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Lecture Digital image processing - Lecture 24: Color Images

This chapter presents the following content: RGB color model, CMY model, HSI color model, pseudocolors image processing, full color image processing, color characteristics, chromaticity diagram and its use, color models, RGB color model. | Digital Image Processing CSC331 Color Image Processing 1 Summery of previous lecture Color image processing Primary and secondary colors Color characteristics Chromaticity diagram and its use Color models RGB color model 2 Todays lecture RGB color model CMY model HSI color model Pseudocolors image processing Full color image processing 3 Color model RGB model or red, green blue model image displays like monitor CMY model: cyan, magenta and yellow useful for image printer CMYK model: cyan, yellow magenta and black. useful for image printers HSI color model: hue, saturation and intensity or brightness application oriented or also, it is perception oriented. That is how we perceive a particular color 4 Color Models -- RGB Model RGB color model is based on Cartesian coordinate system Color Models -- RGB Model True color supports 24-bit for three RGB colors. It provides a method of representing and storing graphical-image information (especially in computer processing) in an RGB color space such that a very large number of colors, shades, and hues can be displayed in an image, such as in high-quality photographic images or complex graphics. Usually, true color is defined to mean 256 shades of red, green, and blue, for a total of 224 or 16,777,216 color variations. The human eye can discriminate up to ten million colors. 7 Safe RGB Color Cube Color Models -- RGB Model For most graphics images used for Internet applications, a set of 216 colors has been selected to represent “safe colors” which should be reliably displayed on computer monitors. Color Models -- CMY and CMYK Models Cyan, Magenta and Yellow model. An RGB to CMY conversion For CMYK black color is add HSI color model Hue It represents the dominant wavelength in a mixture of colors. So, when you look at a secondary color which is a mixture of different primary colors, there will be one wavelength which is a dominant one, dominant wavelength and the overall sensation of that particular secondary color will be | Digital Image Processing CSC331 Color Image Processing 1 Summery of previous lecture Color image processing Primary and secondary colors Color characteristics Chromaticity diagram and its use Color models RGB color model 2 Todays lecture RGB color model CMY model HSI color model Pseudocolors image processing Full color image processing 3 Color model RGB model or red, green blue model image displays like monitor CMY model: cyan, magenta and yellow useful for image printer CMYK model: cyan, yellow magenta and black. useful for image printers HSI color model: hue, saturation and intensity or brightness application oriented or also, it is perception oriented. That is how we perceive a particular color 4 Color Models -- RGB Model RGB color model is based on Cartesian coordinate system Color Models -- RGB Model True color supports 24-bit for three RGB colors. It provides a method of representing and storing graphical-image information (especially in computer processing) in an RGB color .