Non-Destructive. Editing Part 2.

What is a Rendering Engine?
The source image and your processing settings are proceeded in the rendering software and a finished image is created. In other words its the software that takes the file and decodes the information to give you an image.


What three things determine the final colour of the image pixel?

1. The original image data
2. The rendering engine's mathematical forumlas
3. The setting applied by the user to the rendering software 

What are the three main components of a RAW file? 

1. Mosaiced Raw Image
2. Metadata
3. JPEG Preview 

Can PIE software be used on RAW files? 
Yes


What is Live Rendering? 
A live rendering is a view of the image that only exists when the source image is loaded into the software.


Where can the Rendering Metadata be stored? 

• XMP Data - in a side car file (Extentsible Metadata Platform XMP)
• Live inside the file
• In a database 

Give two examples of a Fixed Rendering?

• Print 
• Derivative file, TIF, JPEG, PSD

Is a Preview a Live or a Fixed Rendering of the image?
A preview is neither a live or fixed rendering its a semipermanent fixed rendering of the image that shows adjustments made by the rendering engine/sofware. Fixed as its a JPEG or TIFF file. It's a view of the image but its there just so you can view the image as you make changes. Semi perm as the file is regenerated with each new preview.

Lightroom grabs a preview first and then grabs the live rendering after, this is why images 'flick' and changes as they are loaded or imported.


Where can Previews be stored? 

• Embedded preview in your RAW file
• Cached previews - file browsers such as Adobe Bridge, PhotoMechanic 
• Cached preview - cataloguing such as Lightroom

Why do File Browsers and Cataloguing software create Previews?

• Speed up the viewing of images
• Previews are used as a proxy image for adjustments
• So images are not confused with derivative files