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File Formats - PowerPoint PPT Presentation


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File Formats. Different applications (programs) store data in different formats . Applications support some file formats and not others. Open…, Save…, Save as…, Import…, Export…, Place...

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PowerPoint Slideshow about 'File Formats' - Gabriel


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slide1

File Formats

Different applications (programs) store data in different formats. Applications support some file formats and not others.

Open…, Save…, Save as…, Import…, Export…, Place...

File formats appear as a (usually) 3 letter suffix or “extension” after the name of the file, e.g., .psd, .doc, .jpg, .pct, .tif, .gif, .ppt, etc.

MacIntosh does not require the file extension after the name, but Windows does. On the Mac choose “append file extension” for easier communication across platforms.

slide2

Adobe Illustrator

Save

Save As. . .

Save a Copy. . .

Save as Template. . .

Save for Web. . .

Illustrator can save files in the following basic formats:

.ai — Adobe Illustrator, its “native” format

.pdf — Adobe Portable Document Format

.ait — Adobe Illustrator Template

.eps — Illustrator Encapsulated PostScript

.svg — Scalable Vector Graphics

.svgz — SVG compressed

As well as a number of Web compatible formats (.gif, .jpeg, .png-8, .png-24, .swf, .svg., .wbmp)

slide3

But. . ., Illustrator can open (import) and export files in many (almost 30) different file formats, however when you Export, most formats convert the vector drawing into a bitmap image:

See:

Illustrator Help. . .

Contents. . .

Saving and Exporting. . .

About graphic file formats

slide4

Adobe Photoshop

Save

Save As. . .

Save a Version

Save for Web. . .

Photoshop can save files in many file formats:

.psd — Photoshop Document, its “native” format

.pdf — Photoshop Portable Document Format

.eps — Photoshop Encapsulated PostScript

.tiff — Tagged Image File Format

.gif — Compuserve Graphic Interchange Format

.jpg — JPEG, Joint Photographic Experts Group

.bmp — Windows Bitmap

.png — Portable Network Graphic

etc., etc.

slide5

And. . ., like Illustrator, Photoshop can open many (about 25) different file formats:

However, it can import and export fewer file formats.

See Photoshop Help. . .

Contents. . .

Saving and Exporting Images. . .

slide6

What are the basic graphic file formats?

Which file formats should you use and why?

How does the format affect the file size?

How does the format handle compression?

slide7

EPS

  • Encapsulated PostScript
  • Preferred file format for importing into page layout programs such as QuarkXPress, PageMaker, InDesign, XPress, etc. for subsequent printing.
  • An object-oriented format.
  • Will only print to a postscript printer.
  • Uses lossy JPEG compression.
  • Only save your file as EPS if you need to import it into a page layout program.
slide8

TIFF

  • Tagged Image File Format
  • Widely used cross platform file format also designed for printing.
  • A bitmap image format.
  • TIFF supports lossless LZW compression which also makes it a good archive format for Photoshop documents.
slide9

GIF

  • Graphics Interchange Format
  • Industry standard graphic format for on-screen viewing through the Internet and Web. Not meant to be used for printing.
  • The best format for all images except scanned photographic images (use JPEG for these).
  • GIF supports lossless LZW compression.
slide10

JPEG

  • Joint Photographic Experts Group
  • Preferred format for scanned photographic images for use over the internet or Web. Not meant for printing.
  • Not good for images with a lot of solid color, vector drawings, type, or line art or images with “Web-safe” colors.
  • JPEG compression is lossy! Save and archive the original before converting to JPEG.
slide11

PDF

  • Portable Document Format
  • Developed to transfer and read documents without having to print them—the “paperless office.”
  • Cross platform format that can be read with the free download Adobe Acrobat Reader.
  • Can represent both vector and bitmap graphics.
  • Can also contain electronic document search and navigation features as well as hypertext links.
  • Can be created from almost any application, but the user cannot edit or modify the file except with Adobe Acrobat (or other software).
  • Document formatting, fonts, colors, etc. are maintained and appear identical across platforms.
  • Excellent in the “prepress” process — can be sent to the printer, but can also be placed in other documents.
slide12

File Format and File Size

Vector-graphics files are memory conservative. You can easily work, save, transfer, print, and archive the file in Illustrator’s native format (.ai).

To send to a PostScript printer or place in a page layout program, convert to an EPS or TIFF file; but while TIFF uses lossless compression, EPS uses lossy JPEG compression.

slide13

Bit-mapped images use a LOT of memory and, hence, a lot of disk space. The larger the file, the slower it is to edit, save, print, or send over the internet.

Work with smaller images and archive the image when not in use or use compression.

But. . . be careful with lossy compression

Work in Photoshop’s native file format (.psd) until you have to do something with the image.

slide14

Compression: to lose or not to lose?

Lossless Compression

vs.

Lossy Compression

slide15

Lossless compression types:

  • RLE (Run Length Encoding)
  • LZW (Lempel-Ziv-Welch)
  • Huffman
  • Zip

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Uncompressed

000000000000000000000111111111111100000000000001111111111111111111111

RLE

Row 1, 21:0,13:1;13:0;22:1

LZW, etc. use algorithms in addition to RLE

01010101010101010101

slide16

“Lossy” compression types:

  • JPEG
  • Genuine Fractals
  • Mr. SID

9:1

“averaging”

Original

Compressed

slide17

In Photoshop, when you Save as… a JPEG file, you can choose the level of compression and, therefore, the size and quality of the file.

slide18

JPEG cautions:

  • Images with hard edges, high contrasts, angular areas, and text suffer from JPEG compression.
  • Scanned “natural” photographs do not lose much, especially at High or Maximum quality.
  • Only save finished images as JPEGs, every time you open and save again, even if you don’t edit, you lose quality.
  • Always keep the original non-JPEG version (the native .psd format).
  • So why use JPEG?
  • It is the best format for photographic images on the Web.
  • It’s compression ability is very great.
slide19

HIGHLY RECOMMENDED

D. Blatner and B. Fraser, 2004, Real World Adobe Photoshop CS, Peachpit Press.