popping in rolls of film, you use a memory card&#;a wafer thin sliver of reusable storage&#;to store your photos on a digital camera. The memory card that comes with most cameras is a joke. It probably holds only about six or eight best-quality pictures. It&#;s nothing more than a cost-saving placeholder, foisted on you by a camera company that knows full well that you have to go buy a bigger one. When you&#;re shopping for a camera, it&#;s imperative to factor in the cost of a bigger card.

For more information, please visit 0.3 Mpixel.

Most cameras come with three picture quality settings: draft, normal, and best quality (or, in the Starbucks-speak you&#;ll often see in the camera&#;s manual: normal, fine, and super-fine). Pick either of the two highest-quality settings if you plan on printing your photos.

It&#;s impossible to overstate how glorious it is to have a huge memory card in your camera (or several smaller ones in your camera bag). Since you&#;re not constantly worrying about running out of space on your memory card, you can shoot more freely, increasing your chances of getting great pictures. You can go on longer trips without dragging a laptop along, too, because you don&#;t have to run back to your hotel room every three hours to offload your latest pictures. Your camera&#;s battery life is more than enough to worry about: The last thing you need is another chronic headache in the form of your memory card. Bite the bullet and buy a bigger one.

UP TO SPEEDThe File Format Factor

Just about every digital camera on earth saves photos as JPEG files. JPEG is the world&#;s most popular photo file format, because even though it&#;s compressed to occupy a lot less space, the visual quality is still very high.

But JPEGs aren&#;t the only format you&#;ll run across, especially once you start editing your photos, which is covered in Part 3 of this book. 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.

TIFF. Most digital cameras capture photos in the JPEG format. Some cameras, though, offer you the chance to leave your photos uncompressed on the camera, in what&#;s called TIFF format. These files are huge&#;in fact, you&#;ll be lucky if you can fit one TIFF file on the memory card that came with the camera.

TIFF&#;s advantage is that these files retain 100 percent of the picture&#;s original quality. Note, however, that the instant you edit a TIFF-format photo, most image editing programs convert the file to the lesser quality JPEG format. That&#;s fine if you plan to order prints or a photo book. But if you took that once-in-a-lifetime, priceless shot as a TIFF file, don&#;t do any editing&#;don&#;t even rotate it&#;if you hope to maintain its perfect, pristine quality. Instead, make a copy of the file and use that copy when it&#;s time to edit. Then hang onto the TIFF so you&#;ll always have a master version of your original shot.

RAW format. Most digital cameras work like this: When you squeeze the shutter button, the camera studies the data picked up by its sensors. The circuitry then makes decisions pertaining to sharpening level, contrast and saturation settings, color &#;temperature,&#; white balance, and so on&#;and then saves the resulting processed image as a compressed JPEG file on your memory card.

For millions of people, the resulting picture quality is just fine, even terrific. But all that in-camera processing drives professional shutterbugs nuts.

They&#;d much rather preserve every last iota of original picture information, no matter how huge the resulting file on the memory card&#;and then process the file by hand once it&#;s been safely transferred onto the PC, using a program like Photoshop Elements (coverage begins starting in Chapter 8). That&#;s the idea behind the RAW file format, which is an option in many pricier digital cameras. (RAW stands for nothing in particular, and it&#;s usually written in all capital letters like that just to denote how imposing and important serious photographers think it is.)

A RAW image isn&#;t processed at all; it&#;s a complete record of all the data passed along by the camera&#;s sensors. As a result, each RAW photo takes up much more space on your memory card. For example, on a 6-megapixel camera, a JPEG photo is around 2 MB, but over 8 MB when saved as a RAW file. 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! And you don&#;t lose a single speck of image quality along the way.

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? Because RAW is a concept, not a file format. Each camera company stores its photo data in a different way, so in fact, there are dozens of different file formats in the RAW world. Programs like Elements must be upgraded periodically to accommodate new camera models&#; emerging flavors of RAW.

If you want to learn more, please visit our website High-resolution camera module.

A Megapixel is simply a unit of graphic resolution equivalent to one million. Or more precisely 1,048,576 (220) pixels. Megapixels are often used in marketing new camera sales because people always assume bigger is better. It's good for sales!

That said, if you have a photo and you want to figure out the Megapixel count of that image this is what you have to do. Simple multiply the resolution of the image then divide by 1 million.

For example this photo iPhone 6 Plus sample photo by Flickr user Janitors is 8 Megapixels at full resolution however when embedded below (on this webpage it's only 0.3 Megapixel)

(620x465 ~0.3 Megapixel)

So if your photo has this resolution:
x

Do the following simple calculation:
x = 7,990,272

7,990,272 / 1,000,000 = 7.

So this image would basically be 8 Megapixels or 8MP. As a general rule you just round up or down accordingly.

x 768 =
0.7 Megapixel

x =
2 Megapixel

x =
3 Megapixel

x =
8 Megapixel

Here is a table of some common resolutions from 1 to 100 Megapixels.

If you want to determine how large you can print certain photos? Check this page.

More photography resources.

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