1. Scanning Basics

2. An image can be created, opened, edited, and saved in over a dozen different file formats in Photoshop. Of these, you might use only a few, such as TIFF,and EPS for print GIF,]PEG,for the web, and the native Photoshop file format for your master documents. Because Photoshop accepts so many formats, an image can be gathered from any number of sources including: scanners, drawing applications, PhotoCDs, still images, video captures, or even other operating systems. You can also create an image entirely within photoshop. Where images come from....

3. Using a scanning device and scanning software, a slide, flat artwork, or a photograph can be digitized (translated into numbers)from analog to digital so it can be read, displayed, edited, and printed by a computer. You can scan directly into Photoshop (Save as psd) or you can use other scanning software and save the scan in a file format that Photoshop opens. Use Tiff or BMP The Scanner...

4. Quality and Settings Always start with as high quality an original as possible... Scan at 100% of original image size Scan at highest quality for target out put

5. Two types of scanners... High quality scanners...Flat bed scanners

6. produce an RGB scan. Good for low to average quality print work Excellent for web or onscreen work inexpensive

7. High end scanners such as... high-resolution CCD scanners, such as a Scitex Smart-Scanner, or on a drum scanner or a slide scanner for transparencies CMYK scans, which are usually large in file size.

8. High end scanners such as... professional-quality output mid to high end print work Can optically distinguish subtle differences in luminosity, even in shadow areas

9. High end scanners such as... more accurate color and crisper details capture a wide dynamic range of color

10. Parameters of a scan... is the number of pixels an image contains, and it is measured in pixels per inch. The monitor's resolution is also measured in pixels per inch (72 pixels per inch). Output devices also have their own resolution, which is measured in dots per inch The higher the resolution of an image, the more pixels it contains, and thus the more information for detail, but the larger will be its file size. Resolution

11. DPI Dots per inch or PPI Pixels per inch: The number of dots in the image, the higher the number of dots, the higher the quality of the image Parameters of a scan... Resolution is also...

12. RGB for onscreen display Parameters of a scan... Color mode and use CMYK for print

13. 8 bit 256 colors also known as an index palette Parameters of a scan... bit depth=the number of colors in the image 24 bit 16.7million colors 32 bit 16.7 million colors + alpha channel 16 bit Thousands of colors

14. Image size or Dimensions The width and height of an image Parameters of a scan... Pixels=webInches=print The physical dimensions

15. The file size of an image, which is measured in bytes, kilobytes, megabytes, or gigabytes Parameters of a scan... File size The amount of storage space the image occupies

16. Scanning for... Web or Onscreen DisplayPrint Environment 72 dpi (or PPI) 24 bit or true color then truncate palette by converting to web format At screen size or dimensions 100% 300 dpi 24 bit or true color File Size small 1x At screen size or dimensions 100% File Size large 4x Web =gif jpgPrint=tiff eps

17. Resolution For print 300 dpiFor web 72 dpi or (ppi) Choose the right resolution Don’t choose higher than you really need If resolution is too high... it will take longer to render on screen, display on the Web, or print, and there will be no improvement in output quality

18. Resolution For print 300 dpiFor web 72 dpi or (ppi) Choose the right resolution Don’t choose higher than you really need If resolution is too low... too Iow a resolution will cause a printed image to look coarse and jagged, and its details will be lost.

19. .Cropping: If you're planning to use only pa of an image, reposition the handles of the box in the preview area to reduce the scan area. Cropping can significantly reduce th( storage size of a scan. Scale: To enlarge an image's dimensions, choose a scale percentage above 100%. Enlarging an image or increasing its resolu tion in Photoshop or any other software program may cause it to blur, because the program uses mathematical "guesswork" (interpolation) to fill in additional inform, tion. An image's original information is on recorded at the time of scanning! On the other hand, Before selecting a resolution for print output, ask your print shop what printer or imagesetter resolution and halftone screen frequency they plan to use. (The scan resolution is different from the resolution of the output device.) As a general rule, for a grayscale image, you should choose a resolution that is one-and- a-half times the halftone screen frequency (lines per inch) of your final output device, or twice the halftone screen frequency for a color image

20. Preview: Place the art in the scanner, then click Preview or PreScan. Scan mode: Choose Black-and-White Line Art (no grays), Grayscale, or Color (choose millions of colors, if available).An image scanned in Color will be approximately three times larger in file size than the same image scanned in Grayscale. Resolution: Scan resolution is measured in pixels per inch (ppi)

21. Resolution for Web graphics When creating an image which will be output to the Web, first decide how large your user's browser's window is likely to be, and then figure out how much of the window you want your image to cover. Begin by determining what monitor resolution your viewers are most likely to use. These days, according to Websites like websnapshot.com which track such things, more than half of all browsers are running on monitors set to 800x600 pixel resolution. When you subtract the space taken up by menu bars, scroll bars, and other controls that are part of the browser interface, you're left with a "canvas" of about 740x460 at the most. Given that most viewers won't fill their entire screen with the browser window, you shouldn't count on much more room than 660x420. You might find it useful to create a blank document at 660x420 resolution, 72 pixels per inch, to use as a template. Keep it in the background while you work, so as you create the actual images for your Web page you can see what portion of the screen they'll cover. (Don't fret over the inch equivalent for pixels. On- screen imagery is measured in pixels.) Resolution for Web Graphics