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Color Models

Color Models. Ku-Yaw Chang canseco@mail.dyu.edu.tw Assistant Professor, Department of Computer Science and Information Engineering Da-Yeh University. Outline. Color models Color Images C***Document & C***View Tools library. Color Models.

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Color Models

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  1. Color Models Ku-Yaw Chang canseco@mail.dyu.edu.tw Assistant Professor, Department of Computer Science and Information Engineering Da-Yeh University Color Models

  2. Outline • Color models • Color Images • C***Document & C***View • Tools library Color Models

  3. Color Models • To facilitate the specification of colors in some standard • Hardware-oriented • RGB: color monitors • CYM: printers • YIQ: TV broadcast • Application-oriented • HSI: color image manipulation • HSV: color image manipulation Color Models

  4. RGB Color Model B (0,0,1) Blue Cyan Magenta White GrayScale (0,1,0) Black G Green (1,0,0) Red Yellow R Color Models

  5. YIQ • Used for commercial color TV broadcasting • Compatibility with monochrome TV standards • Take advantage of human visual system’s greater sensitivity to changes in luminance • Y (luminance) • The amount of light perceived by the eye • IQ (color information) Color Models

  6. RGB to YIQ • Y = 0.299 R + 0.587 G + 0.114 B • I = 0.596 R - 0.275 G – 0.321 B • Q = 0.212 R – 0.523 G + 0.311 B Color Models

  7. Add data short * m_p2BImage; unsigned char * m_p1BImage; unsigned char * m_pRedImage; unsigned char * m_pGreenImage; unsigned char * m_pBlueImage; int m_nWidth; int m_nHeight; C***Document Color Models

  8. Add core functions short * Get2BImageBuffer(); unsigned char * Get1BImageBuffer(); unsigned char * GetRedImageBuffer(); unsigned char * GetGreenImageBuffer(); unsigned char * GetBlueImageBuffer(); int GetImageWidth(); int GetImageHeight(); C***Document Color Models

  9. C***View • #include “tools.h” • C***View::OnDraw(CDC * pDC){ int nWidth = pDoc->GetImageWidth(); int nHeight = pDoc->GetImageHeight(); ShowImage_1B(pDC, pDoc->Get1BImageBuffer(), nWidth, nHeight ); ShowImage_2B(pDC, pDoc->Get2BImageBuffer(), nWidth, nHeight, nWidth, 0 ); ShowImage_3B(pDC, pDoc->GetRedImageBuffer(), pDoc->GetGreenImageBuffer(), pDoc->GetBlueImageBuffer(), nWidth, nHeight, 0, nHeight);} Color Models

  10. Tools Library • Providing functions of displaying images • 1-byte • void ShowImage_1B(CDC * pDC, unsigned char * pImage, int nWidth, int nHeight); • 2-byte • void ShowImage_2B(CDC * pDC, short * pImage, int nWidth, int nHeight); • 3-byte • void ShowImage_3B(CDC * pDC, unsigned char * pRedImage, unsigned char * pGreenImage, unsigned char * pBlueImage, int nWidth, int nHeight); Color Models

  11. Results Color Models

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