Visitor # 382
All too often when you wanted something printed professionally, you
find that you start asking for file formats you�ve never even heard of,
let alone have your image in. To make sure you�re in the know next
time, here is a quick look at what these formats are and how they differ.
Tags: graphic design file formats jpeg gif eps ai
There are two different types of file formats - bitmap and vector drawing. Bitmaps is
the most basic of the formats with each image made up of individual pixels. This
format is most often used with photographs and images that contain subtle shading.
There is however one problem with bitmap images, scaling up the image. This is
because by scaling up the individual pixels become more pronounced, leading to a
jagged appearance. There is the ability to improve this using a technique called anti-
alias which acts to smooth the graphic, however this still will result in a jagged
appearance as the image is scaled up once more. This again can be improved through
increasing the image resolution, however this causes the problem of making the file
larger and therefore slower to load.
Programs that produce such files are Adobe Photoshop, Paint Shop Pro and Corel
Photo Paint, with file formats including BMP, GIF , JPEG, JPG, PNG, PICT
(Macintosh), PCX, TIFF and PSD. The most popular out of these formats for web
pages are Gif and JPEG, the former because of it ability to compress files and therefore
speed up loading time, the JPEG because it allows a full range of colours.
Vector images differ because they are made up of paths. This makes them much
smoother and clearer as the image I scaled up and is what true-type fonts use to ensure
that they lose no quality with changes in size or resolution. It is for this reason that
vector drawings are used for page layout / type / line art and illustration.
Programs that produce these types of files are Macromedia Freehand, Deneba�s
Canvas and Abode Illustrator, the file formats include .ai, .cnv, .cdr and .fh8 .