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Photography: 6 - Megapixels and File Formats
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Photography: 6 - Megapixels and File Formats

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All you need to know about megapixels and digital file formats

All you need to know about megapixels and digital file formats

Published in Education , Technology , Art & Photos
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Transcript

  • 1.  Film and CMOS sensors capture images in completely different ways:
  • 2. 8 hour exposure Joseph Nicéphore Niépce
  • 3. 10 minutes exposure
  • 4. <<<176Pixels>>>
  • 5. By Kodak
  • 6.  Film is roughly the equivalent of 25 megapixels
  • 7. Video on next slide…
  • 8. http://www.youtube.com/watch?v=lGeAu2RQc
  • 9.  aka Dots per Inch / DPI  This has nothing to do with taking a photo!  PPI is about the quality you print your photo at…
  • 10.  PPI is how you use all those megapixels…  Do you cram 300 into an inch and print a high quality picture at 6” x 4”…  …or do you print a 8” x 12” photo at a lower quality picture of 150 ppi?
  • 11.  Aim to print at 300 ppi  Incidentially, if you’re sending a photo over the web you want to use 72 ppi and low megapixels (less than 1 maybe?)
  • 12.  PPI is also important when scanning photos  Find out the highest optical setting for your scanner and use that (usually 600+ ppi)
  • 13. More Megapixels = Good …except if you’re emailing your photo!
  • 14. Shoot at the highest megapixels your camera has
  • 15.  1 - Proprietary  Files types used by specific software, such as: These tend to be copyrighted
  • 16.  1 - Proprietary  Photoshop = PSD  GIMP = XCF  PhotoFiltre = PFI  Pixlr = PXD  …some programs can open and/or save in another’s propriety format – but usually at a cost
  • 17.  2 - Lossy  Most digital photos are compressed in some way  Lossy compression throws away information within a photo…
  • 18.  2 - Lossy  The best known lossy format is: Most cameras take their photos as JPEGs
  • 19.  Because how much information it throws away can be adjusted…
  • 20.  2 - Lossy  Lossy compression throws away information in an image to make smaller file sizes…
  • 21.  2 - Lossy  Lossy compression throws away information in an image to make smaller file sizes…
  • 22.  2 - Lossy  Lossy compression throws away information in an image to make smaller file sizes…
  • 23.  2 - Lossy  Lossy compression throws away information in an image to make smaller file sizes… Quality: 100% 60% 30%
  • 24.  An uncompressed file can be very large
  • 25. Quality: 100% Quality: 30%
  • 26.  So an uncompressed image would take longer to write to your camera’s memory card…  …and who wants to wait 20 seconds between taking photos?  It’s a great format for the Internet where file size is the determining factor
  • 27.  3 - Lossless  Lossless compression rewrites the information in an image in ‘shorthand’…
  • 28.  3 - Lossless  Lossless compression rewrites the information in an image in ‘shorthand’…
  • 29.  3 - Lossless  Lossless compression rewrites the information in an image in ‘shorthand’…
  • 30.  3 - Lossless  Lossless compression rewrites the information in an image in ‘shorthand’…
  • 31.  3 - Lossless  Lossless compression rewrites the information in an image in ‘shorthand’… R3B2R2GR 41 characters 28 characters 15 characters 8 characters
  • 32.  3 - Lossless  And the beauty is, that when the image is reopened all the original data is restored… R3B2R2GR
  • 33.  3 - Lossless  The drawback of lossless compression is that while it produces better quality than JPEG the files are still pretty big  Formats include: TIFF, PNG and BMP
  • 34.  Raw is a format used on (mainly) digital SLR cameras  Raw is a lossless format that gets around the problem of a slow write speed to the camera’s memory card  How…?
  • 35. http://www.youtube.com/watch?v=Qsi71MEFPB8
  • 36.  Raw does not create the actual photo image in the camera, it simply stores the raw data to be converted to another format at a later date  So the quality of the photo you take on your camera is always better in Raw  Great, but…
  • 37.  There’s no standardised format! Every manufacturer uses their own Raw format!  So not all editing software will open a Raw file – you may need to convert them using the software that came with your camera  File sizes are still 6x the size of a JPEG
  • 38.  If you can, shoot in Raw  Always shoot with the lowest amount of image compression  Save Photoshop (or similar) work files in propriety formats, then convert your finished work in more widely used format