Topics   All   Mac OS X (Only)   Windows (Only)   Linux (Only, Not)   iOS (Only, Not)  
Components   Crossplatform Mac & Win   Server   Client   Old   Guides   Examples
New in version: 8.0   8.1   8.2   8.3   8.4   8.5   9.0   9.1   9.2   9.3    Statistic  


Random threshold image.

Component Version macOS Windows Server FileMaker Cloud FileMaker iOS SDK
GraphicsMagick 2.0 Yes Yes Yes Yes Yes
MBS( "GMImage.RandomThresholdChannel"; ImageRef; thresholds; ChannelType )   More


Parameter Description Example value
ImageRef The image reference number. 1
thresholds The rectangle. Geometry is specified as a width and height "100x200". With an optional offset "100x200+10+20". For percent values, add a percent on the end, for % values add a %: "100x200%!" "100x200"
ChannelType ChannelType One of the following values: RedChannel = 1 (RGB Red channel), CyanChannel = 2 (CMYK Cyan channel), GreenChannel = 3 (RGB Green channel), MagentaChannel = 4 (CMYK Magenta channel), BlueChannel = 5 (RGB Blue channel), YellowChannel = 6 (CMYK Yellow channel), OpacityChannel = 7 (Opacity channel), BlackChannel = 8 (CMYK Black (K) channel), MatteChannel = 9 (Same as Opacity channel (deprecated)), AllChannels = 10 (Color channels), GrayChannel = 11 (Color channels represent an intensity.)


Returns "OK" on success.


Random threshold image.
Changes the value of individual pixels based on the intensity of each pixel compared to a random threshold. The result is a low-contrast, two color image. The thresholds_ argument is a geometry containing LOWxHIGH thresholds. If the string contains 2x2, 3x3, or 4x4, then an ordered dither of order 2, 3, or 4 will be performed instead. If a ChannelType argument is specified then only the specified channel is altered. This is a very fast alternative to 'quantize' based dithering.

Created 18th August 2014, last changed 18th August 2014

GMImage.RandomThreshold   -   GMImage.Read

Feedback: Report problem or ask question.

MBS FileMaker blog