The images and point clouds that you create with GeoExpress are compressed by default. To specify how much you want to compress each raster image, you can specify a compression ratio, specify a target file size, use lossless compression, set per-band compression ratios, or use quantization. For LiDAR point clouds, you can specify a compression ratio or select lossless compression.
Use lossless compression for an image or point cloud to compress the data as much as possible without changing the image or point cloud. To use lossless compression, click the Properties tab and select the Lossless radio button.
Specify a compression ratio for an image or point cloud to specify how much smaller you want the output to be than the input. For example, if you have an uncompressed 100 megabyte image and you specify a compression ratio of 20:1, the file size of the output image is 5 megabytes. To set a compression ratio for a selected image, click the Properties tab and select the radio button next to the blank compression ratio field. Then, enter the compression ratio that you want to use.
When you compress floating point images, GeoExpress uses the quantization compression method.
For more information on compression, see Compression. For more information on setting default compression preferences, see Preferences.