only 300 dpi available scanning HP OJP 7740

Asked by Thomas Hunter

When scanning using HPLIP and xsane, 300 dpi is the highest resolution offered. Spec says that 1200 is available on the Officejet Pro 7740. Touchscreen allows 600 dpi. Usually 300 dpi is plenty, but to scan old photos and enlarge them higher resolution would be desirable. I don't understand why there should be what appears to be an arbitrary limit of 300 dpi..

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Thomas Hunter
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Thomas Hunter (tshunter001) said :

Suddenly, I have 1200 dpi scanning. I don't think that I did anything more than just doing another try. I do get a message that says: "Backend sends more image data than it defined in parameters", but I've had that before with other scanners.