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This parameter helps control the colour mode of the grayscale image. This parameter is very important when trying to read inverted barcodes. Barcodes typically are dark on a light background, but sometimes they might be inverted, resulting in a light barcode on a dark background. By default, the library is configured to detect the former. So if you are working with inverted barcodes, GrayscaleTransformationModes is the parameter to deal with them.

It consists of one or more modes, each mode represents a way to transform the grayscale image.

Candidate Mode List



Keeps the original grayscale. This mode has the following arguments for further customization.


Transforms the image to inverted grayscale. This mode is the one to use for inverted barcodes. It also has the following arguments for further customization.

Setting Methods

As PublicRuntimeSettings Member

GrayscaleTransformationModes can be set dynamically during runtime as a member of FurtherModes, which is a member of PublicRuntimeSettings struct, it is an array with 8 GrayscaleTransformationMode Enumeration items.

Code Snippet in C++

//...other codes
PublicRuntimeSettings* pSettings = new PublicRuntimeSettings;
int errorCode = reader->GetRuntimeSettings(pSettings);
pSettings->grayscaleTransformationModes[0] = GTM_ORIGINAL;
delete pSettings;
//...other codes

GetModeArgument and SetModeArgument need to be called for getting and setting Arguments.

See Also

As JSON Parameter

GrayscaleTransformationModes as a JSON parameter is a JSON Object array. Each JSON object is defined as below.

Key Name Key Value Description
Mode Any one in Candidate Mode List as string (Required) Specifies a mode for grayscale transformation.
LibraryFileName A string from value range of LibraryFileName (Optional) Sets the Argument LibraryFileName.
LibraryParameters A string from value range of LibraryParameters (Optional) Sets the Argument LibraryParameters.

JSON Parameter Example

    "GrayscaleTransformationModes": [
            "Mode": "GTM_ORIGINAL"
            "Mode": "GTM_INVERTED" 

Candidate Argument List


Sets the file name of the library to load dynamically.

Value Type Value Range Default Value Valid For
string A string value representing file name. ”” All modes

The library must be in the same place with Dynamsoft Barcode Reader Library.


Sets the parameters passed to the library to load dynamically.

Value Type Value Range Default Value Valid For
string A string value representing parameters. ”” All modes

This page is compatible for:

Version 7.5.0

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