John Pollard|1294352449|2816082 said:RE: <<Black ASET help hide cut disadvantages>>Serg said:I completely agree with these Garry statements and support it.
Black ASET images has less important information about RBC( specially near AGSO) than IS images.
I see too much unfair attacks to this Clear Garry statement and Garry personally
ASET( specially white ASET) is helpful mainly for Fancy cuts.
Black ASET help hide cut disadvantages .
Nobody in this thread gives clear example when ASET is more helpful in selection "classical" RBC than IS.
White ASET and IS have similar level of information about "classical " RBC and choice between these tools is question of Taste and practice
IS has better "durability in selection" ( for RBC)
Black ASET is misleading sometimes
there are many AGS Bias on PS who don't even try to understand tools limitations
it is become more and more uncomfortable to Bring new ideas , opinions and knowledge to PS.
There is definitely more information with backlighting. It requires more effort to setup and photograph, for sure, but that should not stop those who wish to provide full information. Especially since it's the foundation of a cut grading system that it well-known and often sought-after; for rounds as well as fancies.
RE: <<Nobody in this thread gives clear example when ASET is more helpful in selection "classical" RBC than IS>>
Here are some examples for consideration. The implications become stronger as the numbers increase.
Corresponding ASET images.
what does show your example?
I see in "your" example:
1) Both of Them ( IS and ASET) clearly separate unpainted RBC from strongly Crown painting RBC
2) Neither of Them gives answer what diamond is better( more bright, more Fire,..)
3) ASET is complicated tool to "grade" painting ( IS has much more simple rule to select RBC with strong Crown painting And "Zero Crown-Girdle" Leakage)
please read again :
it is important to have good balance between real difference between diamonds( in optical appearance ) and visual difference in Photos( IS, ASET)
such balance for H&A, IS is discussable until now( there are may Persons thinks what IS, H&A TOO sensitive what reduce their real effectiveness ). ASET is even more sensitive than IS. More sensitive does not mean more helpful, practical ( specially for beginners).
Many additional useless information could easy mislead beginners.
2) Other of most important goal Structure light environments is to show Similarity between similar Diamonds
in other words IS and ASET should help clustering . Clustering is helpful for human when you can received 5-7 clear different Groups.
Did anybody try to do clustering RBC diamonds by ASET? even for IS it is not easy. ASET does this task is too difficult for consumers"