For example, large differences in file size between the uncompresssed TIFF and the lossless JPEG 2000 can be indicative of “oversampling” of the digital image. This can occur when the ability of the scanner to resolve actual detail in the image falls below the ability to sample the available detail with scanner driver software. While the actual content of the image strongly determines compression savings with the JPEG 2000 wavelet method, one should start getting a little suspicious when compression savings are greater than 1.5:1

Note: Sampled image resolution is not identical to available image resolution. The latter is bound by the laws of Physics and hardware design, while the former is a characteristic of the driver software.

Oversampling conditions can be measured using image quality target analyses like those based on the ISO 16067 standard, and have notable consequences for digitizers (and their clients, if the task is outsourced):

* The image is not as resolute as it is supposed to be.
* The file sizes for uncompressed delivered and/or archived formats (like TIFF) is much larger than it needs to be to support the actual quality captured.

This phenomenon is not necessarily detectable if target-based methods have not been used to establish the capabilities of in-house or vendor operated scanning systems.