Write
a Glossary of the following key technical terms and subjects:
·
Pixel
- A pixel or Picture element as it's known is the basic building block of any image and is the reason you see many of the pictures you see today on Tv, Computer and Phone's. Also linked to the pixel is colour depth which basically means the number of bits per pixel on a computer screen to represent a specific colour. The bits per pixel, The higher colour variety and quality of monitor.
www.computerhope.com/jargon/c/colordep.htm
- A pixel or Picture element as it's known is the basic building block of any image and is the reason you see many of the pictures you see today on Tv, Computer and Phone's. Also linked to the pixel is colour depth which basically means the number of bits per pixel on a computer screen to represent a specific colour. The bits per pixel, The higher colour variety and quality of monitor.
www.computerhope.com/jargon/c/colordep.htm
- The RGB color model is an additive color model in which red, green, and blue light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three additive primary colors, red, green, and blue.The main purpose of the RGB color model is for the sensing, representation, and display of images in electronic systems, such as televisions and computers, though it has also been used in conventional photography.
- Short for Cyan-Magenta-Yellow-Black, and pronounced as separate letters. CMYK is a color model in which all colors are described as a mixture of these four process colors. CMYK is the standard color model used in offset printing for full-color documents. Because such printing uses inks of these four basic colors, it is often called four-colorprinting.
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- · Resolution
- The resolution of a television is the number of pixels in each dimension that the TV can display natively.
The higher the resolution, the more details the picture has. The resolution is not the only factor in picture quality, but it is the easiest to understand and notice.
You can watch a media that is not in the TV's native resolution. However, watching content in a lower resolution than the TV will not increase the quality. Inversely, you will lose details if you watch a 1080p content on a 720p TV.
·
Raster
Images: file formats and uses - psd, bmp, gif, tiff, jpg, png
- Most images you see on your computer screen are raster graphics. Pictures found on the Web and photos you import from your digital camera are raster graphics. They are made up of grid of pixels, commonly referred to as a bitmap.
- Most images you see on your computer screen are raster graphics. Pictures found on the Web and photos you import from your digital camera are raster graphics. They are made up of grid of pixels, commonly referred to as a bitmap.
·
Vector
Images: file formats and uses - eps, wmf, fla, svg, ai
- - Unlike JPEGs, GIFs, and BMP images, vector graphics are not made up of a grid of pixels. Instead, vector graphics are comprised of paths, which are defined by a start and end point, along with other points, curves, and angles along the way. A path can be a line, a square, a triangle, or a curvy shape. These paths can be used to create simple drawings or complex diagrams. Paths are even used to define the characters of specific typefaces.
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- - Unlike JPEGs, GIFs, and BMP images, vector graphics are not made up of a grid of pixels. Instead, vector graphics are comprised of paths, which are defined by a start and end point, along with other points, curves, and angles along the way. A path can be a line, a square, a triangle, or a curvy shape. These paths can be used to create simple drawings or complex diagrams. Paths are even used to define the characters of specific typefaces.
·
Cross-platform
Images: format and uses - pdf
- PDF (Portable Document Format) is a file format that has captured all the elements of a printed document as an electronic image that you can view, navigate, print, or forward to someone else. PDF files are created using Adobe Acrobat , Acrobat Capture, or similar products. To view and use the files, you need the free Acrobat Reader, which you can easily download. Once you've downloaded the Reader, it will start automatically whenever you want to look at a PDF file.
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- PDF (Portable Document Format) is a file format that has captured all the elements of a printed document as an electronic image that you can view, navigate, print, or forward to someone else. PDF files are created using Adobe Acrobat , Acrobat Capture, or similar products. To view and use the files, you need the free Acrobat Reader, which you can easily download. Once you've downloaded the Reader, it will start automatically whenever you want to look at a PDF file.
·
Compression
- lossy and lossless
- Lossless compression reduces a file's size with no loss of quality. This seemingly magical method of reducing file sizes can be applied to both image and audio files. While JPEGs and MP3s use lossy compression, newer compression algorithms, such as JPEG 2000 and Apple Lossless compression, can be used to create lossless compressed files.
- Lossy file compression results in lost data and quality from the original version. Lossy compression is typically associated with image files, such as JPEGs, but can also be used for audio files, like MP3s or AAC files. Lossy images show with jagged edges due to the data that is lost during compression.
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- Lossless compression reduces a file's size with no loss of quality. This seemingly magical method of reducing file sizes can be applied to both image and audio files. While JPEGs and MP3s use lossy compression, newer compression algorithms, such as JPEG 2000 and Apple Lossless compression, can be used to create lossless compressed files.
- Lossy file compression results in lost data and quality from the original version. Lossy compression is typically associated with image files, such as JPEGs, but can also be used for audio files, like MP3s or AAC files. Lossy images show with jagged edges due to the data that is lost during compression.
·
Image Capture Devices – scanner, digital camera,
tablet/smartphone
To capture an image, a scanner relies on a multi-step process:
Scanner -The user places the document on the glass plate and closes the lid.
A xenon lamp or a cold cathode fluorescent lamp (CCFL) illuminates the document.
A belt pulls the scan head -- the mirrors, filters, lenses and charge-coupled device (CCD) array -- slowly over the document. The scan head is attached to a stabilizer to eliminate shaking.
Two or three mirrors reflect the image, each one focusing it onto a smaller surface.
A final mirror reflects the image onto the lens, which focuses the image through the CCD array's filter.
For color images, the scan head makes several passes, each with a different filter. The scanner's software assembles the images from each pass into one complete image..
http://curiosity.discovery.com/question/how-does-scanner-capture-image
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Digital Camera - Digital cameras are very much like all earlier cameras. Beginning with the very first camera all have been basically black boxes with a lens to gather the light, a wheel you turned to focus the image, an aperture that determines how bright the light is, and a shutter that determines how long the light enters. When you take a picture the shutter opens briefly and each pixel on the image sensor records the brightness of the light that falls on it by accumulating an electrical charge. The more light that hits a pixel, the higher the charge it records. Pixels capturing light from highlights in the scene will have high charges. Those capturing light from shadows will have low charges.After the shutter closes to end the exposure, the charge from each pixel is measured and converted into a digital number. This series of numbers is then used to reconstruct the image by setting the color and brightness of matching pixels on the screen or printed page.
http://www.shortcourses.com/guide/guide1-3.htm
.jpg)
To capture an image, a scanner relies on a multi-step process:
Scanner -The user places the document on the glass plate and closes the lid.
A xenon lamp or a cold cathode fluorescent lamp (CCFL) illuminates the document.
A belt pulls the scan head -- the mirrors, filters, lenses and charge-coupled device (CCD) array -- slowly over the document. The scan head is attached to a stabilizer to eliminate shaking.
Two or three mirrors reflect the image, each one focusing it onto a smaller surface.
A final mirror reflects the image onto the lens, which focuses the image through the CCD array's filter.
For color images, the scan head makes several passes, each with a different filter. The scanner's software assembles the images from each pass into one complete image..
http://curiosity.discovery.com/question/how-does-scanner-capture-image
Digital Camera - Digital cameras are very much like all earlier cameras. Beginning with the very first camera all have been basically black boxes with a lens to gather the light, a wheel you turned to focus the image, an aperture that determines how bright the light is, and a shutter that determines how long the light enters. When you take a picture the shutter opens briefly and each pixel on the image sensor records the brightness of the light that falls on it by accumulating an electrical charge. The more light that hits a pixel, the higher the charge it records. Pixels capturing light from highlights in the scene will have high charges. Those capturing light from shadows will have low charges.After the shutter closes to end the exposure, the charge from each pixel is measured and converted into a digital number. This series of numbers is then used to reconstruct the image by setting the color and brightness of matching pixels on the screen or printed page.
http://www.shortcourses.com/guide/guide1-3.htm
·
Optimising -
Graphics and images can be used for entertainment, professionalism or a visual queue.
A graphic designed properly can change your visitor's outlook and/or decision for your site. It is important to have images ready and optimised for your website.
http://www.1960creative.com/1960creative/Optimising_Images.html
Graphics and images can be used for entertainment, professionalism or a visual queue.
A graphic designed properly can change your visitor's outlook and/or decision for your site. It is important to have images ready and optimised for your website.
http://www.1960creative.com/1960creative/Optimising_Images.html
·
Storage
and Asset Management-
This however results in a degree of confusion - as Document Management Systems and Records Management Systems also are used for storing 'Digital Assets' and it will not suprise you to hear and read DMS and RMS suppliers - and even WCMS suppliers all talking about how they provide for Digital Asset Management.
For the purpose of this explanation and to clarify, this article does not discuss or consider the 'streched capability' of other ECM products but focuses on the purer understanding of what a DAM is and does. If your requirements however go beyond the pure requirement to manage a digital asset and you wish to manage other types of content at the same time then of course you should consider the types of asset management in conjunction with your other requirements.
http://www.contentmanager.eu.com/dam.htm
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This however results in a degree of confusion - as Document Management Systems and Records Management Systems also are used for storing 'Digital Assets' and it will not suprise you to hear and read DMS and RMS suppliers - and even WCMS suppliers all talking about how they provide for Digital Asset Management.
For the purpose of this explanation and to clarify, this article does not discuss or consider the 'streched capability' of other ECM products but focuses on the purer understanding of what a DAM is and does. If your requirements however go beyond the pure requirement to manage a digital asset and you wish to manage other types of content at the same time then of course you should consider the types of asset management in conjunction with your other requirements.
http://www.contentmanager.eu.com/dam.htm
Illustrate as required and
remember to cite any sources you have used in your research, both written and
visual.
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