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Introduction To Raster Image

Introduction to Raster Images

There are basically 2 types of Images 1.Raster images & 2.Vector images. Vector images are based on mathematical objects such as lines and curves.

But what is a Raster image? It is a type of image made up of small rectangular pieces which are known as pixels. Pixel is a small part of an image i.e. an image is made by combining lots of pixels. That image is known as Raster Image. This Raster image is also known as bitmap images.

Raster ImageRaster images are dependent on the resolution that’s the reason that they have large size. The image becomes pixilated when the zoom level is increased. As Raster image is dependent on resolutions. Due to this some images can be rescaled, while other images are not seen clearly. In Raster image is measured in ppi (pixels per inch).

Raster Image 2

The color system used in Raster images is RGB (Red, Green, and Blue). The pixels usually smooth out visually for the user, who sees a photograph or drawing, when a Raster image is viewed.

Raster RGB

The Formats of Raster Images

  • .tiff (tagged image file format)

It is tag based file format which promotes the interchange of digital photographs and line arts. Mostly Image Manipulation applications, page layout & publishing applications, faxing, scanning, word processing and other applications are supported by tiff. It is an image compression format. This format is developed by Aldus (Adobe Systems). The main purpose of this format is to create such an environment that the image data can Up till now 4 revisions are developed of .tiff

  • Revision 3.0 which is in HTML.

This memorandum is mainly developed by Aldus now known as Adobe in the year 1986.

  • Revision 4.0 which is in HTML.

This memorandum is developed on 31 April, 1987 by Tim Davenport of Aldus and Manny Vellon of Microsoft in conjunction. This revision was developed with minor enhancements.

  • Revision 5.0 which is also in HTML.

This Technical memorandum of Aldus and Microsoft was developed on 8/8/88. The basic new thing about this revision was the LZW compression, support for Palette Color images.

  • Revision 6.0 which is in PDF

This memorandum was developed by Adobe Developers Associations previously known as Aldus in March 1995.

  • .gif (graphic interchange format)

Gif is like short animation. In 1987 CompuServe developed this format. CompuServe developed this format to give some moving effect or animation to a still image.

  • . png (portable network graphics)

To improve the gif and to replace it .png was developed. It was developed by PNG Development Group in 1996

  • . jpeg (joint photographic experts group)

To compress the photographic images this file format is used. By this format we can adjust the storage size and image quality.

  • .bmp (bitmap image)

Bmp file format is very simple format and familiar to windows. Generally bitmap files are stored in Device Independent Bitmap (DIB) format, due to this format windows allow  display of bitmap image to any display device.


CorelDRAW Graphics Suite


Hi readers ! This is Saumil back with some more on vector graphics. Previously we discussed about a very good vector graphics tool, The Adobe Illustrator. Now let us see another great tool for vector graphics, CorelDRAW.

Let’s know CorelDRAW

CorelDRAW is vector graphics editor developed to deliver optimum performance with vectors. CorelDRAW was developed by Corel Corporation which is situated in Ottawa, Canada. It is also the name of Corel’s Graphics Suite. CorelDRAW is designed to provide the user with  a capacity to edit & create vector graphics. As it is a vector based software, it is widely used as a key tool for print designing.

Journey from origin to X4

Corel Corporation was looking forward to develop a vector graphics editing software to accompany the bundle of other desktop publishing programs. So in 1987 Corel hired two software engineers namely, Michael Bouillon & Pat Beirne, & asked them to develop a vector graphics editor. As a result CorelDRAW was released in 1989. It was its first version. Then later in 1991 version 2 was released. Thereafter every year an updated version was released uptill version 6 came out in year 1995. Than version 7 was released in year 1997. The trend continued uptill the release of version 12 in year 2003. Than it had a break for about 2 years. This break was discontinued with the release of CorelDRAW’s version 13 popularly known as CorelDRAW X3. in yera 2006. Then in year 2008 CorelDRAW X4 was released, which is the  14th & the latest version of this software.

In this journey CorelDRAW was converted into a full graphics suite with addition of 3 more softwares. They were Corel PHOTO-PAINT which was a raster based graphics editor, Corel CAPTURE which was a image capturing assistant & Corel Power TRACE which is a tool to convert raster images to vector graphics. This is available inside the CorelDRAW.

Corel Corporation has contributed greatly to the graphics & designing industry by giving such a product, The CorelDRAW Graphics Suite.