Digital Image Editing ASSH Computer Training 03 Friday, 4 October 2002 4:30-6:30 pm Amy L. Ladd MD Michael Hausman MD

Goals for this Course Convince yourself your digital camera and your new computer were worth it --and enjoy using them Review basics of cameras, scanners, and printers (Appendix A) Understand compression and file formats (Appendix B) Handle digital images Use basic, advanced Photoshop tools Understand concepts of image storage Prepare images for email and the web

Photoshop 6.0 for course Photoshop 7.0, 5.5, 5.0, 4.0 okay Photoshop Elements, too Demo (download): can’t save images Others--YOYO

Cameras etc. Memory cards PC card readers Printers Scanners Compact Flash SmartMedia Sony Stick PC card readers Printers Scanners “Keep in mind that in spite of its advanced technology, the computer is still just a computer. It’s not omnipotent. It’s not human. It’s just a machine. It has its limitations. Accept computers for the amazing tools they are, but don’t give them power over you.” --Simplify Your Work Life Daily Calendar, 20 August 2002

Image Formats JPEG (Joint Photographic Experts Group) image.jpg “Lossy” but efficient and useful Standard--need good excuse not to use GIF (Graphics Interchange Format) “Lossless” good for transparencies and web Corrupts easily PSD (Photoshop Document) For Layers and special effects TIFF (Tagged Image File Format) Uncompressed, print quality Rarely use image.jpg image.gif image.psd image.tif

JPEG features Compresses and expands well Great for all imaging needs Closing image Sampling (“quality”) Great for all imaging needs Open vs. Compressed 2-10x difference

Digital Jargon Pixel = Picture Element ppi = Pixel per Inch a “box” of information Red, Green, Blue Shape, orientation ppi = Pixel per Inch 72 ppi most monitors (96ppi) dpi = Dot per Inch Dot = “blob” or box No encoded information Printers (Monitors) Image = Mosaic of pixels

Resolution Resolution Recommended File Size dpi vs ppi dpi (dots per inch) = monitors and printers FIXED ppi (pixels per inch) = digital images VARIABLE Recommended File Size Images: Print (300 ppi) PowerPoint (150 ppi) Email (72 ppi)

Pixels vs. Vectors Pixels: Bitmap (boxes) Vectors: Mathematical lines and curves

Pixel Pundits (How to waste space) Pixel # defined with raw image Can’t create more pixel information But . . . can increase file size unwittingly

Overview: Download and Save Download images Via card reader, cable, etc Open Photoshop Edit Save Store

Specific Tasks Rotate Reverse Undo Grayscale Label Advanced: layers Edit effects Save for web Save for print or PowerPoint Store

Image 1: X-ray Grayscale Rotate Reverse Undo Save and name

Image 2: X-ray askew Grayscale Rotate arbitrary Crop Name and save Create smaller derivative Save for web

Image 3: Color Print Image Change image size Change Resolution Fiddle with Resolution Save and name

Image 4: Annotated Image Rotate image Check Image size and Resolution Label features (Layers) Text Arrow Undo and edit Save psd (Photoshop Document) Flatten and save jpg

PowerPoint Frustrations

Save for PowerPoint Larger than Web Smaller than Print Compress to ≤ 1 MB open (≤ 300 K closed) Resolution/Size 72 ppi = 6 x 8” (432 x 576 pixels) 729 K 150 ppi = 3 x 4” (450 x 600) 792 K

Add Picture in PowerPoint Slide Layout Feature for Add Picture Doesn’t give you sense of the image size Doesn’t let you animate (appear, disappear) in same sequence with other images

Filing and Storage Derivative System Native image unedited for print (wrist1.tif) Native image compressed (wrist1.jpg) Edited image for web (wrist1a.jpg) Annotated image for print with layers (wrist1b.psd) Annotated image for print with layers flattened (wrist1b.jpg)

Storage Nesting Folders Images Images Work Images Work 2002 Images Work April 2002 Madelung’s [Images]

Web Display Automated Task Web Photo Gallery Upload Folder to Server

Additional Images Advanced Editing Improve imperfections Clone stamp Contrast/Auto Contrast Balance/Auto Balance Dodge/Burn

Image 6: Advanced Editing Framing Matte Vignette Two-tone Subject Eliminate junk Grayscale Color Balance

Conclusions Save, Save, Save Be Parsimonious Compose a Good Picture Ockham’s Razor (Law of Parsimony) “Entities are not to be multiplied beyond necessity" ---William of Ockham (1285-1347) Conclusions Save, Save, Save Make Derivatives but Save original or early copy Use Undo and History palette Save in the format you need Print Web PowerPoint Be Parsimonious Crop, Crop, Crop Eliminate Duplicates Use simple names Compose a Good Picture

Questions

Thank you