sigmoidalcontrastImage(
$sigmoidalcontrast_sharpen,
$sigmoidalcontrast_contrast,
$sigmoidalcontrast_midpoint,
$channel );
}
$format = strtolower( $image->getimageformat() );
$path = "temp/$ID.$_SESSION[views].$format";
$frames = $image->getNumberImages();
if ( $frames > 1) { $image->writeImages("$path", TRUE); }
else { $image->writeImage("$path"); }
# save settings
$_SESSION[path] = $path;
$_SESSION[sigmoidalcontrast_contrast] = $sigmoidalcontrast_contrast;
$_SESSION[sigmoidalcontrast_midpoint] = $sigmoidalcontrast_midpoint;
header("location:display.php");
exit;
}
######### end sigmoidalcontrast
include("top.php");
?>
- Description
- Adjusts the contrast of an image with a non-linear sigmoidal contrast algorithm. Increase the contrast of the image using a sigmoidal transfer function without saturating highlights or shadows.
- Contrast
- Indicates how much to increase the contrast (0 is none; 3 is typical; 20 is pushing it)
- Mid-point
- Indicates where midtones fall in the resultant image (0 is white; 50 is middle-gray; 100 is black)
- Sharpen
- Check sharpen to increase the image contrast otherwise the contrast is reduced.
- Channel
- Color channel