[argyllcms] Re: 2$ white reflectance standard?

  • From: Bob Coss <bobcoss@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 13 Mar 2010 13:39:58 -0500

Would someone mind sharing the exact commands they are using to do the spot
read so I can make sure I'm doing it the same as everyone else.

I've got a couple of different brands of tape I'll measure.

Thanks

On Sat, Mar 13, 2010 at 5:12 AM, Martin Weberg <martin.weberg@xxxxxxxxx>wrote:

> I dug out some old thread seal tape I knew was laying around. It's at
> least a decade old. Only about 4mm thick layer of PTFE left and a blue
> core/roll. Measured it using my Spectrolino, spotread -Fn.
>
> Three readings:
> Just touching the PTFE
> Pushing the spectro onto the PTFE
> Measurement of the reference tile
>
> Lab values:
> 99.77639        -0.368822       -0.919332
> 99.614116       -0.738062       -1.796401
> 95.862586       -0.691355       1.124242
>
> Plots are attached.
>
> Seems like the blue core "shines through" when pushing onto the PTFE.
> I don't now the thickness of PTFE on a fresh roll but I guess it's at
> least the double (~8-10mm). That would help I think together with a
> white core. I'll grab a fresh white roll when I get the opportunity.
>
> Martin Weberg
>



-- 
Hay que aprender algo nuevo todos los días

Other related posts: