Re: Betterlight Camera Calibration
Re: Betterlight Camera Calibration
- Subject: Re: Betterlight Camera Calibration
- From: "Stanley Smith" <email@hidden>
- Date: Wed, 01 Oct 2008 10:19:10 -0700
Interesting. However, I have a couple of comments that may temper
enthusiasm for this product. First, conservators at the Getty would
never allow direct measurement of a painting with a device that touches
the surface of piece. Unless the spectral measurements could be taken
at a distance (does such a device exist?), then this system will
probably be relegated to the Giclee world, and not to major art
museums.
Second, it seems that the proprietary nature of this HP workflow sees
the end point as simply a print — only printed on an HP printer (in fact
a connected HP printer is REQUIRED for operation-- as Edmund observes--
the biggest dongle on earth). We never store archival master files
tagged with a camera profile-- they are too subject to changes -- camera
firmware and general improvement in capture technology. I need to be
able to open a master file in 10 years (even 100 years), and know what I
am looking at. Chances are that HP printer that was used in this
workflow would long be obsolete, so where does that leave you?
Thirdly, this is not really spectral capture. True, there is a lots of
buzz in the painting conservation world regarding spectral capture, but
it is seen as an analytical tool-- involving cooled chips, narrow band
filters, and as many as 20 separate exposures. Such a gamut is huge--
well into the IR and UV. All very interesting stuff (see: Lumiere's
capture of the Mona Lisa), but the value is in the quantitative data and
analysis-- not simply the ability to make a better first print. This
system uses Betterlight's (wonderful) tri-linear array-- this is RGB
capture, not spectral capture.
Lastly, I am very interested in this tool as a way to create a better
camera profile that can then be converted to a big RGB working space.
But if my ability to do this somehow prohibits me from using the data if
I have an Epson in my workflow, then I am much less interested.
Stanley Smith
Manager, Imaging Services
J. Paul Getty Museum
1200 Getty Center Drive, Suite 1000
Los Angeles, CA 90049-1687
(310) 440-7286
>>> "edmund ronald" <email@hidden> 9/30/2008 2:55 PM >>>
Hi list -
I saw Robin's solution. Results are impressive, as is the size of the
dongle (an HP Z printer).
Edmund
On Tue, Sep 30, 2008 at 5:44 PM, Robin Myers <email@hidden>
wrote:
> Hello Mr. Fleisher et al,
>
> Here is a brief description of the new camera calibration.
>
> ColorSage is the software, a collaboration between Better Light
> (betterlight.com) and HP. It uses the HP Artist library from HP to
perform
> spectral matching of an artwork. The software takes 6 inputs; an
image of
> the artwork, an image of a white card, spectral measurements of the
artworks
> pigments (minimum of 50), spectral measurements of the white card
(miniumum
> 10), the camera's spectral response, and ths spectrum of the capture
> lighting. It then computes a scene referred ICC profile from the
spectral
> data and attaches this profile to the artwork image. The image is
then ready
> to print on an HP Z3200.
>
> The results are very impressive. A very good image the first print,
without
> proof prints or color adjustment in Photoshop. The ICC profile is
unique for
> each artwork, optimized for it's pigment set.
>
> Right now it requires a Better Light camera and an HP Z3200 printer.
It does
> not work with other cameras or printers. HP developed the library so
it will
> not be adapted to Epson or Canon printers. It could, in the future
be
> adopted for other cameras.
>
> More information can be found on the Better Light website.
>
> Regards,
>
> Robin Myers
>
>
> On Sep 24, 2008, at 09:09 , Fleisher, Ken wrote:
>
>> Has anyone seen the mysterious camera calibration solution at the
>> Betterlight booth at Photokina? I figure Robin Myers won't have a
chance
>> to
>> post anything about it for a while and I'm too curious to wait! :-)
I'm
>> just
>> wondering what it's all about...
>>
>> --
>> Ken Fleisher
>>
>> Photographer
>> Imaging & Visual Services
>> National Gallery of Art
>> Washington, D.C.
>>
>> Phone: (202) 712-7471
>> email@hidden
>
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