file sizes & types
DESCRIPTION
File Sizes & Types. Size Matters. Kilobytes (K). - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/1.jpg)
File Sizes & Types
![Page 2: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/2.jpg)
Size Matters
![Page 3: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/3.jpg)
Kilobytes (K)• 1024 bytes = 1 kilobyte—
a tiny trademark graphic or log might be a few kilobytes in size, whereas a full web page might be 35-100 kilobytes. Anything beyond 100K will probably require significant download times for people with dialup modems. Word docs are usually under 1000K, even with images.
10K
![Page 4: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/4.jpg)
Megabytes (MB)
(This PPT presentation is just under 1MB)
• 1024KB = 1MB (megabyte)—Most email servers have maximum of 2MB you can send. PowerPoint presentations get this big because of images. About 10-20 web pages would take up 1MB. Web hosting sites sell server space in terms of megabytes. My web site has more than 2000 files, and I have still not reached my 150 MB capacity (but we’re getting close).
![Page 5: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/5.jpg)
Gigabytes (GB)
• 1024MB = 1GB (gigabyte). Rarely do we see single files that are in the gigabyte range. Usually you will see the term gigabyte to indicate hard drive space.
![Page 6: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/6.jpg)
Terabytes
• 1024GB = Terabyte
![Page 7: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/7.jpg)
File Formats
![Page 8: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/8.jpg)
Common For Web
• JPEG GIF
![Page 9: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/9.jpg)
Original .jpg dithered .jpg gif 8 colors
gif 4 colors
“When Good PhotosGet Saved Badly”
![Page 10: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/10.jpg)
How should this
have been saved:jpg or gif?
How was it saved
instead?
![Page 11: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/11.jpg)
Extension Format Used for `Loss `# Colors Transparency?
.jpgJointPhotographicExperts Group
Continuoustone (e.g.,photos) Web
Lossy ThousandsNO
.gifGraphicInterchangeFormat (Compuserve)
Solid colors(e.g., cartoons)
Web
Lossless
256 + transparency
Yes, GIF-8 (jaggies)
.pngPortableNetworkGraphicsformat
Web(continuoustone or solidcolors)
LosslessThousands
Yes (no jaggieds)but big file
.tifTagged ImageFile Format
Print Only Lossless Thousands Yes
File Formats
![Page 12: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/12.jpg)
Transparency: gifs & pngs for web
![Page 13: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/13.jpg)
“The dreaded white jaggies”
![Page 14: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/14.jpg)
White jaggies are undetectable on white background, but that defeats the purpose of transparency for use with any colored background.
Solution: Use a 24-bit png
![Page 15: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/15.jpg)
Quiz Yourself:How would you save this?
• Photo of your sister on the web
• Black and White logo on the web without transparency
• Black and white logo with transparency
• Image for National Geographic
![Page 16: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/16.jpg)
Compression
• Zip files
• Jpegs
• Tifs
• Compress ONCE
• Cannot uncompress Jpegs and Gifs or add quality that is lost.
![Page 17: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/17.jpg)
Dots Per Inch (dpi)• 72 dpi standard for web
• 85-150 dpi low quality print
• 200 dpi starting point for decent print
• 300 dpi pretty strong
• Goes up to 2,000 dpi for highest quality on average scanners (creates enormous files)
![Page 18: File Sizes & Types](https://reader035.vdocument.in/reader035/viewer/2022062409/56814650550346895db36197/html5/thumbnails/18.jpg)
Questions?