1. Vector images
Vector images are generated from mathematical descriptions that determine the position, length, and direction of lines, in which objects are drawn. Vector based graphics represent objects as geometric shapes.
Vector images and their elements can be changed easily at any time without a loss in quality since each part is stored as an independent object.
Elements and the whole images can be enlarged unlimitedly.
Vector graphics produce high-resolution images suitable for print.
The resulting image file is typically smaller than a bitmap file containing the same image.
Advantages of vector graphics:
Disadvantages of vector graphics:
Vector images can’t be imported to the most of computer programs.
Vector images can’t be browsed in image viewers.
Vector images can’t be used in Web.
Vector programs are professional programs, which are used in graphic designed. They are not so popular for common use.Vector graphics are used for illustrations and typography. Postscript is a vector graphic software language.
Vector graphic programs are Adobe Illustrator, Macromedia Freehand, and CorelDraw.
Vector converting formats are PDF, encapsulated PostScript (EPS), and SVG.
2. Raster or bitmapped images.
Raster or bitmapped images contain graphics information represented by a sequence of pixels (picture elements) arranged in rows and columns, which when taken together, describe the display of an image on an output device. If you zoom in, the pixels get bigger and you can see them as square spots of color.
There are many different raster image formats in use, among them GIF, JPEG, PCX, and TIFF.
Raster graphic programs are Adobe Photoshop, Adobe ImageReady, ACDSee.
Advantages of raster graphics:
Raster converting formats are PDF, encapsulated PostScript (EPS).
A raster database maintains a similar picture of reality, up to photographic images.
Full correspondence between numerous types of files, different programs and viewers.
Raster graphics are used in creation of animated images.
Raster graphics is convenient for use in Web.
Disadvantages of raster graphics:
Raster images can’t be easily modificated.
Enlarging of images leads to loss in quality.
While aspiring to use advantages of both – vector and raster graphics, we offer you files in formats that convert one to another. You can open such files in any program you wish, according to your needs.
These formats are: EPS and PDF.
EPS - Encapsulated PostScript.
Encapsulated PostScript (EPS) is a standard format for importing and exporting PostScript language files in all environments. It is usually a single page PostScript language program that describes an illustration. The purpose of the EPS file is to be included as an illustration in other PostScript language page descriptions. The EPS file can contain any combination of text, graphics, and images.
An optional component of an EPS file is a preview'' image of the file's content. The preview image is a bitmapped representation of image, which may be displayed by programs using the EPS file without having to actually interpret the PostScript code.
If you would like to work with a vector image:
- Open a vector graphics program such as Macromedia Freehand (preferred for our images) Adobe Illustrator or CorelDraw.
- In file menu click “open” and choose the file.
- Save the file as the document of corresponding program (FH, AI or CD formats).
If you would like to work with a raster (bitmap) image:
- Open a raster graphics program such as Adobe Photoshop, Adobe ImageReady, ACDSee
In file menu click “open” and choose the file. While opening the EPS file in the raster graphics program you’ll be asked to determine resolution. You can choose any resolution you like according to your needs.
- Save the file in one of the bitmap formats: PSD, TIFF, JPG, GIF or others.
- You can save it as EPS also, but then it will be opened only as a raster image in the future.
Caution: professional printers won't have any trouble working with this format but home computer's printer might!
PDF - Portable Document Format.
Portable Document Format was created and originally destined for converting different formats.
PDF is a universal file format that preserves the fonts, images, graphics, and layout of any source document, regardless of the application and platform used to create it. One can convert any document to Adobe PDF using Adobe Acrobat or exporting file to PDF. PDF files can be opened using Adobe Acrobat Reader, but they are also accessible with the help of both: rater and vector graphics programs. Open and save the files in the same way as EPS files.
Why do you get from us EPS and PDF files, if their functions are so close?
Really, we double the data in order that you can choose what format gives you the best result. It can depend on system and programs, which you use.
Formats of raster (bitmapped) images.
The TIFF (Tagged Image File Format) format is very common in graphic design. It was created in the 1980's to be the standard image format across multiple computer platforms. One can save TIFF files for both Macintosh and Windows systems. Most every image-editing program can create and save image files in this format. They're also ideal for being imported into page-layout programs.
Since it was designed to be adapted for variety of printers, scanners and monitors, it has a very rich space of information. TIFF is also the most used lossless image format in the world. These excellent features of TIFF format are the source of its only disadvantage – large file size.
PSD is the working format of the most popular image-editing program Photoshop. It supplies working in layers, which is very comfortable. When you open EPS file in Photoshop it contains a transparent layer with an image and background. This gives opportunity to create transparent GIFF file or to add any background, you wish. If you are an expert user of Photoshop, can easily combine few images into one in PSD format. Files have maximum size. To store or further use it’s recommended to save files in JPG or GIFF formats.
JPG (Joint Photographic Experts Group) is compressing format commonly used to minimize graphics file sizes. JPEG images are full-color images (24 bit, or "true color"). Because of this it’s ideal for compressing conventional pictorial photographs and complex illustrations with smooth color and tonal transitions. JPEG images have generated tremendous interest among photographers, artists, graphic designers, and other specialist, who were interested to get quality images in minimum sizes.
JPEG compression uses a sophisticated mathematical technique called a discrete cosine transformation to produce a sliding scale of graphics compression. You can choose the degree of compression you wish to apply to an image in JPEG format, but in doing so you also determine the image's quality. In web design special rate of compressing is used to make images optimized to Internet.
GIFF (Graphic Interchange Format) was designed in 1980s specially for needs of World Wide Web and since then was widely used to transmit images across data networks. GIF files incorporate a compression scheme to keep file sizes at a minimum, and they are limited to 8-bit (256 or fewer colors) color palettes. Several slight variants of the basic GIF format add support for transparent color. GIFF compressing is better fits for design elements, composed of hard-edged graphics, such as diagrams, typography within images, and many illustrations.
The GIF format allows you to pick colors from the color lookup table of the GIF to be transparent. Usually the color selected for transparency is the background color in the graphic, so that it can be placed on basic background without a frame.
The GIF file format allows you to combine multiple GIF images into a single file to create animation. GIF animations are a very popular form of Web multimedia, because they're small and display on all current graphical browsers without needing a special plug-in.
PNG (Portable Network Graphic) format was also designed specifically for use on Web pages, and they offer a range of attractive features that should eventually make PNG the most common graphic format. These features include a full range of color depths, support for sophisticated image transparency, better interlacing, and automatic corrections for display monitor gamma. PNG images can also hold a short text description of the image's content, which allows Internet search engines to search for images based on these embedded text descriptions. Unfortunately, the PNG graphic format is not yet widely supported, and the current implementation of PNG graphics in the major Web browsers does not fully support all of PNG's features.