Photography Information

Why 1.5 Megapixels is Enough


Dots Per Inch is a useful measure of relative resolution. But if you don't know the image size in inches or some other measure of size, then the amount of dots per inch doesn't mean much. That's why DPI is used in conjunction with scanner Specifications, because you know that the size is going to be 3.8 by 1.7 inches!

Different resolutions are used for different purposes. 72 or 75 DPI for screen viewing; 250 for digital photography and 300 dpi for printing. See how this is a nice comparison, yes, you can get away with 50 less pixels per inch in your photographs than would be required for A4 printing, this is because of the physical size of the photo!

Dots Per Inch specifies how much information is resolved in a picture, whereas the number of megapixels is usually used to describe the total output size (in pixels) of an image.

Example: I want to reproduce the standard photograph size. This would be 6 by 4 inches. Digital photography requires a minimum of only about 250dpi, So: 6 * 250 = 1500 and 4 * 250 = 1000, so you need an image sized about 1500 * 1000 pixels (about 1.5 megapixels). Thus you can get a perfectly good standard print from a 1.5 megapixel camera!

If you take a photo twice, one at 5 and the other at 1.5 megapixels, than ask your self which one looks "better"? They will both look reasonable because your computer generates colours such that the image looks better than it really is; if you were to print both as a 6 by 4 image, they will look identical, because your printer can't generate more than 300 dpi so the "better" image is effectively reduced in quality anyway. This example demonstrates how it is possible to literally waste memory, ie for everyday use the additional memory required for the other 4 megapixcels gives you no real benefit!

This is quite good because a 36 Megabyte media card can store 50 to 65 images at 1.3 megapixcels but only 8 to 10 at 5 megapixcels, so unless you are planning on getting your images printed larger than 6 by 4 there's no real advantage to the full 5 megapixcels.

Now we have established that a 1.5 megapixel camera will produce a 6 by 4 inch standard photograph, that is, it will generate a resolution such that each pixel is simply reproduced "as is", we come to the more interesting issue of enlargement.

If you wanted to print your 6 by 4 inch image as a 10 by 8 photo (which would normally need the full 5 megapixels), there would not be a sufficient number of pixels for the additional surface area, so we now need to scale up the existing pixels by "resampling" the existing pixels, a process which estimates how the "missing" pixels should appear, and fills them with the appropriate "colour". A 25% resample

I am the website administrator of the Wandle industrial museum (http://www.wandle.org). Established in 1983 by local people to ensure that the history of the valley was no longer neglected but enhanced awareness its heritage for the use and benefits of the community.


MORE RESOURCES:
This RSS feed URL is deprecated, please update. New URLs can be found in the footers at https://news.google.com/news


Forbes

A Coffee Table Book Elevates Hotel Photography To A New Level
Forbes
Tony Duran is a photographer known for his beguiling pictures of celebrities including Jennifer Lopez, Beyoncé, Brad Pitt and many more. Several years ago he shot Christian Slater for People magazine at dana hotel and spa in Chicago. Gene Kornota ...



NPR

Global Photos From The 2018 iPhone Photography Awards Contest ...
NPR
It's a haunting image. At dusk, hundreds of Rohingya refugees at a camp in Bangladesh are huddled around a projector, looking at something just outside the ...
2018 iPhone Photography Awards celebrate the emergence of an ...New Atlas

all 3 news articles »


Wall Street Journal

'African American Portraits: Photographs From the 1940s and 1950s' Review: Depictions Free From Bias
Wall Street Journal
Baldwin would surely have been pleased by the images in a new show at the Metropolitan Museum of Art: “African American Portraits: Photographs From the 1940s and 1950s,” organized by Met photography curator Jeff L. Rosenheim. Far from demeaning ...



Digital Trends

The top-selling digital photography book can be yours for free now
Digital Trends
The Northrups have been posting regular photography videos on YouTube for the last six years, and have built up a solid fan base over that time. The channel covers a variety of subject matter that includes photo tips, camera reviews, and software guides.



Pagosa Springs Sun

Pagosa Springs Photography Club announces contest
Pagosa Springs Sun
1 and will be judged by two independent professional photographers. Awards will be presented at the PSPC awards party, which will be held on Sept. 12 at 6 p.m. at the PLPOA Clubhouse, 230 Port Ave. All entries will be displayed at the awards party.



Digital Trends

A top-selling digital photography book can be yours for free now
Digital Trends
Free photography book, anyone? And it's not just any old book. How To Create Stunning Digital Photography is the work of popular photography vloggers Tony and Chelsea Northrup, and the publication currently sits at number one in Amazon's digital ...



HuffPost

The 2018 iPhone Photography Awards Prove You Don't Need A Fancy Camera To Take Amazing Photos
HuffPost
Ever since the release of the first iPhone, the iPhone Photography Awards have honored the true masters of mobile photography. Now in its 11th year, we're seeing just what some photographers can do with a camera they probably carry around all the time.
Winning images from the 2018 iPhone Photography awards ...Australian Photography + digital

all 13 news articles »


Neowin

Pay What You Want, or beat the average for this Professional Photography Bundle
Neowin
Today's highlighted offer comes via our Online Courses section of the Neowin Deals store, where for only a limited time you can Pay What You Want for the Complete Photography Bundle. Master essential photography and editing skills with 26.5 hours of ...




iMore (press release) (blog)

iPhone Photography Awards 2018 | iMore
iMore (press release) (blog)
Thousands of people entered the iPhone Photography Awards contest. There a dozens of stunning pictures: but here are the winners, and how to enter next ...
Winning Imagery from the iPhone Photography Awards 2018Cool Hunting
2018 iPhone Photography Awards winners include the SEPhone Arena

all 6 news articles »

Google News

home | site map | Seashell Photography
© 2006