File extensions
PSD file: A PSD file is a layered Photoshop file, this stand for Photoshop document and is the default file type that Photoshop saves your documents as. This can be converted into JPEGS and other types of files later on.
Jpeg: Jpeg is a common file format and one of the most used, it is a form of lossy compression The standard was established on March 1, 1991 in a meeting at C-Cube Microsystems. A Jpeg compression is best used on photos and paintings of realistic scenes.
Jpeg: Jpeg is a common file format and one of the most used, it is a form of lossy compression The standard was established on March 1, 1991 in a meeting at C-Cube Microsystems. A Jpeg compression is best used on photos and paintings of realistic scenes.
BMP: A BMP image also known as a bitmap image file, is a Raster type image format it is a type of lossless image. A BMP is capable of storing 2D digital images in both monochrome and colour, in various colour depths.
A BMP. image type
http://lbvagrant.com/images/desktops/a-m/Bliss.bmpGIF:
Gif (pronounced jif) is a type of file format used online, it is a Bitmap (or Rasta) image format produced by
CompuServe in 1987 and used widely on the internet mostly on image sharing sites such as 4chan. The format is made to support up to 8 bits per pixel for every image, this allows it to have a choice of 256 colors for every frame. Unfortunly because it only supports only 256 colors it’s unsuitable for being used for color photographs. Gifs are a lossless type of file meaning that the file is bigger but it does not lose any data.
PNG:
PNG (pronounced Ping) is short for Portable network graphics, it is a form of lossy data but is intended to give a trade off between the user loosing data and file size. It is intended to replace GIF.
Lossy: Lossy compression is when the file sacrifices image quality for a smaller file size. It is commonly used for compressing multimedia data such as audio, video and still images streaming videos such as those on YouTube are commonly compressed using Lossy compression.
Lossless: Lossless compression is when the file is larger but has all the image quality. It is commonly used for where it is important the original document and the compressed copy are the same. For example source code, programs which execute and text documents, PNG and Gif only use this sort of compression type.
Scanner: A scanner is a type of device which allows you to upload pictures or drawings onto a computer, they do this by first having the user place the photo face down on the glass plane. A lamp is used to illustrate the document The entire mechanism (mirrors, lens, filter and CCD array) make up the scan head. The scan head passes slowly over the document, reflecting the document onto a angled mirror onto another angled mirror reflecting the original image to a lens. The computer then communicates with the printer using software called a driver to transfer data from the lens to the computer.
Digtical camara: A digital camera is a device letting you take pictures by using very small sensors about the size of your fingernail, on top of these sensors there are millions of of photosensitive diodes, the more of these the better the image quality. There are many different types of cameras:
Compact cameras: Compact cameras are among the smallest types of cameras the lens can not be changed out and are mostly point and shoot.
Compact system: A compact system camera is like a DSLR camera but combines the DSLRs many functions and lenses with the portability of a compact camera.
DSLR:
DSLRs are the biggest and more complex cameras available, you can swap out the lenses and buy expensive equipment such as flash guns, while you can still use it in point and shoot mode most people who use it are professional
Tablet: A tablet is a input device which inputs a drawing done by a person into the computer. There are lots of different types of tablets which differs the way they work.
Passive tablets: Passive tablets are the most common type of tablets and work by sending electromagnetic signals from the tablet. The stylus will then act as a antenna that receives these signals, it then generates another electromagnetic signal which tells the tablet where the pen is.
Active tablets: The main difference between passive and active tablets is that in active tablets there are batteries in the stylus.
Vector: Vector graphics are made by using objects, the computer does this by calculating points. As they are made out of objects instead of pixels they will not blur when zoomed you zoom in. This is often used for cartoons. The disadvantage with this file format, is you can't really create real life images.
A vector image
Raster: Raster graphics use lots of individual squares called pixels, this allows your photos to look realistic. However you are not able to zoom in very far as the image will pixelate if you zoom to far. The file size is also larger then vectors.
Optimizing:
Target image output: Whatever your uploading you want the best quality images at the right size, to do this you must know your formats (see above for formats). This is important as the file size matters, if you were to perform a presentation, having hundreds of high quality images will look good but will have a huge impact on the storage space on your hard drive.
image bit depth: This refers to the number of bits used to make up a singular pixel in a bitmap image.
Examples of image bit depth.
Source: http://110073268unit78.wordpress.com/tag/target-image-output/
Image resolution: Image resolution is the amount of detail a image has, in bitmap or Raster images, it is the number of pixels per square inch. Higher resolution always means the image will have more detail, higher resolution images are genially preferred for video games. As it makes the graphics perform better, however this makes the system have to work harder to display the image. A larger resolution also takes up more memory then a similar image with a smaller resolution.
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A 6000×4200 image
Source:http://110073268unit78.wordpress.com/tag/target-image-output/
A 500 x 450 resolution image, as you can see there is less detail and if you zoom in you'd see a lot of pixels.
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