File types

EPS is a file extension for a graphics file format used in vector-based images in Adobe Illustrator. EPS stands for Encapsulated PostScript. An EPS file can contain text as well as graphics. It also usually contains a bit map version of the image for simpler viewing rather than the vector instructions to draw the image.(http://whatis.techtarget.com/fileformat/EPS-Encapsulated-Postscript-Vector-graphics-Adobe-Illustrator)

Almost everyone uses PDF for saving and sharing entire documents, such as InDesign files. You can also save graphic images—and in particular, commercial print-bound graphics—as PDF images. This allows you to take advantage of the PDF’s inclusiveness, editability, printability, and inherent Internet compatibility. Here are some tips for creating and working with high-quality PDF graphic images.(http://layersmagazine.com/pdf-for-graphic-files.html)

TIF

Versatile, many formats supported.
Mode: RGB or CMYK or LAB, and others, almost anything.
8 or 16-bits per color channel, called 8 or 16-bit “color” (24 or 48-bit RGB files).
Grayscale – 8 or 16-bits,
Indexed color – 1 to 8-bits,
Line Art (bilevel)- 1-bit

For TIF files, most programs allow either no compression or LZW compression (LZW is lossless, but is less effective for color images). Adobe Photoshop also provides JPG or ZIP compression in TIF files too (but which greatly reduces third party compatibility of TIF files). “Document programs” allow ITCC G3 or G4 compression for 1-bit text (Fax is G3 or G4 TIF files), which is lossless and tremendously effective (small). Many specialized image file types (like camera RAW files) are TIF file format, but using special proprietary data tags. 24-bits is called 8-bit color, three 8-bit bytes for RGB (256x256x256 = 16.7 million colors maximum.) Or 48-bits is called 16-bit color, three 16-bit words (65536x65536x65536 = trillions of colors conceptually)(http://www.scantips.com/basics09.html)

JPG

RGB – 24-bits (8-bit color), or Grayscale – 8-bits

JPEG always uses lossy JPG compression, but its degree is selectable, for higher quality and larger files, or lower quality and smaller files. JPG is for photo images, and is the worst possible choice for most graphics or text data.(http://www.scantips.com/basics09.html)

PNG

RGB – 24 or 48-bits (called 8-bit or 16-bit “color”),
Alpha channel for RGB transparency – 32 bits
Grayscale – 8 or 16-bits,
Indexed color – 1 to 8-bits,
Line Art (bilevel) – 1-bit

Supports transparency in regular indexed color, and also there can be a fourth channel (called Alpha) which can map RGB graduated transparency (by pixel location, instead of only one color, and graduated, instead of only on or off).

The APNG version also supports animation (like GIF), showing several sequential frames fast to simulate motion.

PNG uses ZIP compression which is lossless, and somewhat more effective color compression than GIF or TIF LZW. For photo data, PNG is somewhat smaller files than TIF LZW, but larger files than JPG (however PNG is lossless, and JPG is not.) PNG is a newer format than the others, designed to be both versatile and royalty free, back when the patent for LZW compression was disputed for GIF and TIF files.(http://www.scantips.com/basics09.html)

ASCII is a graphic design technique that uses computers for presentation and consists of pictures pieced together from the 95 printable (from a total of 128) charactersdefined by the ASCII Standard from 1963 and ASCII compliant character sets with proprietary extended characters (beyond the 128 characters of standard 7-bit ASCII). The term is also loosely used to refer to text based visual art in general. ASCII art can be created with any text editor, and is often used with free-form languages. Most examples of ASCII art require a fixed-width font (non-proportional fonts, as on a traditional typewriter) such as Courier for presentation.(https://en.wikipedia.org/wiki/ASCII_art)

MPEG

Short for Moving Picture Experts Group, and pronounced m-peg, is a working group of the ISO. The term also refers to the family of digital video compression standards and file formats developed by the group. MPEG generally produces better-quality video than competing formats, such as Video for WindowsIndeo and QuickTime. MPEG files previously on PCs needed hardwaredecoders (codecs) for MPEG processing. Today, however, PCs can use software-only codecsincluding products from RealNetworks, QuickTime or Windows Media Player.(http://www.webopedia.com/TERM/M/MPEG.html)

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: