网络多媒体报告.doc

网络多媒体技术（双语）课程报告题目： 色彩空间的转换 姓名： 刘小艳 学号： 081006315 日期： 2010年10月26日 色彩空间的转换色彩空间，也称作色彩模型，是数学化描述色彩的基础。我们经常用到的色彩空间主要有RGB颜色空间，CMY/CMYK颜色空间，HSV/HSB颜色空间，CIE系列颜色空间等等。由于不同色彩空间的属性存在很大差别，因而应用方向也会有所不同。在很多情况下需要在不同的色彩模型之间进行转换。在此介绍下RGB和HSV之间的互转方法。一、 将RGB转换到HSV的方法先将R，G，B归一化，R，G，B0,1,且将变换后的H的取值范围设为003600 ，S，V0,1，则RGB到HSV的变换公式为： 其中 二、 将HSV转换到RGB的方法同样，将R，G，B归一化，R，G，B0,1，且将变换后的H的取值范围设为003600 ，S，V0,1，则HSV到RGB的变换公式为：if S=0,then R=G=B=Vif S0,then 其中 其中 依据上述原理，制作出能实现R，G，B三色与H，S，V三色相互转换的功能的调色板。实现的具体过程：一、创建一个基于对话框的MFC应用程序“Color”。二、依照图示在对话框中添加控件，将对话框名改为ColorPicker 对控件的属性及关联变量进行设置（按从左到右，从上到下的顺序）:1、三个图片控件从左到右，从上到下依次为：资源ID关联变量类型关联变量名称IDC_COLOR_AREACStaticm_ColorAreaIDC_COLOR_BANDCStaticm_ColorBandIDC_COLOR_PREVCStaticm_ColorPrev2、四个滑块控件：资源ID关联变量类型关联变量名称IDC_SLIDER_COLORCSliderCtrlm_SliderColorIDC_SLIDER_REDintm_nSliderRedIDC_SLIDER_GREENintm_nSliderGreenIDC_SLIDER_BLUEintm_nSliderBlue 3、六个文本框控件：资源ID关联变量类型关联变量名称IDC_EDIT_REDintm_nRedIDC_EDIT_GREENintm_nGreenIDC_EDIT_BLUEintm_nBlueIDC_EDIT_Hintm_nHIDC_EDIT_Sintm_nSIDC_EDIT_Vintm_nV三、具体代码的实现 1、ColorDlg.h的代码中添加公有函数void DrawColorBand(void);/ 绘制颜色框void UpDateColorArea(void);/ 更新颜色面板的颜色void UpdateRGB(void);/ 将HSV转换为RGB,并更新对应数据void UpdateHSV(void);/ 将RGB转换为HSV,并更新对应数据void UpdatePrev(void);/ 更新颜色预览框void OnSliderColorChange(void);/ 滑块滑动的消息响应函数virtual BOOL PreTranslateMessage(MSG* pMsg);/ 屏幕取色处理函数/消息响应函数afx_msg void OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);/ 滑块滑动的消息响应函数/ 滑块滑动的消息响应函数afx_msg void OnLButtonDown(UINT nFlags, CPoint point);/ 按下鼠标左键的响应函数/ 按下鼠标左键的响应函数/ 按下鼠标左键的响应函数afx_msg void OnEnChangeEditRed();/ 红色文本框内容改变的响应函数afx_msg void OnEnChangeEditGreen();/ 绿色文本框内容改变的响应函数afx_msg void OnEnChangeEditBlue();/ 蓝色文本框内容改变的响应函数afx_msg void OnEnChangeEditH();/ H文本框内容改变的响应函数afx_msg void OnEnChangeEditS();/ S文本框内容改变的响应函数afx_msg void OnEnChangeEditV();/ V文本框内容改变的响应函数：2、ColorDlg.cpp中的添加代码：在BOOL CColorDlg:OnInitDialog()中添加：/ 改变窗口大小m_ColorArea.SetWindowPos(NULL, 0, 0, 256, 256, SWP_NOMOVE);m_ColorBand.SetWindowPos(NULL, 0, 0, 256, 40, SWP_NOMOVE);m_SliderColor.SetWindowPos(NULL, 0, 0, 268, 20, SWP_NOMOVE);/ 设置滑块取值范围m_SliderColor.SetRange(0, 1535);(CSliderCtrl*)GetDlgItem(IDC_SLIDER_RED)-SetRange(0, 255);(CSliderCtrl*)GetDlgItem(IDC_SLIDER_GREEN)-SetRange(0, 255);(CSliderCtrl*)GetDlgItem(IDC_SLIDER_BLUE)-SetRange(0, 255);在void CColorDlg:OnPaint()中添加：DrawColorBand();/ 绘制颜色框UpDateColorArea();/ 更新颜色面板的颜色添加公有函数的具体函数实现：/*作用:绘制颜色框*/void CColorDlg:DrawColorBand(void)/ 获取颜色框CDCCDC* pDC = m_ColorBand.GetDC();CPen* oldPen = NULL;int i;int k = 0;for (i = 0; i SelectObject(&pen);pDC-MoveTo(k, 0);pDC-LineTo(k, 40);for (i = 252; i = 0; i -= 6)CPen pen(PS_SOLID, 1, RGB(i, 0, 255);pDC-SelectObject(&pen);pDC-MoveTo(k, 0);pDC-LineTo(k, 40);k+;for (i = 6;i SelectObject(&pen);pDC-MoveTo(k, 0);pDC-LineTo(k, 40);k+;for (i = 252; i = 0; i -= 6)CPen pen(PS_SOLID, 1, RGB(0, 255, i);pDC-SelectObject(&pen);pDC-MoveTo(k, 0);pDC-LineTo(k, 40);k+;for (i = 6; i SelectObject(&pen);pDC-MoveTo(k, 0);pDC-LineTo(k, 40);k+;for (i = 252; i = 0; i -= 6)CPen pen(PS_SOLID, 1, RGB(255, i, 0);pDC-SelectObject(&pen);pDC-MoveTo(k, 0);pDC-LineTo(k, 40);k+;pDC-SelectObject(oldPen);/*作用:更新颜色面板的颜色*备注:以红,绿,蓝当前的取值为依据,更新面板*/void CColorDlg:UpDateColorArea(void)UpdateData(TRUE);CDC*pDC = m_ColorArea.GetDC();/ 颜色面板的CDCCDCmemDC;/ 内存CDCCBitmap bitmap;/ 内存位图BITMAPinfoBitmap;/ 位图信息结构体/ 创建内存CDCmemDC.CreateCompatibleDC(pDC);/ 创建设备相关位图bitmap.CreateCompatibleBitmap(pDC, 256, 256);/ 获得位图信息bitmap.GetBitmap(&infoBitmap);/ 是否支持32位颜色if (infoBitmap.bmBitsPixel != 32)MessageBox(当前显示设备不支持32位颜色,程序自动退出!);PostMessage(WM_QUIT);BYTE* pixels = new BYTE256 * 256 * 4;/ 32位颜色点阵数组int rForRow, gForRow, bForRow, rForColumn, gForColumn, bForColumn;for(int y = 0; y 256; y+)rForRow = m_nRed - (m_nRed * y / 255);gForRow = m_nGreen - (m_nGreen * y / 255);bForRow = m_nBlue - (m_nBlue * y / 255);for(int x = 0; x BitBlt(0, 0, 256, 256, &memDC, 0, 0, SRCCOPY);ReleaseDC(pDC);#define SAFE_DELETE_ARRAY(p)delete(p);(p)=NULL;SAFE_DELETE_ARRAY (pixels);/ 更新颜色预览框UpdatePrev();/*作用:将RGB转换为HSV,并更新对应数据*/void CColorDlg:UpdateHSV(void)UpdateData(TRUE);float R = m_nRed / 255.0f;float G = m_nGreen / 255.0f;float B = m_nBlue / 255.0f;float H = 0.0f;float S = 0.0f;float V = 0.0f;float RGBmax = max( max( R ,G ),B ) ;float RGBmin = min( min( R ,G ),B ) ;V = RGBmax * 100;if(RGBmax != RGBmin)S = (float)(RGBmax - RGBmin) / RGBmax) * 100;if (R = RGBmax)H = (G - B) / (RGBmax - RGBmin);if (G = RGBmax)H = 2 + (B - R) / (RGBmax - RGBmin);if (B = RGBmax)H = 4 + (R - G) / (RGBmax - RGBmin);H = H * 60;if (H FillRect(rect, &brush); / 利用当前RGB颜色填充颜色预览框ReleaseDC(pDC); / 释放CDC指针/*作用:滑块滑动的消息响应函数*备注:对话框面板中所有滑块滑动都由该函数处理*/void CColorDlg:OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)UpdateData(TRUE);if ( (&m_SliderColor) = (CSliderCtrl*)pScrollBar )OnSliderColorChange();else if ( (CSliderCtrl*)GetDlgItem(IDC_SLIDER_RED) = (CSliderCtrl*)pScrollBar )m_nRed = m_nSliderRed;else if ( (CSliderCtrl*)GetDlgItem(IDC_SLIDER_GREEN) = (CSliderCtrl*)pScrollBar )m_nGreen = m_nSliderGreen;else if ( (CSliderCtrl*)GetDlgItem(IDC_SLIDER_BLUE) = (CSliderCtrl*)pScrollBar )m_nBlue = m_nSliderBlue;UpdateData(FALSE);/ 滑块改动的是RGB值,要重新更新HSV值UpdateHSV();UpDateColorArea();CDialog:OnHScroll(nSBCode, nPos, pScrollBar);/*作用:主滑块滑动处理函数*/void CColorDlg:OnSliderColorChange(void)switch(m_SliderColor.GetPos() / 256)case 0:m_nRed = m_nSliderRed = 255;m_nGreen = m_nSliderGreen = 0;m_nBlue = m_nSliderBlue = m_SliderColor.GetPos();break;case 1:m_nRed = m_nSliderRed = 255 -(m_SliderColor.GetPos() - 256);m_nGreen = m_nSliderGreen = 0;m_nBlue = m_nSliderBlue = 255;break;case 2:m_nRed = m_nSliderRed = 0;m_nGreen = m_nSliderGreen = m_SliderColor.GetPos() - 256 * 2;m_nBlue = m_nSliderBlue = 255;break;case 3:m_nRed = m_nSliderRed = 0;m_nGreen = m_nSliderGreen = 255;m_nBlue = m_nSliderBlue = 255 - (m_SliderColor.GetPos() - 256 * 3);break;case 4:m_nRed = m_nSliderRed = m_SliderColor.GetPos() - 256 * 4;m_nGreen = m_nSliderGreen = 255;m_nBlue = m_nSliderBlue = 0;break;case 5:m_nRed = m_nSliderRed = 255;m_nGreen = m_nSliderGreen = 255 - (m_SliderColor.GetPos() - 256 * 5);m_nBlue = m_nSliderBlue = 0;break;default:;UpdateData(FALSE);/*作用:红色文本框内容改变的响应函数*/void CColorDlg:OnEnChangeEditRed()UpdateData(TRUE);/ 限定取值范围if (m_nRed 255)m_nRed = 255;else if (m_nRed 255)m_nGreen = 255;else if (m_nGreen 255)m_nBlue = 255;else if (m_nBlue 360)m_nH = 360;else if (m_nH 100)m_nS = 100;else if (m_nS 100)m_nV = 100;else if (m_nV GetPixel(x, y);m_nSliderRed = m_nRed = GetRValue(clr);m_nSliderGreen = m_nGreen = GetGValue(clr);m_nSliderBlue = m_nBlue = GetBValue(clr);UpdateData(FALSE);UpdateHSV();UpdatePrev();ReleaseDC(pDC);/*作用:屏幕取色处理函数*备注:用户按a键时响应*/BOOL CColorDlg:PreTranslateMessage(MSG* pMsg)/ 如果用户按下a键(不论大小写),进行屏幕取色处理if(pMsg-message = WM_KEYDOWN & (pMsg-wParam = a | pMsg-wParam = A)CDC* pDC = CDC:FromHandle(:GetDC(NULL); /获取屏幕CDC指针CPoint point;GetCursorPos(&point);/