+ Film vs Digital. n Film and CMOS sensors capture images in completely different ways:

Transcription

1 + The Techie Stuff

2 + Film vs Digital n Film and CMOS sensors capture images in completely different ways:

3 + First Photo in 1826 Joseph Nicéphore Niépce 8 hour exposure

4 + First Photo of a Person minutes exposure

5 + First Colour Photo

6 + First Instant Camera

7 + First Digital Image <<< 176 Pixels >>>

8 + First Digital Camera By Kodak

9 + First Camera Phone

10 + Film vs Digital n Film is roughly the equivalent of 25 megapixels

11 + Megapixels Video on next slide

12 + Megapixels

13 + More Megapixels means

14 + More Megapixels means

15 + Pixels per Inch / PPI n aka Dots per Inch / DPI n This has nothing to do with taking a photo! n PPI is about the quality you print your photo at

16 + Pixels per Inch / PPI n PPI is how you use all those megapixels n Do you cram 300 into an inch and print a high quality picture at 6 x 4 n or do you print a 8 x 12 photo at a lower quality picture of 150 ppi?

17 + Pixels per Inch / PPI n Aim to print at 300 ppi n Incidentially, if you re sending a photo over the web you want to use 72 ppi and low megapixels (less than 1 maybe?)

18 + Pixels per Inch / PPI n PPI is also important when scanning photos n Find out the highest optical setting for your scanner and use that (usually 600+ ppi)

19 + In a Nutshell More Megapixels = Good except if you re ing your photo!

20 + Or Even More Bluntly Shoot at the highest megapixels your camera has

21 + File Formats

22 + What Do They All Mean?

23 + The Four Types } 1 - Proprietary } Files types used by specific software, such as: copyrighted These tend to be

24 + Proprietary n 1 - Proprietary n Photoshop n GIMP n PhotoFiltre n Pixlr = PSD = XCF = PFI = PXD n some programs can open and/or save in another s propriety format but usually at a cost

25 + Lossy n 2 - Lossy n Most digital photos are compressed in some way n Lossy compression throws away information within a photo

26 + Lossy n 2 - Lossy n The best known lossy format is: Most cameras take their photos as JPEGs

27 + Why Use JPEG? n Because how much information it throws away can be adjusted

28 + Photos are Made of Pixels

29 + Lossy n 2 - Lossy n Lossy compression throws away information in an image to make smaller file sizes

30 + Lossy n 2 - Lossy n Lossy compression throws away information in an image to make smaller file sizes

31 + Lossy n 2 - Lossy n Lossy compression throws away information in an image to make smaller file sizes

32 + Lossy n 2 - Lossy n Lossy compression throws away information in an image to make smaller file sizes Quality: 100% 60% 30%

33 + Why Use JPEG? n An uncompressed file can be very large

34 + Why Use JPEG? Quality: 100% Quality: 30%

35 + Why Use JPEG? n So an uncompressed image would take longer to write to your camera s memory card n and who wants to wait 20 seconds between taking photos? n It s a great format for the Internet where file size is the determining factor

36 + Lossless n 3 - Lossless n Lossless compression rewrites the information in an image in shorthand

37 + Lossless n 3 - Lossless n Lossless compression rewrites the information in an image in shorthand

38 + Lossless n 3 - Lossless n Lossless compression rewrites the information in an image in shorthand

39 + Lossless n 3 - Lossless n Lossless compression rewrites the information in an image in shorthand

40 + Lossless n 3 - Lossless n Lossless compression rewrites the information in an image in shorthand 41 characters 28 characters 15 characters 8 characters R3B2R2GR

41 + Lossless n 3 - Lossless n And the beauty is, that when the image is reopened all the original data is restored R3B2R2GR

42 + Lossless n 3 - Lossless n The drawback of lossless compression is that while it produces better quality than JPEG the files are still pretty big n Formats include: TIFF, PNG and BMP

43 + And finally RAW n Raw is a format used on (mainly) digital SLR cameras n Raw is a lossless format that gets around the problem of a slow write speed to the camera s memory card n How?

44 + RAW EFPB8

45 + RAW n 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 n So the quality of the photo you take on your camera is always better in Raw n Great, but

46 + RAW n There s no standardised format! Every manufacturer uses their own Raw format! n So not all editing software will open a Raw file you may need to convert them using the software that came with your camera n File sizes are still 6x the size of a JPEG

47 + Formats Summary n If you can, shoot in Raw n Always shoot with the lowest amount of image compression n Save Photoshop (or similar) work files in propriety formats, then convert your finished work in more widely used format

48 + >>>END<<<