Contents

Introduction

Advantages

Disadvantages

Process raw files

Introduction

RAW files are digital negatives

Proprietary- lots of formats cr2, nef, nrw,

etc

Adobe DNG – open

Demosaicing

Good things

RAW can be 14 bits Jpeg is 8 bits

Control Sharpening

Noise reduction

Exposure

Lens distortions

Best image quality –lossless compression

Image manipulation is non destructive in RAW

A good picture can be made perfect

Remember that cant make a bad picture into a good picture!

Bad things

Big files: RAW 24MBytes, JPEG

4MBytes

Number of frames in a burst (demo)

Process them - TIME&EFFORT-Solution

take JPEG+RAW

Not universal like jpeg - no standard

Processing RAWs

Besides Canon's ZoomBrowser and Digital Photo Professional, several other software programs provide read support, and sometimes write support, for CRW files including:

Adobe Photoshop

Aperture

AZImage based on libraw lite

ExifTool

Adobe Lightroom

Picasa

dcraw

jrawio

libraw

Raw Therapee

Digital photo professional

Comes on CD - free

Good: workflow, batch processing

Adds features e.g. lens correction,

unsharp mask, stamp tool

Workflow

Use jpeg (zoom browser) to quickly

check image, even at 100%

RAW – Quick check tool

Use DPP to process image

Batch process

Save as jpeg

Colour sensitivity is the number of reliably distinguishable colours up to

noise. Roughly speaking, two colours are considered as distinguishable if

their difference is larger than the noise

We get to choose where the bits

are used (moon pic)

Shot settings

My choice

RAW vs

Original JPEG

RAW

ORIGINAL JPEG

RAW vs

processed

JPEG

RAW

JPEG