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Original User: peterbecker
The reason for the increase in size is that the format of the compressed TIF format for overviews was changed in between 9.3 and 10.0
In 9.3 TIF with YCBCR JPEG compression is used, while in 10.0 TIF with RGB JPEG compression is used. For Natural Color imagery the YCBCR compression does provide better compression and this accounts for the difference in files size. If it is necessary to reduce the size of the overviews one option is to use the Com
see Imagery tool in http://resources.arcgis.com/gallery/file/image-management. With this you can quickly convert the TIF files in the Overview directory to the YCBRB version of TIF and then replace the existing files with the revised files.
That is great information! I will certainly try the compression tool.