<br><br><div class="gmail_quote">On Tue, Sep 15, 2009 at 1:28 PM, Michael Mol <span dir="ltr"><<a href="mailto:mikemol@gmail.com">mikemol@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">On Tue, Sep 15, 2009 at 1:13 PM, Bob Kline <<a href="mailto:bob.kline@gmail.com">bob.kline@gmail.com</a>> wrote:<br>
> On Tue, Sep 15, 2009 at 12:56 PM, Michael Mol <<a href="mailto:mikemol@gmail.com">mikemol@gmail.com</a>> wrote:<br>
>> On Mon, Sep 14, 2009 at 5:18 PM, Bob Kline <<a href="mailto:bob.kline@gmail.com">bob.kline@gmail.com</a>> wrote:<br>
>> > In the LINUX column, I discovered that<br>
>> > LINUX does not support Canon scanners.<br>
>> > I tried XSane and Scanlite. XSane will<br>
>> > produce a scan, but the colors are way<br>
>> > off, and I couldn't find a way to correct<br>
>> > them.<br>
>><br>
>> Have you tried building a color profile for the scanner? The lprof<br>
>> package looks like it might help.<br>
>><br>
> That's the kind of thing Canon and<br>
> others provide you when they supply<br>
> you with a CD for your windoz system.<br>
<br>
</div>*Sometimes* they do, and it depends on the device. However, each<br>
device will have slight difference resulting from the manufacture<br>
process, and it's not unknown for professionals who want the greatest<br>
precision and accuracy to build their own color profiles.<br>
<br>
In the case of monitors, the color profile is often generated<br>
afterward by software you install on your system.<br>
<br>
[snip]<br>
<div class="im"><br>
> See: <a href="http://en.wikipedia.org/wiki/Linux_color_management" target="_blank">http://en.wikipedia.org/wiki/Linux_color_management</a><br>
><br>
> and in particular:<br>
><br>
> Software for input and output profiling<br>
<br>
</div>See "apt-cache search ICC|less".<br>
<div class="im"><br>
<br>
> Looks to me like this is a big enough job<br>
> that it should only be done once, preferably<br>
> by the people doing the reverse engineering.<br>
<br>
</div>No, because there are manufacturing level differences that are<br>
important if you want precision.<br></blockquote><div><br>I suspect for most people those<br>differences are quite minimal. i.e.,<br>the sensors are solid state, and<br>probably pretty uniform to start with.<br><br>That said, the little package for windoz<br>
that comes with the unit does have a <br>calibration step when you turn on the printer. <br>It uses the white surface of the cover, which might<br>be where the uniformity you refer to<br>really comes in. ( For this reason one<br>
doesn't want any material in the scanner<br>when they start..... )<br><br>I just looked at my HP unit, and there<br>too, the white cover could be used. If<br>one knew how that calibration program<br>works, it would be nice to have under<br>
Linux. That way one only has to assume<br>they know the white cover material is <br>in place. <br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im"><br>
> It take equipment the typical putterer is not<br>
> likely to even have access to, much less own.<br>
<br>
</div>Reverse-engineering USB traffic between Windows and a USB device?<br>
Windows VM guest on a Linux host, using the tools that exist on Linux<br>
for sniffing USB traffic. No special hardware required.<br>
<div><div></div><div class="h5"><br></div></div></blockquote><div>No, the photometric equipment and<br>charts referred to. Less of on issue on<br>output, you nevertheless need to have<br>some concept of when you've arrived.<br>
Maybe color charts. Things like color<br>accuracy span the gamut from your<br>device to room light to whether you're<br>color blind in any way. Real precision<br>is an art. Go to a paint store for a color<br>today and they just might have you <br>
stand in a booth where you first adjust<br>the lighting, to give you some idea what<br>will happen after you buy it and splatter<br>it on your walls.<br><br>Anyway, this is all good stuff to know<br>about. Even though my Canon FB630Ui<br>
is ten years old now, and likely long out<br>of production, I will at least interact with<br>the people doing the real work and see if<br>they're interested in tuning up support<br>for it.<br><br> -- Bob<br> <br></div>
</div>