Searching \ for '[OT] Color Filters' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/logic/dsps.htm?key=filter
Search entire site for: 'Color Filters'.

Exact match. Not showing close matches.
PICList Thread
'[OT] Color Filters'
1998\04\27@210634 by Sean Breheny

face picon face
Hello all,

Does anyone know where I could get color filters which simulate the
tristimulus response of the human eye? I imagine that minature versions of
these must be placed right on a mask in front of color CCD chips, but I am
looking for a macroscopic version of this. I would think that these must be
pretty common, but I have not been able to find them.

Thanks,

Sean


+--------------------------------+
| Sean Breheny                   |
| Amateur Radio Callsign: KA3YXM |
| Electrical Engineering Student |
+--------------------------------+
Fight injustice, please look at
http://homepages.enterprise.net/toolan/joanandrews/

Personal page: http://www.people.cornell.edu/pages/shb7
spam_OUTshb7TakeThisOuTspamcornell.edu
Phone(USA): (607) 253-0315

1998\04\28@035515 by Leo van Loon

flavicon
face
Edmund Scientific, http://www.edsci.com
They deliver all kinds of optics.

Leo van Loon

.....sbb.simpeltronKILLspamspam@spam@tip.nl


-----Oorspronkelijk bericht-----
Van: Sean Breheny <shb7spamKILLspamCORNELL.EDU>
Aan: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Datum: dinsdag 28 april 1998 4:13
Onderwerp: [OT] Color Filters


{Quote hidden}

1998\04\28@094509 by Reginald Neale

flavicon
face
Sean said:

>Does anyone know where I could get color filters which simulate the
>tristimulus response of the human eye? I imagine that minature versions of
>these must be placed right on a mask in front of color CCD chips, but I am
>looking for a macroscopic version of this. I would think that these must be
>pretty common, but I have not been able to find them.
>

"Response" involves not just filters but the spectral response curve of the
sensor itself. Hamamatsu has two new silicon photodiodes with a curve that
approximates the human eye. Ask for data sheet on types S6626 and S3868.
Under "features" the data sheet has an amusing error in transliteration. It
says "Visible compensation filter is useless." Probably meant to say
"Visible compensation filter is unnecessary."

On page 66 of the current Edmund Scientific Catalog N981B is the "Kodak
Photographic Filters Data Book." Wratten filters #25 (Red), #47 (Blue) and
#58 (Green) are listed on page 64 of the catalog. They are traditionally
used with a broadband sensor to simulate the Red, Green and Blue visual
responses.

Hamamatsu US phone  908-231-1218
Edmund Scientific   609-573-6250

Hope this is not "useless."  Good luck...

Reg Neale

1998\04\30@195420 by David Porter

flavicon
face
Hi Sean,
Yes, the filters would be a good idea.  However, it isn't the filter that
needs to conform to the tristimulus specifications, it is the system.  The
system includes (at least) the light source, filter, and detector.  These
things together must match the tristimulus specs.  That means that there is
no unique filter design that will do it with high accuracy.  If you are not
too picky about accuracy, take a look at the Kodak filter book and pick one
of the tri color packs they have for densitometry or color separation.  Any
of these will give you a useable system, but not exactly tristimulus
colorimetry.

Having worked in color standards laboratories for years, I can honestly
tell you that your (and my) life isn't long enough to worry about high
accuracy colorimetry.

Sincerely,
Dave Porter
@spam@dporterKILLspamspamvoicenet.com
----------
> From: Sean Breheny <KILLspamshb7KILLspamspamCORNELL.EDU>
> To: RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU
> Subject: [OT] Color Filters
> Date: Monday, April 27, 1998 7:56 PM
>
> Hello all,
>
> Does anyone know where I could get color filters which simulate the
> tristimulus response of the human eye? I imagine that minature versions
of
> these must be placed right on a mask in front of color CCD chips, but I
am
> looking for a macroscopic version of this. I would think that these must
be
{Quote hidden}

More... (looser matching)
- Last day of these posts
- In 1998 , 1999 only
- Today
- New search...