How To Enlarge Images Without Loosing Quality
There are two kinds of computer graphics - raster (composed of pixels) and vector (composed of paths). Raster images are more commonly called bitmap images. A bitmap image uses a grid of individual pixels where each pixel can be a different color or shade. Bitmaps are composed of pixels. Bitmap graphics are the most common graphic format in use on the web and, indeed, on the computer. A pixel is minutely small; a single image may be composed of hundreds of thousands of individual pixels. Much like cells revealed from a piece of tissue when seen under a microscope, these pixels are only clearly and individually visible when the image is magnified.
Vector graphics use mathematical relationships between points and the paths connecting them to describe an image. Vector graphics are composed of paths.
The image to the left below is representative of a bitmap and the image to the right is representative of a vector graphic. They are shown at four times actual size to exaggerate the fact that the edges of a bitmap become jagged as it is scaled up:
| Bitmap Image: | Vector Graphic: |
| Anti-Aliased Bitmap Image: | Smooth Vector Image: |
Bitmap images require higher resolutions and anti-aliasing for a smooth appearance. Vector-based graphics on the other hand are mathematically described and appear smooth at any size or resolution.
Bitmaps are best used for photographs and images with subtle shading. Graphics best suited for the vector format are page layout, type, line art or illustrations.
Because a bitmap image is this collection of squares, it doesn't hold up well to expansion. The more dots per inch, the better the resolution of the image. Vector image is much more sophisticated because it has more moving parts. Each vector image is made up of a handful of smaller images, just like the bitmap, except that the vector image's parts are scalable. This means that designers can change the resolution of a vector image in both directions, making a high-res image lower or making a low-res image higher. If designers are looking for an image that can be easily scaled in both directions, then their choice between vector and bitmap should be an easy one.
Vector and Bitmap Differences-
Common bitmap formats include:
• BMP
• GIF
• JPEG, JPG
• PNG
• PICT (Macintosh)
• PCX
• TIFF
• PSD (Adobe Photoshop)
Popular bitmap editing programs are:
• Microsoft Paint
• Adobe Photoshop
• Corel Photo-Paint
• Jasc Paint Shop Pro
• Ulead PhotoImpact
Common vector formats include:
• AI (Adobe Illustrator)
• CDR (CorelDRAW)
• CMX (Corel Exchange)
• CGM Computer Graphics Metafile
• DXF AutoCAD
• WMF Windows Metafile
Popular vector drawing programs are:
• Adobe Illustrator
• CorelDRAW
• Macromedia Freehand
• Xara X
A vector graphic resized to 5 times its original dimensions is simply reproduced, exactly, at the new size. It can also be freely manipulated without losing coherence, like a rubber band that can be stretched an infinite number of ways.
There is a website called Vector Magic which offers free online auto-tracer service to converts bitmap images to vector images. All you need to do is upload your image and they will vectorize it for you! Let me show you how easy it is. You will need Adobe Flash Player for this to work.
1. Browse the image that you want to convert to vector image and click Upload.
2. Choose the quality level of the image.
3. Select if your image has less than 12 colors or many colors
4. Select the palette used for vectorizing your image.
5. Done! You can download the results in EPS, SVG or PNG format. You can also share the vectorized image by clicking the Share button to get the link
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| Beta |
Fileformats supported :Input - JPG, GIF, PNG, BMP, TIFF Output - EPS, SVG, PNG
Softwares:
gzip (free, all systems)
In the beginning an important tip: you can compress SVG files substantially, either by using gzip or by using the Adobe SVG Viewer 3. The compressed files have the suffix .svgz and can be read by the viewer.
KVEC 2.75 (shareware, all systems)
If you don't mind working in the command line (like the MS-DOS command line), you can use KVEC to convert several raster formats (BMP, GIF, JPG, TIFF,...) into various vector formats - amongst them SVG.
fds for SVG 0.1 (Windows, free)
This little tool (zipped 21 KB!!) really converts bitmaps to SVG, mind you with some ;-) restrictions, which are pointed out on the developer's page.
1. It only works with 8-bit Windows bitmaps.
2. The original has to be smaller than 600x600.
3. Images with many colours will experience an interesting but unwanted change after conversion
CR2V Celinea Raster to Vector converter (free, Windows)
Here, too, you have to enter the conversion commands into the command line.
Adobe Illustrator : ( Windows and Mac) Download from here
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1 comments:
I have nice experience of working with web-based free online image converter Imverter.com it is a great image conversion tool. You can use this online utility to convert between multiple image file formats like png, gif, jpg, bmp, ps, eps, tiff, and more. It is a great tool to make your images in useable formats.
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