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How to determine leakage in ASET image?

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haagen_dazs

Brilliant_Rock
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Hi all
I was wondering how to determine leakage in ASET images.
I know more white (assuming back ground is white light) in a IS image indicated possible leakage.

How about for ASET ?
Are we suppose to see more black ??
 
Date: 10/9/2009 12:21:09 AM
Author:haagen_dazs
Hi all
I was wondering how to determine leakage in ASET images.
I know more white (assuming back ground is white light) in a IS image indicated possible leakage.

How about for ASET ?
Are we suppose to see more black ??
ASET scopes come in two varieties with a black or white background depending upon whether they are backlit or not.

Backlit White ASET:

White shows how much leakage is present (bad, especially when the leakage is adjacent to blue; when you will see a large dead dark zone in normal lighting)

In black background ASET:

Black shows how much leakage is present (bad, especially when the leakage is adjacent to blue; when you will see a large dead dark zone in normal lighting)

I find for black background ASET I''d rather look at the Idealscope to determine the leakage as black can blend with the other colors and it makes the contrast difficult to fully differentiate.
 
I''d ditto CCL''s sentiments and is particularly why we personally use a backlit ASET. Another feature unique to our photography is that our blues are not mixed with blacks and represent the true 75-90 degree angular spectrum indicated by that color. The black background imo is not good for trying to assess leakage.
 
Date: 10/9/2009 12:36:30 AM
Author: Rhino
I'd ditto CCL's sentiments and is particularly why we personally use a backlit ASET. Another feature unique to our photography is that our blues are not mixed with blacks and represent the true 75-90 degree angular spectrum indicated by that color. The black background imo is not good for trying to assess leakage.
I would like to add one more thing. The tabletop ASET with a sealed chamber (I am sure from GOG's images that he has one like it) keep out stray background light and focus the backlighting and seem to have a better lense attached to them as well. Images taken with this more expensive machine have more vibrant colors, better contrast, sharper images and make it easier to line up the girdle with the lense. You can tell the difference between the table top and handheld ASET images by the color of the red, the hand held ASETs have a more crimson darker red and are not as crisply focussed whereas the tabletop the darkest red is more of a cherry color and the focus can be very crisp.
 
Date: 10/9/2009 12:31:15 AM
Author: ChunkyCushionLover
In black background ASET:


Black shows how much leakage is present (bad, especially when the leakage is adjacent to blue; when you will see a large dead dark zone in normal lighting)

Thanks chunky and rhino for the fast replies

i just posted in another thread some "black background ASET" images i think
if you can comment on the leakage that would be great
36.gif
 
Date: 10/9/2009 12:21:09 AM
Author:haagen_dazs
Hi all
I was wondering how to determine leakage in ASET images.
I know more white (assuming back ground is white light) in a IS image indicated possible leakage.

How about for ASET ?
Are we suppose to see more black ??
This link will tell you what you need to know.
 
I personally like the black background ASET images for the purely pragmatic reason that it can be replicated when the stone is mounted. I find one of the primary benefits of ASET as t tool is that it can be used on mounted stones with very similar results to what is seen unmounted.

Neil Beaty
GG(GIA) ICGA(AGS) NAJA
Professional Appraisals in Denver
 
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