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[#315187] genesys: CanoScan Lide 100, “pixelated” grayscale scans

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Date:
2015-09-29 23:04
Priority:
3
State:
Open
Submitted by:
Bogdan Szczurek (thebodzio-guest)
Assigned to:
Nobody (None)
Category:
backends (drivers)
Group:
None
Resolution:
None
Summary:
genesys: CanoScan Lide 100, “pixelated” grayscale scans

Detailed description
Scans from CanoScan Lide 100 in grayscale mode appear “pixelated” regardless of resolution or bit depth. It's enough to set mode to full color to get the properly looking scans. Attached images illustrate the problem with the help of ad hoc sample pattern.

It doesn't seem to be any defect of my particular piece of hardware, since Canon's official Windows driver provides good grayscale scans.

Followups: Sort comments antichronologically

Message
Date: 2017-04-04 12:29
Sender: Olaf Meeuwissen

The person assigned to this tracker item is no longer a member of the project.

Attached Files:

Attachments:
Size Name Date By Download
486 KiBsample-200ppi-8bit-grayscale.tif2015-09-29 23:04thebodzio-guestsample-200ppi-8bit-grayscale.tif
1.42 MiBsample-200ppi-8bit-rgb.tif2015-09-29 23:04thebodzio-guestsample-200ppi-8bit-rgb.tif

Changes:

Field Old Value Date By
assigned_tostefdev-guest2017-04-04 12:29olaf-guest
assigned_tonone2015-11-28 13:33kitno-guest
File Added6901: sample-200ppi-8bit-rgb.tif2015-09-29 23:04thebodzio-guest
File Added6900: sample-200ppi-8bit-grayscale.tif2015-09-29 23:04thebodzio-guest
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