Non-Destructive Editing.

Define 'Non Destructive Imaging (NDI)'

NDI referes to image processes where the source image may be adjusted in a way that leaves the original data intact. (Krogh. P, An evolution of rendering technology, pg 1)

The most simple way of putting NDI, is that in post processing you create layers on layers to ensure that the original data is kept intact, giving you as much colour and other information as possible. As when you start to process your source image, you start to lose data that can then not be recovered.

List four challenges introduced by digital photography

1. The creation of a vast number of photos
2. The need to apply identical adjustments to many photos in one operation
3. The need to interpret a single source image in multiple ways (B&W, colour)
4. The desire to take advantage of rapidly evolving image technology to reinterpret image with more capable software in the future.  

What is meant by a 'Derivative File?

A derivative file is a copy of the original file, with any adjustment saved, achieved by using the 'save as' function after each change is made. Your creating a new version of the original file, enabling you to preserve the source file or original file and allowing you to go back to each change/adjustment if required.

What are two problems with using "Save As' to create derivative files?

1. Creating multiple files of the one derivative file creates confusion when it come to working out what file you need at a later date.  
2. Storage as you are re-saving the entire image over and over again. 

What is 'Self Referenced Non Destructive Imaging'?  

Photoshop adjustment layers make it possible to wrap up the source image with a set of instructions, or a set of many instructions, for rendering the photo (Krogh. P, An evolution of rendering technology, pg 3). In other words photoshop creates a layer or preview file on top of the original source file, allowing the data to be preserved.  

List two advantages of 'Self Referenced NDI' over the use of Derivative Files?

1. Storage, Self Referenced NDI files are much more economical and take up less space 
2. You are able to see the adjustments you are making and what the effect is and to come back to the file at a later date and clearly and easily see what adjustments have been made
3. You are able to create a separate interpretation of the file, a black and white, while still making use of some of the work you have already done on other versions.   

Define 'Parametric Image Editing (PIE)'

Software programs that assume the original source file will not be altered, instead saved interactions are applied when the file is being output for use. A small proxy of the photo is used and then references the source file at the time of output.

What is the difference between a 'Live Rendering' and a 'Fixed Rendering'?

• Live Rendering is a view of the image that only exists when the source image is loaded into the software. This type of rendering is considered more/less as a temporary preview. Its your photoshop file with adjustment layers, or its your Lightroom image, or its your indesign file. 
• A fixed Rendering is the final version of your image, your adjustments are fixed into your pixels and is a freestanding image on its own. Its basically your photoshop file flattened so you can print it or its your final Jpeg.   

List three advantages of NDI

1. Cost savings
2. Time savings
3. and creative freedom, without distorting or destroying your original source image.