Bit depth: is used to describe the number of bits used to determine the colour of a single pixel. The exact colour of a pixel is a blend of the three components of the colour spectrum, RGB (Red, Green, and Blue). The number of bits that are used to represent each pixel determines how many colours or shades of grey will be displayed in the image. For example in 8-bit images, the colour monitor uses 8-bits of information for each pixel; this makes it able to display 2 to 8th power different colours or shade of grey. Allowing it to display 256 colours. There are many bit-depths/colour-depths that can be used for images. These are: 1-bit monochrome, 8-bit grayscale, 8-bit colour (Known as 256-Colour mode), 15 or 16-bit colour (known as high colour), 24-bit colour (known as true colour), 30, 36 or 48-bit colour (known as deep colour). It can be measured by BPP (Bits Per Pixel), the value which indicates how many bits have been used in an image.
http://www.kirupa.com/images/rgb_image.png
Bit depth refers to all of the colour information stored in a single image. The higher the bit depth of an image, allowing it to store more colours. A 1 bit image only shows two colours, black and white. Whereas an 8 bit image can store 256 colours and a 24 bit image can store around 16 million colours. The resolution of an image affects the file size as well as the bit depth drastically affects it as well.
High colour only uses two bytes of information. This is done by splitting the 16 bits up, 5 bits for blue, 5 bits for red and 6 bits for green. This results in 32 different variations of blue and red but 64 for green. This means there is a slight loss of image quality because of the reduced colour precision. High colour is sometimes used instead of true colour because it uses less video memory and the file sizes are smaller compared to true colour which takes up more.
True colour is given its name because it uses 3 bytes of information, one for each blue, red and green to make up each pixel in an image. A byte has 256 different values; this means that each colour can have 256 different variations of that colour. This allows for over 16 million different colours to be used. This allows graphic designers to be able to create realistic looking images. This is because the 16 million colours that can be used is more than the human eye can see. True colour is a necessity for high quality work, such as photo editing, graphic design, etc. However one downside to it is the amount of video memory it takes up.
http://www.kirupa.com/images/rgb_image.png
Bit depth refers to all of the colour information stored in a single image. The higher the bit depth of an image, allowing it to store more colours. A 1 bit image only shows two colours, black and white. Whereas an 8 bit image can store 256 colours and a 24 bit image can store around 16 million colours. The resolution of an image affects the file size as well as the bit depth drastically affects it as well.
High colour only uses two bytes of information. This is done by splitting the 16 bits up, 5 bits for blue, 5 bits for red and 6 bits for green. This results in 32 different variations of blue and red but 64 for green. This means there is a slight loss of image quality because of the reduced colour precision. High colour is sometimes used instead of true colour because it uses less video memory and the file sizes are smaller compared to true colour which takes up more.
True colour is given its name because it uses 3 bytes of information, one for each blue, red and green to make up each pixel in an image. A byte has 256 different values; this means that each colour can have 256 different variations of that colour. This allows for over 16 million different colours to be used. This allows graphic designers to be able to create realistic looking images. This is because the 16 million colours that can be used is more than the human eye can see. True colour is a necessity for high quality work, such as photo editing, graphic design, etc. However one downside to it is the amount of video memory it takes up.
No comments:
Post a Comment