[sane-devel] terrible (systematically corrupted) jpg at 1200dpi

ken gebser at mousecar.com
Wed Jan 28 18:44:31 UTC 2015

What I wrote already in the prior email makes it clear this is a 1200dpi 

"4 pixels per dot" would correspond to 3 colors + a B/W bit for each 
dot-- what would be required for color scanning at 1200dpi.  "Pixel" is 
a rather slippery term.  Perhaps the tech should have said "sensel". 
But this was tier-one tech support after all, not a developer I was 
talking with.  And she had to look up that much.

On 01/28/2015 10:33 AM, m. allan noah wrote:
> "4 pixels per dot" is a meaningless statement. A dot is a pixel. You
> would have to ask the hplip guys if they can get 1200 dpi out of this
> scanner.
> allan
> On Wed, Jan 28, 2015 at 9:39 AM, ken <gebser at mousecar.com> wrote:
>> On 01/28/2015 07:23 AM, m. allan noah wrote:
>>> at least in lineart mode, the scanner maximum is 300dpi. Try scanimage
>>> --mode=color --help
>>> allan
>> According to specifications published by HP, this scanner's hardware and
>> optical resolution is 1200x1200 dpi.  I just called HP tech support to
>> confirm this and was told this is correct and that, further, there are "4
>> pixels per dot", meaning that the scanner handles both color and B/W at that
>> resolution.  So I don't know why scanimage would report that 300dpi is the
>> maximum resolution.

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