Hi Guillaume, If you want to dig into the source code, you can look here:
file: pixma_mp810.c function: post_process_image_data() It's possible that post processing image data is broken. Please check these git commits: b4bb0062c5cbb77c895b439b5f47e70b506305b1 (2013-01-11 16:37:00) and 1da5bcc2aa16a6382e5bd78a47cb3ec222a9aafc (2012-01-15 03:48:19) Many thanks for your help. Cheers, Rolf Am 19.10.2014 um 15:20 schrieb Guillaume Courtois: > > Hi guys, > > I'm currently trying to make the TPU correctly work on my MP990 > scanner. It seems like there are shifting problems both in datas and > in the 3 colors (which seem to be 2 separate issues, but not sure). > > I'm currently testing on my debian SID with sane GIT version, but I > have tested packages from SID and made tests on a Mint 17 netbook > also. All seem to give the same results. > > It seems like datas are not shifted in 300 dpi but are more and more > shifted when you choose higher resolutions (600, 1200, 2400 dpi). > > I'm happy to provide pictures if you want to see what it gives, but > that gives vertical black stripes on the captured picture. > > Here is the output of xscanimage with some debug activated : > > Here is the 300 dpi correct scan : > > [pixma] pixma_scan(): start > [pixma] line_size=3378 image_size=9674592 channels=3 depth=16 > [pixma] Reader task id=140539733346048 (threaded) > [pixma] dpi=300x300 offset=(780,88) dimension=563x2864 > [pixma] gamma_table=0xd939e0 source=2 > [pixma] threshold=127 threshold_curve=0 > [pixma] ADF page count: 0 > [pixma] Setting non-blocking mode > [pixma] Current status: paper=0 cal=0 lamp=2 busy=0 > [pixma] Current status: paper=0 cal=0 lamp=2 busy=0 > [pixma] Current status: paper=0 cal=0 lamp=2 busy=0 > [pixma] Lamp status: 3 , timeout in: 19 > [pixma] pixma_read_image():completed > [pixma] Reader task terminated > [pixma] Reader task started > [pixma] Reader task id=140539733346048 (threaded) > > Here is the not-so-correct 1200 dpi scan : > > [pixma] pixma_scan(): start > [pixma] line_size=13938 image_size=67376292 channels=3 depth=16 > [pixma] dpi=1200x1200 offset=(282,446) dimension=2323x4834 > [pixma] gamma_table=0xd939e0 source=2 > [pixma] threshold=127 threshold_curve=0 > [pixma] ADF page count: 0 > [pixma] Setting non-blocking mode > [pixma] Current status: paper=0 cal=0 lamp=2 busy=0 > [pixma] Current status: paper=0 cal=0 lamp=2 busy=0 > [pixma] Current status: paper=0 cal=0 lamp=2 busy=0 > [pixma] Lamp status: 3 , timeout in: 19 > [pixma] WARNING:image size mismatches > [pixma] 67376292 expected (4834 lines) but 44044080 received (3160 > lines) > [pixma] pixma_read_image(): completed (underrun detected) > > As you can see, mismatch and underrun tells me I have to dig around that. > > Also, it seems like data coming from the preview window is > mis-interpreted : I have to pick a smaller and decaled window in order > to get the actual correct part of the scan I want to have (I don't > know if I'm pretty clear on that one ?). > > I'm still digging into the code to see if I can correct that but if > you guys could point me to the right direction, that would save me > lots of time. > > Thanks for your attention, keep up the nice work on sane ! > > Bye. > > -- sane-devel mailing list: [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to [email protected]
