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Topic: Judging A Roast: An Alternative (4 msgs / 93 lines)
1) From: Eric B. Stauffer
So I go to lunch at my favorite mex spot just a five minute walk from
where I work, the entire "Judging" discussion fresh in my mind. I start to
think about how we could eliminate the variability of eyeballing a roast.
It just so happened that my friend had done some image analysis for a bone
density study. In short, he took and cross sectional bone image looked at
each picture, eliminated the non-essential data, and calculated density
from the colors/hue/saturation of each pixel.
Why, I thought, couldn't we do the same with coffee. The trick would be in
developing a standard. It would be similiar to the Pantone handy color
checker but you would need a comparative standard to account for source
image variabiliyt.
My idea goes something like this:
1. Take a digital photo or scan in a measure of ground coffee along with a
standard. A standard such as:http://shop.store.yahoo.com/cinemasupplies/lasgreycar4x.html2. Save the file as a GIF image.
3. Upload GIF image to web site.
Now the difficult would be how to tell the image analysis program what is
standard and what is coffee. Once that is done, most likely by
registration marks in the image, a program would correct for exposure and
color for the standard, then create a histgram of the colors/intensities
comprising the coffee sample and deliver to you a color measure -- most
likely in RGB values.
Anyone up for giving this a try?
Eric
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2) From: John Abbott
Eric,
You need to stay out of the hot sauce!! (and the Cervasas) Gif formats
are limited and if we are going to upload 2.4 meg photos its going to be
a BIG site. And then downloading it and looking at it on the screen or
printing it on our cheap printers is going to leave A LOT to be desired.
We would spend more time of print coordinating than we do roasting - and
that's always bad.
John
On Wed, 2002-09-18 at 13:14, Eric B. Stauffer wrote:
<Snip>
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3) From: Eric B. Stauffer
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Although GIF images are limited to 256 colors (plenty for this excercise)
my thought would be that you would NEVER actually print out the image, but
rather compare your numerical results with others, and perhaps analyze
some standard (Sherwin Williams??) colors for comparison.
As for the site, I've got 72GB of space available so that wouldn't be the
problem! Lastly, I would never store the image, but rather the data
representing it.
I would never think of doing something that would take away time from
roasting!!
Eric
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4) From: John Abbott
AHA! Light comes on!  That's a possibility worth pursuing. I just didn't
get it the first time, sorry.  I was busy with two experiences - blew a
pipe under the kitchen sink (slosh slosh slosh - fixed) and I just
pulled an INCREDIBLE Americano from Panama Boquete - Finca La Berlina I
think I may have found another "keep in stock" bean.  Gotta thank
Charlie and the group for pushing me into it.
John
On Wed, 2002-09-18 at 13:30, Eric B. Stauffer wrote:
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