Lesson 5 - Non Destructive Editing

Lesson 5

Non Destructive Editing

Editing an image in such a way that the original image information is retained in the image file, allowing edits to be reversed or modified without loss of image quality.
Any editing performed is always working on the original image data, and not on a degraded or permanently altered version of it.
This is achieved by ‘parameterising’ the edits rather than actually applying them to the pixels. ie When an edit is performed, the actual image pixels are not altered, but the control settings that were used to perform the edit are remembered and saved with the image file. When the image is reopened all the edit settings are reapplied to the original image pixels to allow the image to be displayed on the screen.


Exercise 6

This exercise is aimed at giving practice in applying the tools and techniques used for non-destructive editing.

Originals






Editied





Non Destructive Image Editing


Questions Part I – The Evolution of Non-Destructive Imaging

1. Define ‘Non Destructive Imaging’ : Process of editing a file without damaging any original data

2. List four challenges introduced by digital photography :-
a. Creates many photos
b. Has to apply edits and actions to many photos
c. Multiple versions of original/source file
d. Rapidly advancing technology - have to stay up to date - file needs to be readable in the future

3. What is meant by a ‘Derivative File’ ? A version of the original file that has been saved with adjustments

4. What are two problems with using ‘Save As …’ to create derivative files ?
a. Takes up/congests disc space
b. Naming confusion between the multiple files

5. What is ‘Self Referenced Non Destructive Imaging’ ?

The use of adjustment layers and groups instead of using multiple files and you can keep them intact by saving as a PSD

6. List two advantages of Self Referenced NDI over the use of Derivative Files :-
a. Doesn't take up as much space
b. Avoids naming confusion as there isn't multiple files

7. Define ‘Parametric Image Editing’ :
Editing images using parameters and instructions

8. What is the difference between a Live Rendering and a Fixed Rendering ?

Live: Use of smart objects allows you to back track and change settings. Rendering happens continusously as changes are made.

Fixed: Settings are fixed to each pixel when saved (eg.jpg)


9. List three advantages of NDI :-
a. Unlimited Undo
b. Save space
c. Apply adjustments to multiple images