Unit 8

Tim Clouse

Airbrushing

• Abner Peeler• 1879• Photo retouching • Photo manipulation • Air • Paint

Film Recorder

• Recording of a “retouched” photograph on film

• Produces an original or first generation film photo

• There can be no identification of any manipulation of the photo in this process

Pixels and MetadataPicture Elements

Metadata stores Information such as date, time, camera used, camera settings… Standard format EXIF

Format Types

• JPG or JPEG• Lossy Compression Low resolution, low storage rate • RAW or TIF once call TIFF• Lossless Compression Higher resolution, Higher storage rate

Process of Digital Prints

Each agency or person has own methods of processing (Training, skill level, experience, SOP)

Printers

• Inkjet, Laser, Dye sublimation• Inkjet—More settings, higher volume of

product, reproduces more colors, can be set to use special papers (photo, matte, gloss) Longer wait time

• Laser—Less settings, lower volume of product, reproduces less colors, less wait time

• Dye-Sublimation—Same a laser, but uses more product

Digital Image Categories

• Category 1—Used for Documentation of images used to record a time, place or event

• Category 2—Used as Evidentiary images used for scientific analysis and comparison

Category 1 Photos

General Crime Scene Photos Surveillance Images Autopsy Images Documentation of Items of

evidence in a lab Arrest Photos (Mug Shots)

Category II

Latent Prints Bloodstain patterns Questioned Documents (forgery) Tool Marks Gunshot residue Impression evidence Any other images subject to analysis

Processing of CAT 1 and 2

• Described as CAT 1 being stored in a JPG format

• I suggest to store all images in a RAW or TIF file, this way all information is stored for future use

• Refer to your departments SOP

Dots vs. Pixels

• Cameras use Pixels to record the image which are tiny squares

• Dots are used to reproduce the image on paper, they are usually irregular in shape and vary on paper

Storage Issues • Storage volume • Format • Accessibility• Who downloads CD/DVD• Backing up photos for storage (Video

included)

Film vs. Digital?----Poll----

After studying both Film and digital print which would you prefer to work in?

Unit 9• Read Chapter 12 in Crime Scene Photography • Review key terms • Complete Web Field Trip • Attend the weekly seminar • Respond to the discussion board • Complete Scenario Based Expository Essay

Make sure that you review all aspects needed in this Essay under Unit 9!!!!!!