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Topic: Image resolution


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In the News (Mon 23 Oct 17)

  
  Image resolution - Wikipedia, the free encyclopedia
For digital raster-images, the convention is to describe the image resolution with the set of two positive integer-numbers, where the first number is the number of pixel-columns (width) and the second is the number of pixel-rows (height).
In sampled images or other sampled data, the resolution should usually not exceed the sampling rate, or there will be aliasing.
Resolution can be a measurement of the total number of pixels displayed but this applies mainly to static images and can be affected by how it is displayed.
en.wikipedia.org /wiki/Image_resolution   (1621 words)

  
 Image Resolution
However, although the term is not effective, image resolution commonly is referred to in dots per inch (dpi)—dpi more appropriately is attributed to device resolution or output resolution, where the number of dots an output device is able to produce within an inch represents the resolution of the device.
Output resolution for computer-to-plate devices (i.e., platesetters) typically is about 2400dpi; however, because no significant visible improvement is realized when 2400ppi and 1200ppi monochrome images are compared, the range for monochrome image resolution is suggested as 900-1200ppi.
This recommended resolution, as well as ranges suggested for other file types, assumes that images have been scanned at the same size intended for print (e.g., the typical image width is approximately 20 picas, or 3 1/3 inches, for a single-column image that will appear in a double-column standard size publication).
dx.sheridan.com /advisor/image_resolution.html   (893 words)

  
 Resolution - Wikipedia, the free encyclopedia
Sensor resolution, the precision of a quantitative sensor.
Image resolution, the level of detail of an image.
Resolution Island (Galápagos Islands), in the novel Brown on Resolution by C.S. Forester.
en.wikipedia.org /wiki/Resolution   (231 words)

  
 Image resolution, file size, picture size and jpg compression
Resolution refers to the number of pixels in an image.
Resolution is sometimes identified by the width and height of the image as well as the total number of pixels in the image.
By using JPG compression, you can keep the physical size of the image the same and reduce the amount of disk space required to store it but you will be sacrificing the quality of the image.
www.microscope-microscope.org /imaging/image-resolution.htm   (1047 words)

  
 Printing & Image Resolution   (Site not responding. Last check: 2007-11-03)
Pixel dimensions are also used to indicate digital camera resolution and the resolution of different sensor arrays, usually expressed in terms of the total number of pixels captured.
It is worth remembering when resizing any image, that the number of pixels present in the original scan remains the same, regardless of changes to the overall output size of the image.
In reality, resolutions as low as 4 ppi would not produce a coherent image at this size, but these figures are easy to illustrate and the relationships demonstrated are the same at any resolution.
www.smls03494.pwp.blueyonder.co.uk /printing__image_resolution.htm   (1458 words)

  
 PixelEasy's Guide to Understanding Digital Camera Resolution   (Site not responding. Last check: 2007-11-03)
A digital image, just like the image you see on your computer monitor or television, is made up of multitudes of tiny dots called pixels.
The term "Resolution", when used to describe a digital camera, typically refers to the size of the digital image the camera produces, and is usually expressed in terms of "megapixels", which is equivalent to 1 million pixels.
The result is a larger image in terms of resolution, but one that now has much less clarity because you simply cannot produce something from nothing; the data was not on the original image and thus has been artificially created.
www.digicaminfo.com /resolution.htm   (844 words)

  
 Image resolution for the video monitor screen
Images are dimensioned in pixels, and screens are dimensioned in pixels, and these 500 pixels will fill 500 pixels on any screen, but those same 500 pixels will fill a different area in inches on different size screens.
It may have other embedded images filling areas on that paper page, which are resampled very small to fit their allotted space in the image of the full page we see on the screen.
It also means that when you want to evaluate your image critically, be sure to view the image at 100% Actual size (even if you must scroll around on it), so you are seeing the genuine image pixels that will print, and not a rough resampled temporary copy.
www.scantips.com /basics1c.html   (1390 words)

  
 sec1-2
Spatial resolution is usually determined by the sensor used to digitize the image or by the process used to create synthetic images.
Even though the resolution of this image is only twice as high as the 64 x 64 pixel image, it requires 16384 bytes to store (128 times 128 times 1), or four times the amount of space required for the 64 x 64 image.
Since digital images are usually two-dimensional, the processing loops of most image programs are basically two nested loops, one for the x dimension and one for the y dimension.
www-viz.tamu.edu /faculty/parke/ends489f00/notes/sec1_2.html   (1675 words)

  
 Pixels, images, and files
Considerable confusion arises because image size is specified by the number of pixels, the "resolution" in dots or pixels per inch (dpi or ppi), and the physical size (width and height).
A more accurate table, based the true image sharpness produced by the lens/camera combination, is presented in the introduction to Sharpness in Imatest.com.
When an image is sent to the printer, the image editor or printer driver resizes it to the printer's native resolution-- 720 dpi for Epson Photo printers; 600 dpi for HP and Canon.
www.normankoren.com /pixels_images.html#Pixels   (2319 words)

  
 Image Resolution for Color Printing
Images should be 300dpi at the final size in the layout.
For clear and crisp printing, images at their final size in the layout should be at 300dpi (dots per inch = squares of color in an inch) or 400dpi if the images include text.
The pixel dimensions of an image identify the resolution.
www.printingforless.com /creativepro/resolution.html   (1057 words)

  
 Understanding Digital Image Resolution
Digital images are comprised of pixels lined up side-by-side, both vertically and horizontally.
High resolution images are made up of more pixels than low resolution images (and thus result in better prints).
Cameras' maximum resolutions are usually clearly indicated on the packaging or even on the camera itself.
www.svca.org /articles/DigitalImageResolution.htm   (591 words)

  
 A Word on Image Resolution
Image resolution refers to the spacing of pixels in an image and is measured in pixels per inch, ppi, (sometimes called dots per inch, dpi).
Because the number of pixels in an image is fixed, increasing the size of an image decreases its resolution and decreasing its size increases its resolution.
Output resolution refers to the number of dots per inch (dpi) that the output device, such as a laser printer or imagesetter, produces.
www.ieee.org /organizations/pubs/magazines/imageres.htm   (370 words)

  
 Scanner Detail, R.N. Clark's Photography   (Site not responding. Last check: 2007-11-03)
Image quality and sharpness are critical if a photograph is going come close to the perception of "being there." The examples here illustrates what can be obtained at different scanning resolution and the difference in ultimate sharpness with film sizes.
After the images of the drum scans are scans of the 35mm slide on an HP Photosmart (the original SCSI model), a Nikon LS2000, and a Polaroid Sprintscan 4000.
The 35mm images here (both original field image and the image of the 30x39-inch print) were done on a Canon Elan with a Canon 28-105mm lens at f/11 on Fujichrome Velvia film using the camera's autofocus.
www.users.qwest.net /~rnclark/scandetail.htm   (4631 words)

  
 Image Resolution - Digital Art and Design
When you start a new image in a graphics program, you are asked to choose a resolution for your image.
But the image on the left has a resolution of 72 ppi and the image on the right has a resolution of 300 ppi.
The image on the left has a resolution of 72 pixels per inch or 72 marbles per inch.
www.bellaonline.com /ArticlesP/art21591.asp   (379 words)

  
 Resolution: Digital Imaging: Glossary: Learn: Digital Photography Review
A 5 megapixel image is typically 2,560 pixels wide and 1,920 pixels high and has a resolution of 4,915,200 pixels, rounded off to 5 million pixels.
Because the resolution is "normalized" to the picture height, the results of cameras with different aspect ratios can be compared easily.
The absolute number of (vertical) lines the camera is able to resolve along the horizontal axis (image width) is equal to the horizontal LPH multiplied by the aspect ratio.
www.dpreview.com /learn?/Glossary/Digital_Imaging/Resolution_01.htm   (834 words)

  
 Understanding resolution and MTF curves: introduction
It was obtained by photographing a chart (typically the USAF 1951 lens test chart) and looking for the highest resolution pattern where detail was visible.
The resolution of this film is rated as 60 lp/mm for 1.6:1 chart contrast and 140 lp/mm for 1000:1 chart contrast.
These equations are used in the page on Lens testing to calculate MTF from an image of a chart consisting of sine patterns of various frequencies, where the sine pattern contrast in the original chart is assumed to be constant with frequency.
www.normankoren.com /Tutorials/MTF.html   (3094 words)

  
 Re: image resolution limits
The fundamental limit of optical resolution is determined by the wavelength of light that is used to illuminate the object.
Also, the best optical instruments place their images at the eye's near point so that we can observe the greatest detail in these telescopic or microscopic images which are usually used to improve our eye's resolution through the process of magnification.
The aperture used for the images on the right side are about double the diameter of the aperture used to form the images on the left side.
www.madsci.org /posts/archives/may97/864446241.Ph.r.html   (2021 words)

  
 Digital Image NZ - Imaging Topics - Image Resolution   (Site not responding. Last check: 2007-11-03)
The main point to remember is that scanning resolution, measured in dpi, ppi or spi (dots, pixels or samples per inch) and printing resolution, expressed in dpi or lpi (lines per inch) are normally not the same.
This image could have come from scanning a 25 x 17 mm section of a 35 mm slide at 3000 dpi or from a 250 dpi scan of a 30 x 20 cm print.
You can either change the image size and the program calculates the new resolution, or you can input a resolution and the new image size is worked out for you.
www.digital-image.co.nz /DIT_Resolution.htm   (1037 words)

  
 Image Resolution and Print Size   (Site not responding. Last check: 2007-11-03)
Similar to the way that digital camera manufacturers have overstated their camera resolutions, they have also overstated the size of prints that can be made from their cameras.
According to the table, an image captured with a 1600x1200 digital camera printed at 200 lpi is indistinguishable from a real photograph in the 4.2" x 5.7" print size.
For example, on a 200 lpi printer, the difference between a 5x7 image from a 1600x1200 digicam and a real photograph would be barely noticeable.
megamyth.homestead.com /printsize.html   (397 words)

  
 Image Resolution, File Size and Download Speed
A file size is measured in kilobytes (KB), and resolution is measured in dots per inch (dpi), often referred to as ppi or pixels per inch.
High resolution scans provide a higher dpi and a more detailed image, but usually result in an impractical file size and slow loading speed.
Before scanning your image, you must set the correct resolution and scale (size of image).
coe.sdsu.edu /eet/Articles/wpdresolution/start.htm   (385 words)

  
 5. Image Sensors
However, there is a new challenger on the horizon, the CMOS image sensor that promises to eventually become the image sensor of choice in a large segment of the market.
Image sensors are manufactured in factories called wafer foundries or fabs where the tiny circuits and devices are etched onto silicon chips.
When an image has a different aspect ratio that the device it's displayed or printed on, it has to be cropped or resized to fit.
www.shortcourses.com /choosing/sensors/05.htm   (2731 words)

  
 Scale and Resolution in Image and Data Analysis
Image registration - the best spatial fit between two images of approximately the same scene, with various deformation models, and support for up to 2nd order interpolation of the fit.
Applications to Earth observation images, or other images taken with different detectors, with or without the same image resolution.
Image thinning: determine the morphological skeleton of a 2-level (fl and white) image.
astro.u-strasbg.fr /~fmurtagh/multires/doc/need.htm   (558 words)

  
 CafePress.com : Help Desk : Beginners Image Workshop
Resolution is how many dots in an inch, often referred to as DPI or "Dots Per Inch".
Resolution is the number of pixels in the horizontal direction by the number of pixels in the vertical direction.
The bigger the resolution, the bigger the image is. It will take more disk space, occupy more memory when loaded, and will take longer to be transferred through the Web.
www.cafepress.com /cp/info/help/images.aspx#template   (943 words)

  
 Resolution
Image quality is the primary concern for anyone taking a photograph.
A camera's ability to capture sharp images is referred to as camera resolution.
While the camera's job is to capture the image, the printer's job is to print the image on paper.
www.irphotoschool.com /lessons/c5050resol/c5050resol.php   (1882 words)

  
 Printer Resolution versus Image Resolution - Photo Tips @ Earthbound Light
As we saw last week, images made by digital cameras and scanners are comprised of tiny pixels.
In quoting printer resolutions that high, Epson, HP and other printer manufacturers are counting each and every one of those tiny ink droplets.
The image on the right really is a close-up of the image on the left.
www.earthboundlight.com /phototips/printer-resolution.html?source=rss   (886 words)

  
 Image Resolution Explained
An image with 640 pixels across the width and 480 pixels high has a resolution of 640x480.
Images viewed on a computer monitor are displayed at 72 dots per inch or dpi.
An image with 640x480 resolution will be displayed on a monitor as 640/72=8.9 inches by 480/72=6.7 inches, or 8.9 x 6.7 inches in size.
lakeshorecamera.com /index.asp?p=3791   (432 words)

  
 Gigapixel Images
Given that the resolving power of the human eye (under ideal conditions at the center of the retina) is about 1 arcminute (1/60th of one degree), this image captures considerably more detail than I (or any other normal sighted human) was able to see with my eye when standing on the overlook at Bryce Point.
The short answer is "why not?" As digital camera resolutions have increased, and the hardware, techniques and software for stitching multiple images into composites have improved, there has been speculation about when gigapixel images would become possible.
Another advantage to an image this size is the ability to crop very small portions of this image in a number of different ways and still produce extremely high resolution large prints.
www.tawbaware.com /maxlyons/gigapixel.htm   (1773 words)

  
 Reference Guide: Graphics Technical Options and Decisions
Images are displayed on a computer monitor as tiny dots, or pixels.
The number of pixels per inch is the image resolution.
This means that all images used for the Web should have an image resolution of 72 ppi.
www.devx.com /projectcool/Article/19997/0/page/6   (261 words)

  
 Catalog Page for PIA05421
The images that make up this composition were obtained from Cassini's vantage point beneath the ring plane with the narrow angle camera on June 21, 2004, at a distance of 6.4 million kilometers (4 million miles) from Saturn.
The image scale is 38 kilometers (23 miles) per pixel.
The brightest part of the rings, curving from the upper right to the lower left in the image, is the B ring.
photojournal.jpl.nasa.gov /catalog/PIA05421   (313 words)

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