Apr 13

Image formats

Tif format

The tiff, is the reference format for saving important images like those we will produce with clinical dosimetry scanner.

So this format has become a standard format for professional use.

Its great advantage is that it supports almost any platform and also works up to 48 bit color which is essential for clinical dosimetry with EBT film Radiochromic.

With this image format can be used various types of compression but for clinical dosimetry are not allowed. You always have to keep in tif uncompressed to avoid losing image quality while compression. Because of this need to store uncompressed files have something heavy.

Knowledge for reference and expose other types of image formats but not recommended for clinical dosimetry film with Radiochromic.

BMP formats, JPEG and GIF

A bitmap (bitmap) It is one of the many types of formats for images. Take the extension .bmp.

Computers use bits 1 Y 0 to store data. A bitmap is literally that, a map of ones and zeros that make up a particular image when rendering.

To understand how a raster graphics, a BMP image, it shows, it is important to understand how it works at a computer screen. The screen is composed of rows and columns of small blocks, pixels. In a bmp image, each pixel is assigned at least one bit to indicate whether the pixel should reflect the background color or foreground color, or another color.

In the case of a text page in black and white, consider a letter. Composing many pixels that letter require a single data bit per pixel. Each pixel is either white or black: 1 from 0.

When a bitmap displays a color image, there will be several colors with different gradations of color and brightness. In this case each pixel might have 16, 24 O 48 information bits associated with it. The more bits, higher resolution and larger file.

Because bitmaps store as much information in their highest resolutions, they can compose very sharp images. But nevertheless, an image bitmap rescaled not well. If we expand the program using a graphic bitmap image freezes and appears as fog. If the image is reduced loses clarity.

Compression techniques are used to remove weight bitmap file, while maintaining as much information as to render a good image. One of these formats is 8-bit, GIF format, which uses a palette of only 256 colors. The advantage of this archive, It is that it generates a much less heavy file that can be enlarged or reduced with satisfactory results, because it uses lossless compression. The disadvantage is that it can not reproduce images faithfully containing more than 256 colors.

Images stored in bitmap (bmp) that need to be reduced greatly in size, They can be converted into JPEG. This is a format that loses information when compressed (lossy compression), and that can display more than 256 colors and gives a better result in imaging the GIF.

Since bitmap images pixel by pixel are built they can be easily edited. Zoom a raster graphics with any graphics program allows the user to add, remove or change the color of pixels indiviudal.


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