Detector de filigrana

[stamps9407]

Hola, alguno a usado este detector de filigrana?

Morley Bright Inst-a-Tector - watermark detector - NEW

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... TQ:US:1123

Ventajas
se puede usar por un par de años
el sello no entra en contacto con ningún líquido

Desventajas
tamaño, hasta sellos de 35x45mm

Me gustaría saber si uds. lo han usado, y cual es la experiencia

Gracias

Sergio

[Rein]

Sergio,

I think the best way to detect watermarks is to do what Tony Rubiera and I are doing using a computer scanner. Not only the watermarks get visible, some other details will be seen as well:

10c Evita with symmetrical paper wire and an orthogonal watermark:



10c Evita with a-symmetrical paper wire [and thus the more or less horizontal lines AKA "rayado"] and a parallel watermark:

[stamps9407]

Hello Rein,

I am thinking on buying an scanner. Do I need an special scanner for analizyng watermarks with the computer? Are you both (Rubiera and you) using the same technique? because your pictures doesn't looks the same, Tony's pictures looks like the light is passing thru (if you understand what i mean), but the pictures you have shown are more opaque.
Have you had any problems with any kind of watermark?
If the technique you are using is explained in other post please let me know.

Thanks

Sergio

[rodrigo-javier]

¿y eso que hace que se distinga mejor que con la bencina?

[zakur]

Eso permite tener una imagen permanente de la filigrana, lo que te da tiempo a compararla con otras, con las imágenes del catálogo, medirla, etc.

That allows you to get a permanent image of the watermark; so you have time to measure it, compare it with other ones, with the catalog images, etc.

[Rein]

Hello Rein,

I am thinking on buying an scanner. Do I need an special scanner for analizyng watermarks with the computer? Are you both (Rubiera and you) using the same technique? because your pictures doesn't looks the same, Tony's pictures looks like the light is passing thru (if you understand what i mean), but the pictures you have shown are more opaque.
Have you had any problems with any kind of watermark?
If the technique you are using is explained in other post please let me know.

Thanks

Sergio

Sergio,

I am using a flat-bed scanner made by HP Scanjet G3010. The resolution I use is 2400dpi [although 1200dpi may do] and have the most contrast,darkness etc.



The scanner can do slides as well - that is what Tony calls back-scanning [from the back, goes through the paper] and so he gets a different result. My scans are more like what you can see with your own eyes having enough light to come from aside making "shadows" of the differences in "height" in the paper surface.

[daa1406]

en este link puse el scaner que uso yo y se consigue por mercado libre.

http://www.filateliaargentina.com.ar/fo ... nner#p7080


Daniel

P.D. : escanea diapo y negativos (los convierte a positivos y podes recuperar la foto).