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Module: FoundationLite

Draws strings (text) on an image with a single color.

Name Type Range Description
Input value
inImage Image Input image
Input value
inStrings String?Array? Strings to be drawn.
Input value
inLocations Location?Array? Center position of strings
Input value
inLocationAlignment CoordinateSystem2D*
Input value
inLocationAnchor Anchor2D
Input value
inColor Pixel
Input value
inDrawingStyle DrawingStyle
Input value
inSize Real 10.0 - Height of a character in pixels
Input value
inOrientationAngle Real Orientation of text in degrees
Input value
inForceRgb Bool Filter will convert monochromatic image to RGB if needed
Input value
inBackgroundColor Pixel* Color of pixels drawn on image in text row
Output value
outImage Image Output image


The operation draws a strings on the inImage aligning the inLocationAnchor location of the text at the inLocations of the inImage. The height of the font is fixed and equals 16 pixels.


  • Connect an image source to the inImage input. Drawing will be done on this image.
  • If you want to draw on an empty background, use EmptyImage filter before.
  • Define inStrings. This will be the primitives to be drawn.
  • For each of the strings also define its location by setting the inLocations input.
  • If the locations provided on the inLocations input are in a local coordinate system, also set the inLocationAlignment input.
  • Set inLocationAnchor do define how each of the strings should be aligned in relation to its location.
  • Define the font size by setting the inSize input. Recommended values are: 16, 32, 48, 64.
  • Define inColor. Please note, that on an N-channel image only first N components of the color will be used.
  • Set inForceRgb to True, if you want to get a 3-channel output regardless of what is on the input.
  • Set inDrawingStyle to control quality, opacity, thickness, filling, point shapes and sizes.


Description of usage of this filter can be found in examples and tutorial: Capsules, Coins, Measure Objects , Read the Barcode, Read the QR Code.

Example usage of the DrawStrings_SingleColor on an empty image.


This filter can throw an exception to report error. Read how to deal with errors in Error Handling.

List of possible exceptions:

Error type Description
DomainError String and location arrays do not match in DrawStrings_SingleColor.

Complexity Level

This filter is available on Basic Complexity Level.

Filter Group

This filter is member of DrawStrings filter group.

See Also