Re: Dial face colouration

2017-02-26 Thread Kevin Karney
Dear Steve I do not know how you are planning to cut and fabricate your plastic sheeting. But if you have not looked, there are many many bi-colour double layered UV resistant acrylics used by the sign-writing industry. See, for example,

Re: Dial face colouration

2017-02-26 Thread John Lynes
There is no single optimum reflectance for a flat dial face. Obviously under dim sunlight the optimum reflectance would be 100 per cent, i.e.perfect white. Under intense sunlight, contrast sensitivity would be optimised for a lower value of reflectance. Thousands of papers have been written on

Re: Dial face colouration

2017-02-26 Thread Patrick Vyvyan
When taking light meter readings for photography, it is common to use an 18% grey card in place of the object which will actually be photographed. This is generally considered to give a reading which will accurately balance light and dark. See: https://en.wikipedia.org/wiki/Gray_card Might be

Re: Dial face colouration

2017-02-26 Thread Steve Lelievre
Hi Kevin, Yes, I plan to use laser engraving and cutting. There is a local community maker workshop that charges $2 per minute of cutting time for using their machine with exactly the setup you describe - I choose line colours in my PDF depending on whether I will want the areas or line

Re: Dial face colouration

2017-02-26 Thread Thibaud Taudin Chabot
My experience is use a mat finish sand color. It also matches with nearly every colorscheme. At 03:25 26-2-2017, Michael Ossipoff wrote: It seems to me that Steve's question has been mostly disregarded rather than answered. Not having experience with translucent dial-faces, I didn't know

Re: Dial face colouration

2017-02-26 Thread koolish
18% gray is used because that was thought to be the average reflectance of photographic subjects. - Original Message - From: "Patrick Vyvyan" To: "John Lynes" Cc: "sundial list" Sent: Sun, 26 Feb 2017 13:01:10 -0300