adaptivethresholdImage ( $adaptivethreshold_width, $adaptivethreshold_height, $adaptivethreshold_offset );
}
$format = strtolower( $image->getimageformat() );
$path = "temp/$ID.$_SESSION[views].$format";
$_SESSION[path] = $path;
$_SESSION[adaptivethreshold_width] = $adaptivethreshold_width;
$_SESSION[adaptivethreshold_height] = $adaptivethreshold_height;
$_SESSION[adaptivethreshold_offset] = $adaptivethreshold_offset;
$frames = $image->getNumberImages();
if ( $frames > 1) { $image->writeImages("$path", TRUE); }
else { $image->writeImage("$path"); }
# save settings
header("location:display.php");
exit;
} ######### end Adaptive Threshold #########
############ Threshold ###########
if ( $_GET[threshold] || $_GET[blackthreshold] || $_GET[whitethreshold] )
{
## validate color
$threshold_color = trim($_GET[threshold_color] );
$threshold_color = colors( $threshold_color, "validate" );
if ( !$threshold_color )
{
$_SESSION[error] = "Color is invalid";
header("location:$self");
exit;
}
## end validate
$image = new Imagick($_SESSION[path]);
if ( $_GET[blackthreshold] || $_GET[threshold] )
{
foreach ($image as $frame)
{ $frame->blackthresholdImage( $threshold_color ); }
}
if ( $_GET[whitethreshold] || $_GET[threshold] )
{
foreach ($image as $frame)
{ $frame->whitethresholdImage( $threshold_color ); }
}
$format = strtolower( $image->getimageformat() );
$path = "temp/$ID.$_SESSION[views].$format";
$_SESSION[path] = $path;
$_SESSION[threshold_color] = $threshold_color;
$frames = $image->getNumberImages();
if ( $frames > 1) { $image->writeImages("$path", TRUE); }
else { $image->writeImage("$path"); }
# save settings
header("location:display.php");
exit;
header("Location: display.php");
exit;
} ################ End Threshold ###########
include("top.php");
?>
Enter a threshold color. Color can be a named color or hex. Examples: red, #0000ff
- Threshold
- Create a high contrast, two tone image divided by the threshold color.
- Black Threshold
- Forces all pixels below the threshold color into black while leaving all pixels above the threshold unchanged.
- White Threshold
- Forces all pixels above the threshold color into white while leaving all pixels below the threshold unchanged,
- Adaptive Threshold
- Selects an individual threshold for each pixel based on the range of intensity values in its local neighborhood. This allows for thresholding of an image whose global intensity histogram doesn't contain distinctive peaks.
- Parameters:
-
- Width
- Width of the local neighborhood.
- Height
- Height of the local neighborhood.
- Offset
- The mean offset.