本文介绍了如何在c＃中获取Tiff图像迭代并获取Fomart32bppRgb，Format48bppRgb的Pixel值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
private byte[] GetRawBytesFromBmp(Bitmap bmp)
{
byte[] raw;
int row, column;
int width = bmp.Width;
int columnWidth = width / 4;
int height = bmp.Height;
if (height % 2 != 0 && width % 2 != 0)
{
width--;
}
int bmpStride = 0;
int rawStride = 0;
int BytesPerPixel = 0;
BitmapData data = null;
try
{
//Lock the bitmap so we can access the raw pixel data
// Lock the bitmap's bits.
data = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, bmp.PixelFormat);
bmpStride = data.Stride;
if (bmp.PixelFormat == PixelFormat.Format24bppRgb || bmp.PixelFormat == PixelFormat.Format8bppIndexed || bmp.PixelFormat==PixelFormat.Format32bppRgb)
{
BytesPerPixel = Image.GetPixelFormatSize(bmp.PixelFormat) / 8;
rawStride = BytesPerPixel * width;
}
else if (bmp.PixelFormat == PixelFormat.Format48bppRgb)
{
BytesPerPixel = Image.GetPixelFormatSize(bmp.PixelFormat) / 8;
rawStride = BytesPerPixel * width;
}
else
{
return null;
}
// Declare an array to hold the bytes of the bitmap.
raw = new byte[rawStride * height];
unsafe
{
// Get the address of the first line.
byte* bmpPtr = (byte*)data.Scan0.ToPointer();
fixed (byte* rawPtr = raw)
if (bmp.PixelFormat == PixelFormat.Format24bppRgb)
{
//the pixels row by row
for (row = 0; row < height; ++row)
{
for (column = 0; column < rawStride; column += BytesPerPixel)
{
// rawPtr[row * rawStride + column] = bmpPtr[row * bmpStride + column]; //b
// rawPtr[row * rawStride + column + 1] = bmpPtr[row * bmpStride + column + 1]; //g
// rawPtr[row * rawStride + column + 2] = bmpPtr[row * bmpStride + column + 2]; //r
rawPtr[row * rawStride + column] = bmpPtr[row * bmpStride + column + 2]; //b
rawPtr[row * rawStride + column + 1] = bmpPtr[row * bmpStride + column + 1]; //g
rawPtr[row * rawStride + column + 2] = bmpPtr[row * bmpStride + column]; ; //r
}
}
// SwapRedBlue(raw);
}
else if (bmp.PixelFormat == PixelFormat.Format8bppIndexed)
{
for (row = 0; row < height; ++row)
{
for (column = 0; column < rawStride; column += BytesPerPixel)
{
rawPtr[row * rawStride + column] = bmpPtr[row * bmpStride + column]; //r
}
}
}
else if (bmp.PixelFormat == PixelFormat.Format48bppRgb || bmp.PixelFormat == PixelFormat.Format32bppRgb)
{
//int PixelSize = 4;
for (row = 0; row < height; ++row)
{
// byte* row = (byte*)bmpdata.Scan0 + (y * bmpdata.Stride);
for (column = 0; column < rawStride; column += BytesPerPixel)
{
//rawPtr[row * rawStride + column] = rawPtr[row * bmpStride + column];//0; //Blue 0-255
//rawPtr[row * rawStride + column + 1] = rawPtr[row * bmpStride + column + 1];// 255; //Green 0-255
// rawPtr[row * rawStride + column + 2] = rawPtr[row * bmpStride + column + 2];//0; //Red 0-255
// rawPtr[row * rawStride + column + 3] = rawPtr[row * bmpStride + column + 3];//50; //Alpha 0-255
rawPtr[row * rawStride + column] = rawPtr[row * bmpStride + column];
rawPtr[row * rawStride + column] = bmpPtr[row * bmpStride + column + 2]; //b
rawPtr[row * rawStride + column + 1] = bmpPtr[row * bmpStride + column + 1]; //g
rawPtr[row * rawStride + column + 2] = bmpPtr[row * bmpStride + column]; ; //r
}
}
/*
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width * BytesPerPixel; x += BytesPerPixel)
{
int i = y * width * BytesPerPixel + x;
// Blue and Green components
// always 0x00 since we are just
// interested in red
rawPtr[i] = 0x00;
rawPtr[i + 1] = 0x00;
rawPtr[i + 2] = 0x00;
rawPtr[i + 3] = 0x00;
if (x < columnWidth * BytesPerPixel)
{
//Left most column, full red
rawPtr[i + 4] = 0xFF;
rawPtr[i + 5] = 0xFF;
}
else if (x < columnWidth * BytesPerPixel * 2)
{
//Next left, half red
rawPtr[i + 4] = 0x00;
rawPtr[i + 5] = 0xFF;
}
else if (x < columnWidth * BytesPerPixel * 3)
{
//Next left, other half red
rawPtr[i + 4] = 0xFF;
rawPtr[i + 5] = 0x00;
}
else
{
//Final column, no red
rawPtr[i + 4] = 0x00;
rawPtr[i + 5] = 0x00;
}
}
}
}
}
}
catch (Exception e)
{
return null;
}
finally
{
bmp.UnlockBits(data);
}
return raw;
}推荐答案
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