灰度图像的保存？

yangyunlong 2006-08-04 10:47:05

有unsigned char *bBuf ,是256级灰度图像数据，已知width,height,请问如何将其保存位一个灰度的bmp,保存后的文件属性里[颜色表示：灰度级比特深度：8]

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pomelowu 2006-08-08

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http://www.yesky.com/322/195322.shtml

256色总是有调色版的。。。你可以读一幅属性为“[颜色表示：灰度级比特深度：8]”的256色位图的位图数据前的部分，和你写入的部分对比下，看看差距在什么地方

yangyunlong 2006-08-07

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我上次写了一个，当时存完发现保存后的文件属性里是 [颜色表示：调色比特深度：8]，而不是[颜色表示：灰度级比特深度：8]请各位帮忙看看。

BOOL SaveModel(CString strFileName, unsigned char *lpDIBBits, LONG lWidth, LONG lHeight)
{

BITMAPFILEHEADER bmfHdr;
CFile file;
if (!file.Open(strFileName, CFile::modeCreate |
CFile::modeReadWrite | CFile::shareExclusive, NULL))
{

return FALSE;
}
DWORD dwDIBSize;
BITMAPINFO* pBitmapInfo ;
pBitmapInfo = NULL ;
unsigned int bitmapInfoSize= 0 ;
unsigned short* palColorIx = NULL;
bitmapInfoSize = sizeof(BITMAPINFO)+ 255*sizeof(unsigned short);
pBitmapInfo = (BITMAPINFO *) new BYTE[bitmapInfoSize];
pBitmapInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pBitmapInfo->bmiHeader.biPlanes = 1;
pBitmapInfo->bmiHeader.biBitCount = 8;
pBitmapInfo->bmiHeader.biCompression = BI_RGB;
pBitmapInfo->bmiHeader.biSizeImage = 0 ;
pBitmapInfo->bmiHeader.biXPelsPerMeter= 0;
pBitmapInfo->bmiHeader.biYPelsPerMeter= 0;
pBitmapInfo->bmiHeader.biClrUsed = 0;
pBitmapInfo->bmiHeader.biClrImportant = 0;
pBitmapInfo->bmiHeader.biWidth = lWidth;
pBitmapInfo->bmiHeader.biHeight = lHeight;
palColorIx = (unsigned short*)&pBitmapInfo->bmiColors[0];
for (int i = 0 ; i < 256 ; i++)
palColorIx[i] = (unsigned short)i;
bmfHdr.bfType =((WORD) ('M' << 8) | 'B');

dwDIBSize =sizeof(BITMAPINFO)+ 255*sizeof(unsigned short)+ sizeof(PLOGPALETTE)+ 256 * sizeof(PALETTEENTRY);

DWORD dwBmBitsSize;

dwBmBitsSize = WIDTHBYTES(lWidth*8) * lHeight;
dwDIBSize += dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize + sizeof(BITMAPFILEHEADER);
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;

bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)+ sizeof(PLOGPALETTE)+ 256 * sizeof(PALETTEENTRY);

pBitmapInfo->bmiHeader.biSizeImage = dwBmBitsSize ;

unsigned int un32LoopI;
PLOGPALETTE pLogPalette;
pLogPalette = (PLOGPALETTE)new BYTE[sizeof(LOGPALETTE) + 256 * sizeof(PALETTEENTRY)];
pLogPalette->palNumEntries = 256;
pLogPalette->palVersion = 0x300;// version number defined by Windows (must be 0x300)
for (un32LoopI = 0 ; un32LoopI < 256 ; un32LoopI++)
{
pLogPalette->palPalEntry[un32LoopI].peRed = (BYTE)un32LoopI;
pLogPalette->palPalEntry[un32LoopI].peGreen = (BYTE)un32LoopI;
pLogPalette->palPalEntry[un32LoopI].peBlue = (BYTE)un32LoopI;
pLogPalette->palPalEntry[un32LoopI].peFlags = NULL;
}// 写文件头
file.Write((LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER));
file.Write((LPSTR)pBitmapInfo, sizeof(BITMAPINFOHEADER));
file.Write((LPSTR)pLogPalette, sizeof(PLOGPALETTE)+ 256 * sizeof(PALETTEENTRY));
file.WriteHuge(lpDIBBits, dwBmBitsSize);

return TRUE;

}