Alters the interpretation type of rasters, including all bands, and converts cell values if necessary.

Jump to Configuration

Typical Uses

  • Changing raster interpretation type to meet format or processing requirements.

How does it work?

The RasterInterpretationCoercer receives raster features and converts all bands based on a chosen Destination Interpretation Type. Choices include:

  • RGB24
  • RGBA32
  • RGB48
  • RGBA64
  • Gray8
  • Gray16
  • Red8
  • Red16
  • Green8
  • Green16
  • Blue8
  • Blue16
  • Alpha8
  • Alpha16
  • UInt8
  • Int8
  • UInt16
  • Int16
  • UInt32
  • Int32
  • UInt64
  • Int64
  • Real32
  • Real64

Options are available to control the manner in which cell values are converted, handling color to color, numeric to color, color to numeric, numeric to numeric, and floating-point to integer conversions.

Band names, if they exist, are retained.

This transformer is unaffected by raster band and palette selection.

Multi-Band Rasters

When converting to an interpretation with multiple components, such as RGB and RGBA, the input raster will be expected to have exactly 1, 3, or 4 bands. If only one band is supplied, it will be cloned to create the correct number of bands for conversion to the chosen interpretation.

When converting to a single color or numeric interpretation, multiple input bands will be averaged into a single one.


If bands selected for conversion contain palettes, the destination interpretation must be an unsigned integer - UInt8, UInt16 or UInt32 to accommodate the palette keys.


Usage Notes

Choosing a Raster Transformer

FME has an extensive selection of transformers for working with raster data. They can be generally categorized as working with whole rasters, bands, cells or palettes, and those designed for workflow control or combining raster with vector data.

For information on raster geometry and properties, see Rasters (IFMERaster).


Input Ports

Output Ports


Editing Transformer Parameters

Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.

Defining Values

There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.

Dialog Options - Tables

Transformers with table-style parameters have additional tools for populating and manipulating values.


Processing Behavior


Feature Holding


Dependencies None
History This transformer replaces the RasterDataTypeCoercer and RasterColorModelCoercer transformers.

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Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.