Color Models.pptx
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RGB, CMYK, HSV, and YIQ are common color models. RGB represents colors as combinations of red, green, and blue. It is additive and used in computer graphics. CMYK is subtractive and represents colors as combinations of cyan, magenta, yellow, and black, and is used in printing. HSV represents colors in a hexacone using hue, saturation, and value. YIQ was used in broadcasting and separates luminance and chrominance information.
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Please Note: This is a class teaching PPT, more and detail topics were covered in the classroom.
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Here in the ppt a detailed description of Image Enhancement Techniques is given which includes topics like Basic Gray level Transformations,Histogram Processing.
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image averaging and image averaging methods.
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its very useful for students.
Sharpening process in spatial domain
Direct Manipulation of image Pixels.
The objective of Sharpening is to highlight transitions in intensity
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Since averaging is analogous to integration.
Prepared by
M. Sahaya Pretha
Department of Computer Science and Engineering,
MS University, Tirunelveli Dist, Tamilnadu.
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Digital Image Processing denotes the process of digital images with the use of digital computer. Digital images are contains various types of noises which are reduces the quality of images. Noises can be removed by various enhancement techniques. Image smoothing is a key technology of image enhancement, which can remove noise in images.
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(1) Spatial filtering is defined as operations performed on pixels within a neighborhood of an image using a mask or kernel. (2) Filters can be used to blur/smooth an image by reducing noise or sharpen an image by enhancing edges. (3) Common linear filtering methods include averaging, Gaussian, and derivative filters which are implemented using various mask patterns to modify pixels in the filtered image.
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(3) Hue, saturation, and value are the key properties used to describe any color, along with color temperature (warm vs. cool colors).
Color models
This document discusses color models and color spaces. It defines color models as specifications for representing colors as points within a coordinate system. Common color models include RGB, grayscale, and binary. It describes how human vision perceives color through red, green, and blue cone receptors in the eye. Hue, saturation, and brightness are also defined as the three properties that describe color, with hue being the actual color, saturation being the purity of the color, and brightness being the relative intensity.
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- 2. Introduction to Color Spaces • Color spaces are the mathematical representation of a set of colors. • There are many color models. • Some of them are RGB, CMYK, YIQ, HSV, and HLS, etc. • These color spaces are directly related to saturation and brightness. • All of these color spaces can be derived using RGB information using devices such as cameras and scanners.
- 3. RGB Color Space • RGB stands for Red, Green, and Blue. This color space is widely used in computer graphics. RGB are the main colors from which many colors can be made. • RGB can be represented in the 3-dimensional form:
- 4. RGB Color Space Properties: • This is an additive colour model. The colours are added to the black. • 3 main channels: Red, Green and Blue. • Used in DIP, openCV and online logos.
- 5. RGB Color Space • Color bar contains values for 100% amplitude, 100% saturated, and for video test signal.
- 6. CMYK Color Model • CMYK stands for Cyan, Magenta, Yellow and Black. • CMYK color model is used in electrostatic and ink-jet plotters which deposits the pigmentation on paper. • In these model, specified color is subtracted from the white light rather than adding blackness. • It follows the Cartesian coordinate system and its subset is a unit cube.
- 7. CMYK Color Model • It is a subtractive colour model. • 0 represents the primary colour and 1 represents the lightest colour. In this model, point (1, 1, 1) represents black, and (0,0,0) represents white. • It is a subtractive model thus the value is subtracted from 1 to vary from least intense to a most intense colour value.
- 9. HSV Color Model • HSV stands for Hue, Saturation, and Value (brightness). • It is a hexcone subset of the cylindrical coordinate system. • The human eye can see 128 different hues, 130 different saturations and number values between 16 (blue) and 23 (yellow).
- 10. HSV Color Model
- 11. HSV Color Model
- 12. HSV Color Model
- 13. YIQ Color Model • YIQ is the most widely colour model used in Television broadcasting. • Y stands for luminance part and IQ stands for chrominance part. • In the black and white television, only the luminance part (Y) was broadcast. • The y value is similar to the grayscale part. The colour information is represented by the IQ part. • There exist a formula to convert RGB into YIQ and vice-versa.
- 14. YIQ Color Model (Conversion matrix) YIQ model is used in the conversion of grayscale images to RGB colour images.