Topics   All   MacOS (Only)   Windows (Only)   Linux (Only, Not)   iOS (Only, Not)  
Components   Crossplatform Mac & Win   Server   Client   Old   Deprecated   Guides   Examples   Videos
New in version: 10.1   10.2   10.3   10.4   10.5   11.0   11.1   11.2   11.3   11.4    Statistic    FMM    Blog  

GMImage.Threshold

Threshold image channels (below threshold becomes black, above threshold becomes white).

Component Version macOS Windows Linux Server iOS SDK
GraphicsMagick 2.0 ✅ Yes ✅ Yes ✅ Yes ✅ Yes ✅ Yes
MBS( "GMImage.Threshold"; ImageRef { ; threshold } )   More

Parameters

Parameter Description Example Flags
ImageRef The image reference number. 1
threshold The range of the threshold parameter is 0 to MaxRGB (65535). 127*256 Optional

Result

Returns "OK" on success.

Description

Threshold image channels (below threshold becomes black, above threshold becomes white).

Examples

Applies a threshold on the image:

Let ( [
$Image = MBS("GMImage.NewFromContainer"; GraphicsMagick::image);
$Result = MBS("GMImage.Threshold";$Image; 127);
$Result = MBS("GMImage.WriteToJPEGContainer"; $Image);
$Error = MBS("GMImage.Release";$Image)
];
$Result)

Convert image to 1 bit TIFF:

# Load from container
$Image = MBS("GMImage.NewFromContainer"; GraphicsMagick::image);

# make black and white with threshold
$Result = MBS("GMImage.Threshold";$Image; 127);

# mark as monochrome image
$Result = MBS("GMImage.SetMonochrome";$Image; 1);

# set type to 1 for black/white
$Result = MBS("GMImage.SetType";$Image; 1);

# set to use TIFF for compression
$Result = MBS("GMImage.SetMagick";$Image; "TIFF");

# set to use CCITT 4 Fax compression
$Result = MBS("GMImage.SetCompressType";$Image; 4);

# and write to a file
$Result = MBS("GMImage.WriteToFile"; $Image; "/tmp/test.tif");

# cleanup
$Error = MBS("GMImage.Release";$Image)

Make a picture black and transparent:

Set Variable [$image; Value:MBS( "GMImage.NewFromContainer"; Test::BigImage)]
Set Variable [$r; Value:MBS( "GMImage.Threshold"; $image; 127)]
Set Variable [$imagecolor; Value:MBS( "GMImage.Transparent"; $image; "white")]
Set Field [Test::Result; MBS( "GMImage.WriteToPNGContainer"; $image;)]
Set Variable [$Error; Value:MBS("GMImage.Release";$image)]

See also

Example Databases

Created 18th August 2014, last changed 11st November 2019


GMImage.Texture - GMImage.TotalColors

Feedback: Report problem or ask question.