[sane-devel] Canon PIXMA MX890

[Gernot Hassenpflug]

On Thu, Nov 29, 2012 at 2:43 AM, Henry Ptasinski <henry at logout.com> wrote:
> On 11/28/2012 09:38 AM, Henry Ptasinski wrote:
>>
>> Flatbed scans with resolutions up to 600 dpi all seem to be working
>> fine.  At 1200 and 2400 dpi, the images are mangled.  Columns appear to
>> be interleaved at both resolutions.  I assume the problem is due to a
>> missing check in pixma_mp150.c:post_process_image_data().  Any
>> suggestions for how to start fixing this issue?


Hello Henry,
Yes, that is the correct solution. We know by now that many newer
devices require this exception, but we will only add the exception
when someone reports it, as that is the only sure way to tell.
Thank you for bringing this to our attention. Nice to know that both
1200 and 2400 work without extra image data manipulation necessary
too.

Regards,
Gernot Hassenpflug

> With a little poking around, I found that this change fixes the 1200 and
> 2400 dpi scanning problem:
>
> --- a/backend/pixma_mp150.c
> +++ b/backend/pixma_mp150.c
> @@ -1081,6 +1081,7 @@ post_process_image_data (pixma_t * s, pixma_imagebuf_t
> * i
>            /* special image format for *most* devices at high dpi.
>             * MP220, MX360, MX370, MG5300 are exceptions */
>            if (s->cfg->pid != MP220_PID && s->cfg->pid != MX360_PID
> +              && s->cfg->pid != MX890_PID
>                && s->cfg->pid != MX370_PID && s->cfg->pid != MG5300_PID && n
>> 0
>                reorder_pixels (mp->linebuf, sptr, c, n, m, s->param->wx,
> line_si
>
>
> For people more familiar with the pixma code, does this seem like the right
> approach?
>
>
> Thanks,
> ---
> Henry Ptasinski
> henry at logout.com
>
>
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