Thank You for remembering our concern - Sometimes those ID's of a cast list (page) it's like a puzzle / mosaic.
After You found one You will be able to eliminate that name as a probably name for another "suspect" unknown actor.
And thus sometimes one ID is the basic for the next ID - since often some unknown actors appear together in several movies because for example they are used to work with that company / producer / director or action director.... who frequently uses them.... You see?
As for decompressing pictures I am not quite sure what You mean - perhaps You can give me an example.
I my memories the portraits should at least be not square or not broader than its height (am i wrong?) I call the shape the letter-stamp shape....
Maybe I am wrong - actually to be frank I do not always study all that tons of rules again and again and in real life I do not study the "first-aid"-lessons
each year to not forget how it works. We maybe should have a glossary for that like a FAQ which contains the major rules (or offenses against them)
as for Cantonese Names: (One of my favorite topics ever!!)
I learned some Mandarin in my spare-time to communicate with my wife - to be frank I won't be married with her without my speaking skill.
But some Cantonese names really make me suffer. Even many Shaw Brothers Actors which were never credited in Cantonese still have names never ever visible in any Credits of the movies they were billed for - (some newbies therefore will hardly find them in pinyin-search)
But i am afraid some people are such used to that "wrong" (unfamiliar) names they will surely oppose and feel offended I assume...
Some example:
Liu Chia-Liang's (Mandarin) brother is listed as Lau Kar-Wing (1) (Cantonese) - see action directors for: Boxer from Shantung (1972)
Ching Li's (Mandarin) Father is listed as Cheng Miu (I never get used to that - In mind he is always Ching Miao)
Lau Gung has made 41 of his 42 movies for Shaw Brothers always listed as Liu Gang -
David Chiang (mandarin) brother Paul Chun Pui (cantonese) - Say: Let me browse some Shaws and we sure find many examples