求位图转换源码：真彩图<->256色<->灰度图，推者有分

[pinel]

[pinel]

高手不多阿

[dongfa]

nBits是你想转换的颜色位数,
HDIB WINAPI PL_BmpToDIB(HBITMAP hBitmap, HPALETTE hPal, int nBits)
{
BITMAP bm;
BITMAPINFOHEADER bi;
LPBITMAPINFOHEADER lpbi;
DWORD dwLen;
HANDLE hDIB, h;
HDC hDC;
WORD biBits;

if(!hBitmap)
return NULL;

if(!GetObject(hBitmap, sizeof(bm), (LPSTR)&bm))
return NULL;
if (hPal == NULL)
hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);
biBits = bm.bmPlanes * bm.bmBitsPixel;
if (biBits <= 1)
biBits = 1;
else if (biBits <= 4)
biBits = 4;
else if (biBits <= 8)
biBits = 8;
else
biBits = 24;
if(nBits != -1)
{
if(nBits == 1 || nBits == 4 || nBits == 8 || nBits == 24)
{
biBits = nBits;
}
}
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = biBits;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwLen = bi.biSize + PL_PaletteSize((LPBYTE)&bi);

hDC = GetDC(NULL);
hPal = SelectPalette(hDC, hPal, FALSE);
RealizePalette(hDC);
hDIB = GlobalAlloc(GHND, dwLen);
if (!hDIB)
{
SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
return NULL;
}
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
*lpbi = bi;
GetDIBits(hDC, hBitmap, 0, (UINT)bi.biHeight, NULL, (LPBITMAPINFO)lpbi,
DIB_RGB_COLORS);
bi = *lpbi;
GlobalUnlock(hDIB);

if (bi.biSizeImage == 0)
bi.biSizeImage = WIDTHBYTES((DWORD)bm.bmWidth * biBits) * bm.bmHeight;
dwLen = bi.biSize + PL_PaletteSize((LPBYTE)&bi) + bi.biSizeImage;

if (h = GlobalReAlloc(hDIB, dwLen, 0))
hDIB = h;
else
{
GlobalFree(hDIB);
hDIB = NULL;
SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
return NULL;
}
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
if (GetDIBits(hDC, hBitmap, 0, (UINT)bi.biHeight, (LPSTR)lpbi +
(WORD)lpbi->biSize + PL_PaletteSize((LPBYTE)lpbi), (LPBITMAPINFO)lpbi,
DIB_RGB_COLORS) == 0)
{
GlobalUnlock(hDIB);
hDIB = NULL;
SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
return NULL;
}

bi = *lpbi;
GlobalUnlock(hDIB);
SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);

return (HDIB) hDIB;
}

转换灰度，可换算法：
double r = (double)(rgb[nIndex].rgbRed);
double g = (double)(rgb[nIndex].rgbGreen);
double b = (double)(rgb[nIndex].rgbBlue);
BYTE c = (BYTE)(r*0.29900 + g*0.58700 + b*0.11400);

[pinel]

谢谢!,我试试

[pinel]

sorry ,请提供 PL_PaletteSize（）函数或源程序: [e-mail] ，多谢！

[snlee]

study

[tuggfox]

关注

[tuggfox]

关注

[tuggfox]

关注

[pinel]

急死啦！谁帮我？？？

[pinel]

没人知道吗？

[cafecai]

我推

[pinel]

：　dongfa(阿东)　快来 加分拉

[dongfa]

已经给你发了，这是我在开发偷窥者时开发的一套库.请参考.

[xtky_limi]

旁听

[pinel]

dongfa(阿东)　:您太牛了，这个软件也正是我想要的，多谢多谢！！！

[dongfa]

谢谢，这个软件我早就发布了,源程序也早就开发了。其中还有一些BUG,现在也没有时间解决了。

[dongfa]

还有谁要，请到我的http://dongfa.yeah.net，有偷窥者的源程序,里面有我开发的PL lib

[pinel]

dongfa(阿东)　：看了你的主页，原来也在上海，有机会多交流

[dongfa]

好啊