CMYK etc

1,553 views

Published on

A discussion of the various file formats for photographs and layouts including JPEG vs. TIFF vs. raw, PDF vs. native file formats, etc. Includes survey results of what schools and colleges are actually doing.

1 Comment
2 Likes
Statistics
Notes
  • There is no such thing as an IDD format. InDesign files are INDD.
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total views
1,553
On SlideShare
0
From Embeds
0
Number of Embeds
30
Actions
Shares
0
Downloads
35
Comments
1
Likes
2
Embeds 0
No embeds

No notes for slide

CMYK etc

  1. 1. CMYK vs. RGB, JPEG vs TIFF, PDF vs. IDD By Bradley Wilson, Ph.D. bradleywilson08@gmail.com @bradleywilson09
  2. 2. Color modes • CMYK – cyan, magenta, yellow and black • Used in the printing process • For reflected light • A subtractive process • RGB – red, green and blue • Used when the output is a monitor (TV, computer screen, etc.) • For transmitted light • An additive process • Hexadecimal – red, green and blue • Simply a re-numeration of the RGB model • #ffffff = white, #ff0000 = red, #00ff00 = green, etc
  3. 3. From designer Mike Williams Most designers think if they are designing FOR print they should use CMYK, or FOR screen use RGB. Instead, they should be thinking if they are looking at color ON screen use RGB, and if they are checking color ON a print use CMYK. While working on a screen keep the colors RGB and before sending the files to proof and print convert to CMYK. You just cannot trust CMYK colors on a screen. Period.
  4. 4. From designer Andrew Kelsall • RGB files are about 25 percent smaller than CMYK. • Many filters and functions are only available to use in an RGB color mode in Adobe Photoshop and similar programs. • The RGB color gamut is larger than CMYK • Working in RGB means that the images are Web-ready with no color conversion (as opposed to designing for print in CMYK and converting the color to RGB for web-use).
  5. 5. Photo file formats • EPS • GIF • JPEG • PNG • PSD • TIFF • Raw
  6. 6. Photo file formats • EPS — Encapsulated PostScript • GIF — Graphic Interchange Format • JPEG — Joint Photographic Experts Group • PNG — Portable Network Graphics • PSD — Photoshop Document, the native format for Photoshop • TIFF — Tagged Image File Format • Raw — raw, uncompressed data (not an acronym)
  7. 7. SOURCE: Know Your File Types: When to Use JPEG, GIF, & PNG http://www.whoishostingthis.com/blog/2014/12/06/jpeg-gif-png/
  8. 8. Other file formats • IDD — Adobe InDesign native format • PDF — (Adobe) Portable Document Format
  9. 9. JPEG vs. Raw http://www.photo.net/learn/raw/
  10. 10. JPEG vs. Raw • JPEG is faster • JPEG files are smaller • JPEG is a compression scheme (so is TIFF) • Raw files require post-exposure processing • Bob Atkins: “You lose nothing by shooting raw except for time and the number of images you can fit on a memory card.”
  11. 11. Printing terms and formulas • LPI — lines per inch; the number of halftone lines in a published photo (LPI=DPI * 10%) • DPI — dots per inch; the number of dots in an image formed by a laser printer or imagesetter (ex: 600dpi, 1200dpi) • PPI — pixels per inch; a pixel is the smallest component of a digital image (PPI=LPI*2) • So, if you’re printing in a newspaper at 85LPI then 
 the PPI = 85LPI * 2 = 170PPI. • So, if you’re printing in a yearbook at 150LPI then 
 the PPI = 150LPI * 2 = 300PPI.
  12. 12. So… • So, if the maximum data your printer can print is, say, 85LPI for the typical newspaper, why capture information at greater than 170PPI? • 4”x6” photo • RGB, JPEG =12, 300ppi — 196KB • RGB, JPEG =12, 150ppi — 92KB • CMYK, JPEG =12, 300ppi — 788KB • RGB, TIFF, 300ppi — 6.2MB
  13. 13. Scenario: Do you get it? • You take a picture with a digital camera. It comes in as a 17”x22” RGB JPEG file right out of the camera at 72PPI. (Incidentally, this is a 5.55 MB file.) • What is the largest size it can be used in the yearbook? • Turn OFF resampling in Photoshop and type 300 in the Resolution field. • Notice that the Image Size didn’t change.
  14. 14. Extension • Can you run that photo as a dominant, 8”x10”? What are the ramifications for doing so? An 8”x10” photo at 300ppi would be a 23.4 MB file. • Can you run it as a 2”x3” photo? What should you do? Why? • Notice that the finished result is a 2.11 MB file and will have to be cropped to fit 2” x 3”.
  15. 15. How do you compare? • Pick one of your publications. • What file format do you submit pages to the printer? PDF. InDesign. PageMaker. QuarkXPress. Online only. • What file format do you save photos for use in that publication? PNG. PSD. JPEG. TIFF. EPS. • In what color mode do you save your color photos? RGB or CMYK. • At what resolution do you save your photos? 
 72PPI. 85PPI. 130-170PPI. 266-300PPI. 
 I have no idea. Other.
  16. 16. Newspapers: file format PDF IDD PM6 QXP PDF IDD PM6 QXP Online only PDF is the best answer SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers
  17. 17. Yearbooks: file format PDF IDD PM6 QXP PDF IDD PM6 QXP Online PDF is the best answer PDF IDD PM6 QXP Online SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers
  18. 18. Newspapers: photo format PSD JPEG TIFF EPS PSD JPEG TIFF EPS PDF PSD JPEG TIFF EPS PDF JPEG is the best answer SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers
  19. 19. Yearbooks: photo format PSD JPEG TIFF EPS PSD JPEG TIFF EPS PSD JPEG TIFF EPS PSD JPEG is the best answer SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers
  20. 20. Newspapers: resolution 72 85 130-170 266-300 72 85 130-170 266-300 72 85 130-170 266-300 170ppi is the best answer SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers
  21. 21. Yearbooks: resolution 72 130-170 266-300 72 130-170 266-300 72 130-170 266-300 300ppi is the best answer SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers
  22. 22. Newspapers: color mode RGB CMYK RGB CMYK RGB CMYK RGB is the best answer SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers
  23. 23. Yearbooks: color mode RGB CMYK RGB CMYK RGB CMYK RGB is the best answer* SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers
  24. 24. What do the companies recommend? JPEG CMYK 300ppi JPEG, TIFF, PSD RGB, CMYK 300 ppi “We will convert files to CMYK so anyone that want to see if there is a slight color shift with their images should convert before supplying to us.” • Paul Friesen RGB “Our pre-press admin system manages them to CMYK” • Mike Cobb JPG, TIFF or PNG (no PSD) 300ppi RGB “The Prinergy process in the plant, the final step before plates are made, converts to CMYK using our profiles to get the best color possible.” • Gary Lundgren JPG 300ppi
  25. 25. Who prints the yearbook? Herff Jones Jostens Lifetouch Taylor Walsworth Other Herff Jones Jostens Lifetouch Balfour Walsworth Other Friesens SOURCE: Spring 2006 survey of 124 advisers and spring 2009 survey of 138 advisers and spring 2013 survey of 160 advisers Herff Jones Jostens Lifetouch Taylor Walsworth Other Friesens
  26. 26. Conclusions. Thoughts. • Always do what your printer tells you. • For native InDesign files, it seems as though CMYK, JPEG is the preferred format for newspapers but for only about half of yearbooks. Change to JPEG from TIFF is significant. RGB is gaining ground. For PDF files, JPEG, CMYK leads in both media. • Still have to ship fonts and linked files with native files. Missing links alone result in about a 23 percent error rate. • Vast majority of newspapers submit their pages as PDF files. Why not yearbooks? • Move to online submission of yearbook pages (usually a form of PDF) and online-only newspapers is significant.
  27. 27. Contact me By Bradley Wilson, PhD bradleywilson08@gmail.com bradleywilsononline.net • @bradleywilson09 ©2015

×