Digital Photography and the Web
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By: Yusuf Badereldin Grade:9 11/12/14 Mrs. Pelto
This Powerpoint will breakdown how a digital camera takes pictures, how you resize images to use for your own purposes and how to save them for the web.
Digital Cameras: How they work ďƒ‘
A digital camera basically takes light and focuses it on the lens on to a sensor. The sensor is made up of a grid of tiny “photosites� that are sensitive to light. A Photosite is another name for a pixel, and these little pixels make up the picture. There are millions of pixels in just one picture.
This is how the digital camera works, light is absorbed and then imaged in flipped over onto the screen
Ratio and Megapixels
To start off, the megapixel is just millions of pixels. When taking a picture the file size is in megapixels. That is how much memory it is taking up on your camera. The ratio is just how much pixels it is for the height to the width. When taking a picture and you want to make the picture equal (in height and width) select “bicubic sharper” and the computer will automatically put them into a ratio. Here's an example:
Downloading Images ďƒ‘
Now you may be wondering, now that I’ve taken the picture how do I get that from the camera onto the computer. Well you have two ways. The 1st way is, most digital cameras come with a download cable so you connect the cable to the computer and to the camera and you can import the files from the camera. The second way is to check the back of the camera for the memory card and if your computer is up to date it will have a slot for you to put in the memory card and retrieve your files.
Best Practice (Sizing Images)
Best practice You should edit digital images to load quickly with a reasonable size before using on the web. Images should be less than 800 pixels wide or 700 pixels tall. Resolution should be 72. Also when taking images you should make sure the megapixels shouldn’t be on 20, 5 is good for an image.
While saving your images, there are certain things you should do before you try and post them onto the internet. The first thing is to check the resolution and make sure you used the “best practice” method. Second is rather than just using the “Save as” option select the “Save for Web” and the program you are using will optimize the image for the internet.
Preparing Images for the Internet
This is a screenshot of how the image looks when zoomed in to see the pixels.
Screenshots
All file names should be lower case. There should be 3 things included in the file name: What it is? When was it taken Who took it Also when naming digital images you should use dashes to prevent white spaces.
Naming Digital Images
Images
http://www.astropix.com/HTML/I _ASTROP/HOW.HTM http://moodle.expandthezone.com /pluginfile.php/267/mod_resource /content/1/digital-photographybasics.pdf http://photobucket.com/images/do wnload?page=1
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