在C#中将位图转换为8bpp灰度输出为8bpp彩色索引,可以通过以下步骤实现:
Bitmap originalBitmap = (Bitmap)Image.FromFile("original.bmp");
Bitmap grayBitmap = new Bitmap(originalBitmap.Width, originalBitmap.Height, PixelFormat.Format8bppIndexed);
ColorPalette palette = grayBitmap.Palette;
for (int i = 0; i < 256; i++)
{
palette.Entries[i] = Color.FromArgb(i, i, i);
}
grayBitmap.Palette = palette;
using (Graphics gr = Graphics.FromImage(grayBitmap))
{
gr.DrawImage(originalBitmap, new Rectangle(0, 0, grayBitmap.Width, grayBitmap.Height));
}
Bitmap colorBitmap = new Bitmap(grayBitmap.Width, grayBitmap.Height, PixelFormat.Format8bppIndexed);
ColorPalette colorPalette = colorBitmap.Palette;
for (int i = 0; i < 256; i++)
{
colorPalette.Entries[i] = Color.FromArgb(i, i, i);
}
colorBitmap.Palette = colorPalette;
ColorMap[] colorMap = new ColorMap[256];
for (int i = 0; i < 256; i++)
{
colorMap[i] = new ColorMap();
colorMap[i].OldColor = Color.FromArgb(i, i, i);
colorMap[i].NewColor = Color.FromArgb(i, 0, 0);
}
ImageAttributes imageAttributes = new ImageAttributes();
imageAttributes.SetRemapTable(colorMap);
using (Graphics gr = Graphics.FromImage(colorBitmap))
{
gr.DrawImage(grayBitmap, new Rectangle(0, 0, colorBitmap.Width, colorBitmap.Height), 0, 0, colorBitmap.Width, colorBitmap.Height, GraphicsUnit.Pixel, imageAttributes);
}
colorBitmap.Save("output.bmp", ImageFormat.Bmp);
这样,你就可以将位图转换为8bpp灰度,并输出为8bpp彩色索引图像了。
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