本文受了 的啟發。
bmp的格式是rgbrgb.....排列下來的,每個畫素的三個分量靠在一起,描述完乙個畫素,接著描述下乙個畫素。
tif的格式更多樣。通常的格式也是bgrbgr.....(次序與bmp相反)排列下來的,但偶爾有一些tif檔案採用rrrrrr.......ggggg.........bbbbb.....的安排。還有的tif檔案內容是壓縮過的。。。。這裡我們只考慮三個顏色分量靠在一起的情況。
下面的例子是乙個tif檔案,寬896,高608,三個分量。這裡先把其內容取出,並交換rb的位置,然後儲存為.rgb檔案。再給這個rgb檔案加上頭,形成bmp。
#include#include#includeconst int cnst_iwidth = 896;//圖寬
const int cnst_iheight = 608;
const int cnst_ichan = 3;//rgb三通道
#pragma pack(2)
struct bmpheader
};//檔案頭
struct bmpinfo
};//資訊頭
int rgb2bmp(bmpheader*, bmpinfo*);
using namespace std;
const char*pathin = "earthrgbrgb.tif";
const char*pathout = "earth.rgb";
unsigned char*buffer = new unsigned char[12];
int main()
int offset = 0;//檔案目錄的偏移量
offset = (buffer[7] << 24) + (buffer[6] << 16) + (buffer[5] << 8) + buffer[4];
in.seekg(offset);
in.read((char*)buffer, 2);
unsigned int package_num = buffer[0] + (buffer[1] << 8);
class package
;//定義了目錄項
package*a= new package[package_num];
head.type = 0x4d42;
head.size = cnst_iwidth * cnst_iheight * cnst_ichan + 54;
head.offbit = 54;
info.size = 40;
for (int i = 0; i < package_num; i++)
for (int j = 0; j < 2; j++)
for (int j = 0; j < 4; j++)
if (a[i].tag_id[0]== 17&&a[i].tag_id[1]==01)
if (a[i].tag_id[0] ==23&&a[i].tag_id[1]==01)
unsigned int length = (a[i].data[3] << 24) + (a[i].data[2] << 16) + (a[i].data[1] << 8) + a[i].data[0];
unsigned char*data = new unsigned char[length];
in.seekg(off_img);
in.read((char*)data, length);
for (int i = 0; i < length; i = i + 3)
out.write((char*)data, length);
out.close();
in.seekg((i+1)*12+2+offset, ios::beg);
} }in.close();
rgb2bmp(&head, &info);
system("pause");
return 0;
}const char*pathbmp = "earthrgbrgb.bmp";
unsigned char*bufferrgb = new unsigned char[cnst_iwidth * cnst_iheight * cnst_ichan ];
int rgb2bmp(bmpheader*a,bmpinfo*b)
原tif檔案
新的bmp檔案:
兩圖上下翻轉,這是因為bmp把最底部一行的畫素放在檔案的前面,而最頂部的一行放在檔案後面。
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