Hi, This bug report:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=246038 shows a problem with setting the contrast option when using the SANE hpaio driver from HPLIP 1.7.4a with an HP Color LaserJet 2840. The three sample images show scans with the contrast set to 0, 50, and 100: however, they look very similar indeed, and a histogram analysis shows mostly no difference between them. I have seen that some devices are not capable of setting the contrast, but this device does not seem to be one of those. Is the contrast control really so ineffective on this device, or is hpaio not passing the contrast value through to it? Tim. */
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