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ERDAS ER Viewer is a free, easy-to-use image viewer that enables you to interactively roam and zoom large JPEG 2000 and ECW files. It can also read most other common file types. ERDAS ER Viewer also lets you embed large geospatial images in your Microsoft Word documents.

ERDAS ER Viewer is a handy image viewer that is designed to open large image files and to zoom in to a certain area. It includes an image adjustment function that allows you to smooth out the pixelated images. The application supports all popular image formats, such as JPG, PNG and BMP, but it also has the ability of opening other file formats that are more common in specialized domains.

ERDAS ER Viewer prints to common large-format printers, and supports the following file formats:

JPEG 2000
ECW
Universal Data Format (UDF) images
ER Mapper images
TIFF and GeoTIFF images
SPOT View images
Esri BIL (ARC/INFO and ArcView) images
Smart Data ER Mapper algorithms
National Imagery Transmission Format (NITF)
ERDAS IMAGINE (IMG)
ArcInfo ASCII Grid (ASC)
Portable Network Graphics (PNG)
USGS SDTS (DEM)