Written by: Digital Photography
The word pixel was created from the two words "picture element". From that they abbreviated taking the first few letters from "picture element" and it slowly became pixel.
Some of the more expensive cameras lets you to extend your exposure time even for few seconds (Sony 505V up to 8 sec).
That's cool, but when you actually try it, your image will be .... full of stars! Tiny little white dots, all over.
Similar to an array of buckets collecting rain water, digital sensors consist of an array of "pixels" collecting photons, the minute energy packets of which light consists.
Pixelstick consists of 198 full color RGB LEDs inside a lightweight aluminum housing. Pixelstick's brain, a small mounted box, reads images from an SD card and displays them, one line at a time. Each LED corresponds to a single pixel in the image.
"Pixels per inch" (PPI) is the more straightforward of the two terms. It describes just that: how many pixels an image contains per inch of distance (horizontally or vertically). PPI is also universal because it describes resolution in a way that doesn't vary from device to device.
Megapixels: Calculating the True cost of Resolution
Nothing excites camera buyers more than leaps in resolution. Like it or not, the eye-catching and revenue generating headlines are about mega-pixels. We all know that these high-tech new machines come with a big price tag.
Megapixels - An Explanation of Megapixels and How They Affect Photos
Camera manufacturers are fond of advertising cameras by the number of megapixels they have. But what exactly is a megapixel and how does it affect photos?
PPI (Pixels per inch)
An indication of resolution for digital pictures taken by a camera or scanned in.
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PPI (Pixels per inch)
Techniques Glossary PPI (Pixels per inch)
An indication of resolution for digital pictures taken by a camera or scanned in.
10 megapixels and up: The more advanced cameras tend to have image resolutions of 5 to 8 megapixels. Newer Digital SLRs can go up to 24 megapixels and you'd also expect their prices to go up too.
~ Per Inch
Normally you don't have to change the number of pixel's in an image to change the size of a printout. That task is handled by the software program you use to print the image.
~ are created when the light that flows through the camera lens is captured into a device called the camera
Image Sensor. The image sensor has millions of light capturing wells or cavities called photosites. Each of these ...
Hot ~ are individual ~ which look much brighter than they should. They are also called sparkles.
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More pixels, more problems. It's true that high megapixel cameras afford photographers the ability to capture huge amounts of detail and resolution, but they also carry with them some problems that their predecessors might not. Let's take a look at some of the issues.
If you only enjoy your photos on your computer screen, or uploading to a photo website to share with friends, you really only need a 1 megapixel camera. That is because your computer monitor is usually about 1000×1000 pixels = 1 megapixel! ...
A high MegaPixel count comes in handy when you want to crop pictures, and when you want to make enlargements. For uncropped 4x6 prints, 2 megapixels are usually enough, but for 5x7s and 8x6s, you kinda need to go up to 3 if you want a sharp picture.
How many megapixels do you need? First, determine how big you want to print your picture. Next multiply the number of inches by the desired ppi to calculate the total number of pixels needed. For example, let's say you want to make a typical 3 x 5-inch print: ...
Megabytes, Megapixels, JPEG Compression, and File Size Confusion
Isn't 100K a really small size for a photo for Your Best Shot? We explain
JPEG compression, from camera to computer monitor.
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It's Not Just Megapixels
Image quality in a digital camera is affected by much more than how many pixels fit its sensor
By Rob Sheppard ...
Open a file from such a cheap camera in Photoshop and upsample it to 6 megapixels so it will be the same size as one of our supposedly "good" images. What will our upsampled file look like?
When comparing digital cameras and their resolutions, it pays to be aware of the effective number of pixels, as often the total number of CCD pixels is quoted as an advertising ploy.
~ per centimeter (ppcm), ~ per inch (PPI) or pixel density is a measurement of the resolution of devices in various contexts: typically computer displays, image scanners, and digital camera image sensors.
A pixel is a contraction if the term PIcture ELement. Digital images are made up of small squares, just like a tile mosaic on your kitchen or bathroom wall.
~ mean quality for a digital photo frame
The ideal digital photo frame would display your images as clearly as a printed photograph. As this is nearly impossible, we recommend looking for the greatest number of pixels you can buy.
~. The small picture elements that make up a digital photograph.
Port. An electrical connection on the computer into which a cable can be plugged so the computer can communicate with another device such as a printer or modem.
~ per inch (PPI)
A measure of how much detail you see in your images.
~: Short for picture elements, the tilelike bits of color and tone that form a digital image.
Positive: Opposite of negative, used to describe any photographic image that reproduces the subject's original tones and/or colors. A slide is a positive; a print is a positive.
Effective pixels: Approx. 18.0 megapixels
4.3 µm square ...
apps do not remove the need for design. this article reduces design to pretty color and layout or the candy shell of a site or a thing. Web design.UX design.UCD design ... starts at the inception of the solution.
~ per inch (ppi). The number of pixels that can be displayed per inch, usually used to refer to pixel resolution from a scanned image or on a monitor.
Pixelization. An effect seen when you enlarge a digital image too much and the pixels become obvious.
Thousands of tiny dots make up a digital image. These small dots are known as ~. Each pixel contains information about the image’s color and light. ~ record and display information in the form of an image resolution.
-~ - abbreviation for picture elements. The tiny squares of light making up the picture are transmitted in digital form and reconstituted as a visual image.
(~ Per Inch) A measurement to describe the size of a printed image. The higher the number, the more detailed the print will be.
A small LCD display screen on the back of the camera used to compose or look at photographs. Also called Electronic Viewfinder.
Buying by only the megapixel rating will mean you will miss out on the other features of the camera - portability, accessories, a good quality flash, but it is one of the most important considerations.
Megapixels are only one aspect of the equation: sensors play a big part.
Since so many consumers don't understand megapixels, manufacturers often skimp to offer more of them.
Megapixels Come First
Once you decide you want or need a digital camera, the first issue you should address is megapixels (MP). A pixel is a single point on your screen or in your image. The number of ~ in an image determines how big you can make it without losing quality.
Megapixels - A Megapixel means ‘one million ~’ (see entry in our photograpgy dictionary). Thus a photo with a four Megapixel resolution (4MP) has four million ~ in it.
Megapixels and the largest printable image size: The amount of megapixels a digital camera has determines how large you can print the image. Therefore I've also mentioned below the largest image size each camera prints in ~.
On most website as well as a shop's shelves, cameras are lined up by their "megapixel" count. Megapixel simply means "million picture elements", or dots that make up the image.
Megapixels - Cameras with more megapixels give you the freedom to make huge prints and to crop your photos, but they do not necessarily have higher image quality.
~ per inch (PPI) or pixel density is a measurement of the resolution of devices in various contexts such as computer displays, image scanners or digital camera image sensors. Commonly mistaken for DPI or Dots Per Inch. See DPI ...
You would think that a 6MP camera would produce better images than a 5MP one but that is not always the case.
PPI (~ per inch) - Defines the quality of an image's resolution. Images on the Web require only a low resolution 72 to 86 ppi. A high quality photo would require a much greater resolution or higher ppi.
PPI (~ Per Inch)
The measurement of image resolution expressed in pixel density (or size) relative to inches. PPI can be used to calculate the final image size by dividing the image dimensions in ~, by the PPI. The resulting numbers would be expressed in inches.
One million ~ or more. The more ~ that exist in a image the higher the resolution and therefore the greater the quality of the image. Many new Kodak cameras are equipped with mega pixel sensors.
Also referred to as DPI (Dots per Inch), the higher the PPI, the higher the image quality of the final print.
If the kids digital camera has less than one megapixel expect to see some blurriness in the images....and they won't look very good printed out or developed at a photo shop. Remember to watch out for megapixels.
Bad CCD ~. There are a number of problems that can surface with ~ on the CCD of a DigiCam. Hot ~ are the most common, when the pixel lights up on a long exposure. Personally, I find this to be a non-issue.
24 Megapixels - is it too much?
Some people think 24 megapixels is a lot to cram onto an APS-C sized sensor. One thing for sure, that many megapixels may test the resolving power of some lenses. Diffraction will limit the resolving power also if you use smaller apertures.
Idealized ~ having perfectly defined characteristics and occupying no physical extent. The graphics equivalent of a mathematical point. Contrast with physical ~.
look-up table ...
~ in an image are usually square (i.e. the same width as height), and arranged in a rectangular grid.
The ~ in the histogram are heavily skewed to the far left.
This photo of a queen angel was initially taken with the white balance accidentally set on "fluorescent" (inset). In Photoshop, one simple click changed the white balance back to "daylight." ...
One mega-pixel is equal to a million points of light (or ~), the higher the mega-~, the higher the resolution of the digital image. This directly affects the size that an image can be enlarged, for example a 3.
megapixels Rube Goldberg Machine by 2D Photography Inc high speed flash photography Sharper Images Tips how to food photography backlight photography tips personal style photography Shutter Unit d90 vs d5100 Tips on taking care of a DSLR photography tutorials for beginners how to photographing ...
Megapixels: At this point, we recommend purchasing a camera that is capable of capturing images of three million ~ (that's three megapixels) or more.
Hot ~ occur because of charge leakage from individual ~ on your DSLR’s image sensor. Essentially, the sensor is electrically charged as the picture is taken and this charge can sometimes transfer from one pixel into another, causing it to brighten abnormally.
Millions of ~ (usually used in reference to the resolution of an image sensor).
Megapixels and Resolution
Perhaps the title of this tip should be titled "Megapixels and Clarity", because the term resolution is a bit misleading. Let me explain.
- From ~ to the Painted Brush Stroke: Using the new Mixer Brushes, Bristle Brushes, Wet Brushes and other new features in Adobe CS5 to create your own amazing masterpieces. This class was sponsored by Adobe and taught by Fay Sirkis.
1536 x 1024 ~ resolution
On our camera, the SQ2 pictures are perfect for e-mailing. The SQ1 pictures are good for printing at 5 x 7 inches, which is nice because you can get two pictures onto a single sheet of 8.5 x 11 paper.
How many ~ do you need? It all depends. This is like asking someone if they need a 35mm camera or a larger format. Different photographers have different needs. I use digital, 35mm, medium format and large format. I use different formats depending on the situation.
1 Megapixels will allow you to make big prints, other than that it confers no real advantage over models with lower pixel counts.
More megapixels doesn't mean better quality.
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It's time to blast away some preconceptions about image quality and pixel count on digital cameras.
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Another natural predator of expensive photographic equipment is the thief when you least expect it will swoop in and steal your gear away from you - leaving you feeling frustrated, violated and wondering what you did to deserve it.
Are 6 megapixels enough or do you need 12 or even 22 megapixels to take good photographs? Will you be comfortable with 3 manual modes or do you require endless menus and settings to be prepared for every possible scenario that may occur?
"How many ~ are enough?"
If you would like to hear my thoughts on this, then read my article on the difference in megapixels and find out what dams have to do with the answer! ...
PPI - ~ per inch, a measure of resolution.
PREFOCUS - The act of focusing a lens before taking a picture. Cameras equipped with autofocus can usually be prefocused by halfway depressing the shutter release button, which will also generally activate the exposure meter to take a reading.
PPI - ~ Per Inch - A measurement to describe the size of a printed image. The higher the number the more detailed the print will be.
Higher megapixels increase the resolution of the images but equally imporatnt is the quality of the individual ~. At the moment quality pixel equal bigger pixel size but this may change as new technology and new material for sensor chips are discovered in the future.
Describes the number of ~ stored in the image files made by a digital camera regardless of the number of ~ in the image sensor.
Noise - ~ in your digital image that were misinterpreted. Usually occurs when you shoot a long exposure (beyond 1/2-second) or when you use the higher ISO values from 400 or above. It appears as random groups of red, green or blue ~.
Now that the ~ have all those electrical charges, the work of processing those charges into meaningful information that can be used to create an image begins. Figure 2 shows a simplified flowchart of the raw process and subsequent processing.
Figure 1: Raw Process and Subsequent Processing.
The number of ~ determines how big you'll be able to print your photographs. Yes, it's true that the more ~ you have, the more refined detail your images will have, but at this stage, you want to start shooting as many photographs as you possibly can.
More megapixels results in better picture quality
False. The single most important factor to affect picture quality is the lens; the megapixel count only reflects the size of the image.
Resize To 800 ~
Now it's time to start getting your photo ready for DPC. The first thing to do (if necessary) is to flatten the image to speed up the operations that will follow. To do this, choose Layer > Flatten Image.
How many megapixels do you need? Because a digital camera's resolution is based on how many ~ its sensor contains, it would stand to reason that the more megapixels a camera has, the better the image quality and the larger the prints you can make.
PPI stands for ~ per inch and it measures pixel density which determines image resolution on displays, scanners and digital cameras.
fills adjacent ~ that are similar in color value to the ~ you click.
(ImageReady) lossless compression that uses a run-length compression scheme; supported by the TIFF file format in ImageReady only.
Balancing those ~.
A short video showing how to use the levels adjustment to control contrast.
Since all of the ~ in Canon's new system are used for phase detection, there's ample light for evaluation and there's no degradation in image quality.
If the majority of ~ are biased to the left and there’s a mountain touching its edge, the image will suffer from underexposure. Dial in PLUS compensation and retake the image. Check the histogram again.
The HD formats featured in Nikon cameras are HD: 1280x720 (720p, 24 fps or 30 fps) and Full HD: 1920×1080 ~ (1080i, 24 fps). (The \"p\" after 720 represent progressive scanning, where each line in the video is scanned in sequence.
In basic CCD imaging theory, for delivered optical system information not to be lost, the resolution of imaging CCD ~ must be at least twice as precise as the delivered resolution of the optical system (e.g.
The field mode provides poorer resolution because there are less ~ per picture. The FRAME MODE uses two tracks per image and allows 25 images to be stored on one floppy disk. The frame mode provides higher quality because more ~ per image are recorded.
Some are posted in resolutions up to 5,000 ~ or more per side: just keep clicking on the images. Rumored full site roll-out expected November 2000, but even today there are quite a few stunning images, especially considering that many of the comps were only scanned with a Mavica.
When an image is defined by many tiny dots, those dots are ~. A pixel represents the smallest graphic unit of measurement on a screen. The actual size of a pixel is screen-dependent, and varies according to the size of the screen and the resolution being used.
If we wanted to 'cool off' this image a bit, we could adjust the midtone slider of the BLUE channel histogram to the left to shift the blue ~ that are between 0 and 255 up (to the right) to higher tonal numbers. If necessary, we could also set a new white point on the blue histogram.
It is measured in ~. These are the individual elements that are like little tiles, that make up a digital image. The more of these ~ there are, the higher the resolution the picture has, and thus the more photographic the image will be.
These dots are called ~. CCDs are
usually described in pixel capacity, typically in millions of ~. Take the Nikon D100 for instance. The CCD can pick up 3000 ~ along the longest side and it can do this for 2000 rows.
But it is ideal to keep brush size small enough to cover just a few ~ inside and outside the selection for precision. Carefully paint over the edges of selection where it needs more work, Photoshop will re-sample newly painted area usually resulting in a much better and smoother selection.
Bigger sensors allow designers to not only add more ~, but also give each pixel more space. That means less interference from neighbouring ~ and less image noise. That’s most noticeable in low light conditions when high ISO settings are often required.
The mega pixel of the human eye is about 80 mega ~ but with eye movement, stereo vision, and brain processing the human eye produces about 500 mega ~. The mega pixel of the human eye is difficult to calculate because the eye moves almost constantly and this helps calculate the image.
With digital cameras, don't be taken in by the number of megapixels. A typical compact camera will show a decrease in image quality above 6 megapixels.
Be sure to compare a lot. There are lots of websites full of information, reviews and user experiences. Use this to your advantage.
Automatic focus works with a linear sensor that has several "~" that searches for contrast in the selected focus area. Why search for contrast? Because when an image is out of focus you can't find edges and contrast.
1 effective megapixels, with a pixel size of 8.45 x 8.45Âµm - 2.4 times larger than the ~ of the DX format image sensor used in the D2X camera. The actual size of the D3’s CMOS sensor is approx. 36.0 x 23.9mm - more than twice as large. Larger ~ can collect more light.
Every channel is a grayscale image of exactly the same size as the image and, consequently, consists of the same number of ~. Every pixel of this grayscale image can be regarded as a container which can be filled with a value ranging from 0 to 255.
It changes the ~ in the image and in many cases this is irreversible.
There are two major wars camera manufacturers are involved in: one is the megapixel war (a race to produce cameras with more megapixels packed in a sensor that went to a point of absurdity in some cases) and the other is the ISO control war.
See also: What is the meaning of Image, Pixel, Photograph, Digital, Camera?