PNG is an image format that supports a wide range of classified and continuous color models.
The PNG format can only support up to 256 palette colors as a classified image, but can support both 1- and 2-byte RGB, RGBA, and grayscale continuous images.
The format was introduced in 1995 as a replacement format for GIF, specifically implemented so that it does not require a patent to use compression.
PNG Product and System Requirements
|
Format |
FME Platform |
Operating System |
||||
|---|---|---|---|---|---|---|
|
Reader/Writer |
FME Form |
FME Flow |
FME Flow Hosted |
Windows 64-bit |
Linux |
Mac |
|
Reader |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
|
Writer |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Reader Overview
FME considers a single PNG file to be a dataset. The PNG file contains pixel data, and each pixel in the file is a point in a single FME raster feature.
Writer Overview
FME considers a dataset to be a folder name.
FME Raster Features
FME raster features represent raster data and use several concepts that are unlike those used in the handling of vector data.
For comprehensive information about how FME processes raster data, see Rasters.
PNG files can only be written with square pixel dimensions.
PNG supports rasters with the following band structures:
- Red, Green, Blue
- Red, Green, Blue, Alpha
- Gray
- Gray, Alpha
- UInt8 with an RGBA32 palette