c语言rgb转bmp,用c语言把bmp格式的彩色图片转换成黑白的

ゞ浴缸里的玫瑰 2022-10-15 01:52 216阅读 0赞

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\#include

typedef unsigned char BYTE;

\#define RGB 3.0

\#define MAX 255.0

struct BitMap

short Type;

long Size;

short Reserve1;

short Reserve2;

long Offset;

long FileSize;

long Width;

long Height;

short ClrPlanes;

short BitsPerPix;

long Compression;

long ImSize;

long XPixPerMeter;

long YPixPerMeter;

long ClrTBClr;

long ImpClr;

\} Header;

typedef struct

BYTE Blue;

BYTE Green;

BYTE Red;

\} \_\_attribute\_\_((\_\_packed\_\_))

RGBTRIPLE;

int main(int argc, char \*\*argv) \{

FILE \*inptr, \*outptr;

float threshold;

threshold = atoi(argv\[2\]);

if(argc < 3) \{

printf("Usage : ./a.out threshold\\n");

exit(0);

else inptr = fopen(argv\[1\], "rb");

outptr = fopen ("out.bmp", "wb");

memset(&Header, 0, sizeof(Header));

fread(&Header.Type, 2, 1, inptr);

fwrite(&Header.Type, 2, 1, outptr);

fread(&Header.Size, 4, 1, inptr);

fwrite(&Header.Size, 4, 1, outptr);

fread(&Header.Reserve1, 2, 1, inptr);

fwrite(&Header.Reserve1, 2, 1, outptr);

fread(&Header.Reserve2, 2, 1, inptr);

fwrite(&Header.Reserve2, 2, 1, outptr);

fread(&Header.Offset, 4, 1, inptr);

fwrite(&Header.Offset, 4, 1, outptr);

fread(&Header.FileSize, 4, 1, inptr);

fwrite(&Header.FileSize, 4, 1, outptr);

fread(&Header.Width, 4, 1, inptr);

fwrite(&Header.Width, 4, 1, outptr);

fread(&Header.Height, 4, 1, inptr);

fwrite(&Header.Height, 4, 1, outptr);

fread(&Header.ClrPlanes, 2, 1, inptr);

fwrite(&Header.ClrPlanes, 2, 1, outptr);

fread(&Header.BitsPerPix, 2, 1, inptr);

fwrite(&Header.BitsPerPix, 2, 1, outptr);

fread(&Header.Compression, 4, 1, inptr);

fwrite(&Header.Compression, 4, 1, outptr);

fread(&Header.ImSize, 4, 1, inptr);

fwrite(&Header.ImSize, 4, 1, outptr);

fread(&Header.XPixPerMeter, 4, 1, inptr);

fwrite(&Header.XPixPerMeter, 4, 1, outptr);

fread(&Header.YPixPerMeter, 4, 1, inptr);

fwrite(&Header.YPixPerMeter, 4, 1, outptr);

fread(&Header.ClrTBClr, 4, 1, inptr);

fwrite(&Header.ClrTBClr, 4, 1, outptr);

fread(&Header.ImpClr, 4, 1, inptr);

fwrite(&Header.ImpClr, 4, 1, outptr);

// iterate over infile's scanlines

int i,j;

if (Header.Compression!=24) \{

printf("Error: This program only deals with 24 compressed bmp file\\n");

return 1;

if (threshold <0 || threshold >1.0) \{

printf("Error: Threshold value is not valid\\n");

return 1;

else for (i=0; i

// iterate over pixels in scanline

for (j=0; j

// temporary storage

RGBTRIPLE triple, tripleout;

int sum = 0;

// read RGB triple from infile

fread(&triple, sizeof(RGBTRIPLE), 1, inptr);

sum = triple.Red+triple.Green+triple.Blue;

float ratio = sum/(RGB\*MAX);

printf("(%d, %d, %d)\\n", triple.Red, triple.Green, triple.Blue);

// prints rgb values for each pixel (used to check if the colours were right)

printf("ratio is: %f\\n", ratio);

// gives the ratio

if (ratio

tripleout.Red = 0;

tripleout.Green = 0;

tripleout.Blue = 0;

// this part needs to be done

else \{

tripleout.Red = 255;

tripleout.Green = 255;

tripleout.Blue = 255;

// write RGB triple to outfile

fwrite(&tripleout, sizeof(RGBTRIPLE), 1, outptr);

fclose(inptr);

fclose(outptr);

return 0;

/\* To use compile: gcc -Wall -o check2 check2.c

After compiling

./check filename.bmp thresholdvalue

\*/

c语言rgb转bmp,用c语言把bmp格式的彩色图片转换成黑白的

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