hi!! this is the part of a code on which i m working and image is read in .pcx format.if i already define rows and coloums then it reads the image but if i use this command (fscanf(f,"%d %d",&cols,&rows);)then it just stuck up.so plzz help me out wid dis code!! #include <stdio.h> #include <math.h> #include <alloc.h> #include <mem.h> #include <dos.h> #include <conio.h> #include <process.h> #include <time.h> #include <stdlib.h> #include <ctype.h> #include <string.h> #include "oct1.h" int SaveAsPCX(FILE *fimg, OctreeType *octree, int resx, int resy, double nrgbr, double nrgbg, double nrgbb, int npal, RGBType *colortable); int npal = 256; void main(int argc, char *argv[]) { double r, g, b; uint rows, cols; char fname[256]; double colormag; time_t tstart, tend; int nrgbr = 63, nrgbg = 63, nrgbb = 63; OctreeType *octree; RGBType color; FILE *f; char title[40]; char description[128]; ulong i; uint j; int n; RGBType palette[256]; ulong image_start; union REGS regs; int resx, resy; int px, py; int ii; int cols2, rows2; int k; int cli; int maxr=0, maxg=0, maxb=0; printf("Image file : "); scanf("%s",fname); if ((f = fopen(fname,"rb")) == NULL) { printf("%s not found.\n",fname); exit(1); } /* ** Read the image file header */ fgets(title,40,f); fgets(description,128,f); fscanf(f,"%d %d",&cols,&rows); fscanf(f,"%lf",&colormag); image_start = ftell(f); cols2 = cols/2; rows2 = rows/2; time(&tstart); /* ** Initialize the color octree */ octree = CreateOctNode(0); /* ** Loop through the image and store each unique color. */ for (i = 0L; i < (ulong)rows*(ulong)cols; i++) { /* ** Show progress... */ if ((i % (ulong)cols) == 0L) printf("%ld\r",i/cols); fscanf(f,"%lf %lf %lf",&r,&g,&b); color.r = (unsigned char)(r * nrgbr); color.g = (unsigned char)(g * nrgbg); color.b = (unsigned char)(b * nrgbb); if (color.r > nrgbr) color.r = nrgbr; if (color.g > nrgbg) color.g = nrgbg; if (color.b > nrgbb) color.b = nrgbb; /* ** Insert this color into the octree */ InsertTree(&octree, &color, 0); /* ** If there are too many colors in the tree as a result of this ** insert, reduce the octree */ while (TotalLeafNodes() > npal) { ReduceTree(); } } /* ** Make a pass through the completed octree to average down the ** rgb components. When done, 'n' contains the actual number of ** colors in the palette table. */ n = 0; MakePaletteTable(octree, palette, &n); /* ** How long did it take? */ time(&tend); printf("Processed %ld pixels per second\ninto %d quantized colors\n", ((long)rows*(long)cols)/(tend-tstart), n); j = 0; while (j != 3) { printf("Output to (1)monitor or (2).PCX file or (3) quit: "); scanf("%s",title); j = atoi(title); if (j == 2) { fseek(f,image_start,0); SaveAsPCX(f, octree, cols, rows, nrgbr, nrgbg, nrgbb, npal, palette); } } }

if anyone know any other format to read image so plzzz tell me that

If you must create an image loader your self instead of using an existing library, I'd recommend the true type targa format (.tga).
It's simple (if you ignore compression) and very flexible IMO.
Most applications doesn't save compressed tga's so you don't need to support that, although the RLE compression in tga is fairly simple to implement.

Here's plenty of information about image file formats.

BTW: pcx is an ancient file format.. don't use it IMO.