Re: White references
Re: White references
- Subject: Re: White references
- From: Ernst Dinkla <email@hidden>
- Date: Sat, 19 Sep 2015 13:13:04 +0200
Five years ago the use of Teflon tape was discussed on the ArgyllCMS list:
http://www.freelists.org/post/argyllcms/2-white-reflectance-standard
There is a spectral plot of a Teflon tape stack in SpectrumViz:
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
Measured on a stack of the tape 12mm wide and 9 mm thick. That is enough
thickness for reflection. 19mm wide tape exists too, should improve
sideways opacity. Cut the roll so the winding comes off as one piece, and
fold that stack once or twice. Store in an old camera filter box or alike
that presses the stack flat. From time to time peel off a tape layer to
keep the top clean, it will not degrade etc by light etc but attracts dust.
Polystyrene will degrade in time and attract dust.
I use it together with a Color Checker passport. True, bending it so there
is some difference in lighting on the surface makes it easier to set white
balance, though in ACR you can still white balance and pull exposure
afterwards as the Teflon sample will always give the highest reflection of
all the objects captured. Overexposure in the take should be avoided.
Met vriendelijke groet, Ernst Dinkla
Dinkla Grafische Techniek
Quad, piëzografie, giclée
www.pigment-print.com
>
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden