Optimising

Optimising is making the best or most effective use of something, in this case digital graphics


Target image output
Image output is very important when viewing your image. The image output will effect how the image will look. For best results you should aim for the best possible output. An example of this would be an image created specifically for a desktop background, the image would aim to be        1920 * 1080 for a perfect high resolution fit.


Image bit depth
Bit depth usually refers to bitmap images. Bit depth is the amount of bits to reveal the colour of a single pixel. If their are more bits in the whole image the image will appear better.


Image Resolution
Image resolution refers to the detail of an image. Images with a higher resolution will look more detailed. If you are creating a very large image such as for a poster it is important to use a larger resolution.
Image resolution will effect the size of the file, so if memory is an issue this is something to consider.
Image resolution is calculated by the number of pixel across by the number of pixels down.


Image Dimentions
Image dimentions are the width by length of a digital image.The main measurement of dimentions is in pixels. Some programs will let you view and work in centimetres or inches, adobe photoshop has the feature of being able to work with both.


Compression
There are two types of compression these are; lossy and loss less.
Lossy images remove some data and lose some quality of the image, some of the images information may be lost perminantly with this method of compression.
Loss less compression will change the way in which the file is stored to reduce file size. Loss less compression also makes no visble alterations to the image.