Logo ROOT   6.21/01
Reference Guide
galaxy_image.C File Reference

Detailed Description

View in nbviewer Open in SWAN Importing an image and manipulating it.

image_galaxy_image.png
void galaxy_image()
{
TCanvas *canv = new TCanvas("image", "n4254", 40, 40, 812, 700);
canv->SetRightMargin(0.2);
canv->SetLeftMargin(0.01);
canv->SetTopMargin(0.01);
canv->SetBottomMargin(0.01);
// read the pixel data from file "galaxy.root"
// the size of the image is 401 X 401 pixels
const char *fname = "galaxy.root";
TFile *gal = 0;
if (!gSystem->AccessPathName(fname)) {
gal = TFile::Open(fname);
} else {
printf("accessing %s file from http://root.cern.ch/files\n",fname);
gal = TFile::Open(Form("http://root.cern.ch/files/%s",fname));
}
if (!gal) return;
TImage *img = (TImage*)gal->Get("n4254");
img->Draw();
// open the color editor
// zoom the image
img->Zoom(80, 80, 250, 250);
}
Author
Valeriy Onuchin

Definition in file galaxy_image.C.