Time taken to create new images from a wand
Posted: 2012-05-19T14:54:01-07:00
Hi everyone...
im trying to create individual sub-images of specific size from a single wand of whole image using magick_wand. The time taken to create sub-images is increasing each time an image is created.Can anyone tell me why? i will include my code that i have written here...i wrote two types of code one using magickcropimage and other is creating empty wand and filling in pixels in there...
Code using magick crop image
Code which creates empty wand each time
im trying to create individual sub-images of specific size from a single wand of whole image using magick_wand. The time taken to create sub-images is increasing each time an image is created.Can anyone tell me why? i will include my code that i have written here...i wrote two types of code one using magickcropimage and other is creating empty wand and filling in pixels in there...
Code using magick crop image
Code: Select all
for(i=0;i<v.height-v.sbimg_hgt+1;i=i+v.sbimg_hgt/2)
{
for(j=0;j<v.width-v.sbimg_wdt+1;j=j+v.sbimg_wdt/2)
{
MagickBooleanType status;
MagickCropImage(wand,v.sbimg_wdt,v.sbimg_hgt,i,j);
PixelIterator *new_iterator;
PixelWand **new_pixels;
new_iterator=NewPixelIterator(wand);
for(y=0;y<v.sbimg_hgt;y++)
{
new_pixels = PixelGetNextIteratorRow(new_iterator, &v.sbimg_wdt);
for(x=0;x<v.sbimg_wdt;x++)
{
int gx,gy,lx,ly,img_id;
gy=i+y;
gx=j+x;
img_id=round(gx/v.sbimg_wdt,1)+round(gy/v.sbimg_hgt,1)*(v.width/v.sbimg_wdt);
lx=gx%v.sbimg_wdt;
ly=gy%v.sbimg_hgt;
int t=loc(ly,lx,v.sbimg_wdt)+img_id*v.sbimg_pxl;
unsigned char r=new_data[t],g=new_data[t+1],b=new_data[t+2];
if((r!=pxl_data[t])&&(g!=pxl_data[t+1])&&(b!=pxl_data[t+2]))
{
char color[64];
sprintf(color,"rgb(%d,%d,%d)",r,g,b);
PixelSetColor(new_pixels[x],color); // this function sets the color of pixel.
PixelSyncIterator(new_iterator);
}
}
}
char *str1=argv[6],*str2=".png",final_str[50];
sprintf(final_str,"%s_%d%s",str1,a,str2);
printf(" %s\n",final_str);
status=MagickWriteImages(wand,final_str,MagickTrue);
if (status == MagickFalse)
{
printf ("status problem");
}Code: Select all
for(i=0;i<v.height-v.sbimg_hgt+1;i=i+v.sbimg_hgt/2)
{
for(j=0;j<v.width-v.sbimg_wdt+1;j=j+v.sbimg_wdt/2)
{
MagickWand *image;
MagickBooleanType status;
MagickWandGenesis(); // to initialize the magick-wand Environment
image=NewMagickWand(); // To create the wand to store image
MagickSetSize(image,v.sbimg_wdt,v.sbimg_hgt);
status = MagickReadImage(image, "xc:none" );
if (status == MagickFalse)
printf ("status problem");
PixelIterator *new_iterator;
PixelWand **new_pixels;
new_iterator=NewPixelIterator(image);
for(y=0;y<v.sbimg_hgt;y++)
{
new_pixels = PixelGetNextIteratorRow(new_iterator, &v.sbimg_wdt);
for(x=0;x<v.sbimg_wdt;x++)
{
int gx,gy,lx,ly,img_id;
gy=i+y;
gx=j+x;
img_id=round(gx/v.sbimg_wdt,1)+round(gy/v.sbimg_hgt,1)*(v.width/v.sbimg_wdt);
lx=gx%v.sbimg_wdt;
ly=gy%v.sbimg_hgt;
//printf("%d,%d :",y,x);
int t=loc(ly,lx,v.sbimg_wdt)+img_id*v.sbimg_pxl;
//printf("%d,%d\n",a,t);
//getchar();
unsigned char r=new_data[t],g=new_data[t+1],b=new_data[t+2];
char color[64];
sprintf(color,"rgb(%d,%d,%d)",r,g,b);
PixelSetColor(new_pixels[x],color); // this function sets the color of pixel.
PixelSyncIterator(new_iterator);
}
}