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Information Technology

Information Technology . Images: Types, Resolution and Techniques . Digital Image Resolution Refers to the number of distinct pixels that can be displayed.

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Information Technology

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  1. Information Technology Images: Types, Resolution and Techniques

  2. Digital Image Resolution • Refers to the number of distinct pixels that can be displayed. • The term "Resolution", when used to describe a digital camera refers to the size of the digital image the camera produces, and is usually expressed in terms of "megapixels" or how many million pixels it can record in a single image. The number of pixels a camera captures is called the camera's resolution. • Eg, 1600 x 1200 pixels produces an image with a resolution of 1.92 million pixels and referred to as a 2.0 megapixel camera • 5 megapixel image with dimensions of 2560x1920 pixels. it34200/unit3/formatsconventions.ppt

  3. Digital Image Resolution • In general more resolution means better print quality. • It also gives you an advantage if you need to crop or to cut the image. • Computer monitors display images at 72 ppi (pixels per inch), meaning that there are 72 pixels for every 1 inch of linear screen space you see on your screen. • Therefore, if you have an image on the screen that is 720 pixels wide, it will take up 10 inches of linear screen space (72 dpi x 10 inches = 720 pixels). • On a printer at 72 dpi the result will look extremely choppy and jagged. it34200/unit3/formatsconventions.ppt

  4. DPI, Printer Resolution • DPI is determined by your hardware, ie. your printer • Dots Per Inch cannot be changed by the user through image editing software. • Dots Per Inch has no effect on the size of your printed image • Dots Per Inch does have an effect on the quality of your printed image. it34200/unit3/formatsconventions.ppt

  5. Sharing photos, email/web • original image, eg.3 mp is 2048 pixels x by 1536, >200% larger than the av. computer monitor is capable of displaying (assume the monitor is set to 1024x768). • Need to resize that picture that will be completely visible on the screen (resolution) and one that will not take so long to send via email (file size). • Done in s/w; resizing where the largest dimension is no bigger than 600 pixels.

  6. How many pixels do I need for printing photos? • How many pixels you need depends on: • How you will be using the photo, eg. Web or printout • What size it will be printed

  7. Image Types BMP, Bitmap, suitable for illustrations, logos, etc. and are not compressed JPEG, jpg, suitable for photographs, and are compressed GIF, for buttons, bullets, banners, etc. they are compressed WMF, vector image, used to store clipart images for windows TIFF, bitmap image used for high resolution scanning EPS, vector image, to create illustrations

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