Re: Materials for Flat-Fielding
Re: Materials for Flat-Fielding
- Subject: Re: Materials for Flat-Fielding
- From: Roger Breton <email@hidden>
- Date: Sat, 09 Jun 2007 10:58:48 -0400
> I am new to this so please excuse any stupid mistakes! I design instruments
> for colour measurement but never get to use them in all industries.
>
> I presume that a non glossy ink jet paper is used; the goniometric
> properties of glossy paper would create undesirable effects.
>
> How do you mount the paper to the Gatorfoam board? The ink jet paper is very
> translucent and hence its¹ reflectivity is dependent upon its¹ backing; air
> gaps between the paper and the Gator will affect radiance! A gradual change
> in colour¹ can not be seen by the eye (it can be measured though) but an
> abrupt change is exaggerated (the brain is looking for detail and so
> exaggerates changes.)
>
> One last question; if you have the largest flat-field standardising sample
> that you require then why do you require smaller ones? (This is definitely
> where my ignorance comes into play!)
>
> One comment. Regular changes in radiance due to the surface irregularities
> of a reflector are pure math functions and they can be corrected by a
> Fourier filter. I am not going to volunteer!
>
> Meari.
Dear Meari,
Do make a point of regularely posting to this List. I, for one, enjoy
reading your posts.
Roger Breton
Just a regular guy
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