Guides
Six pieces on what a tap can and cannot do
Written for the moment before you commit a file, rather than after you have spent six taps finding out.
The bar under the seam has one line of room to justify each decision it makes. These six are the decisions where one line was not enough.
- 01
One spot, or the whole picture
Can you put a fingertip on the problem? The answer decides whether this page is the right one, and it takes half a minute to find out.
- 02
What one tap can fill
The fill copies from the ring around the disc. Sky reassembles perfectly, brickwork does not, and the tool checks which it is looking at before it writes.
- 03
Spots that come from the lens
Sensor dust, smeared glass and rain on a window each have a signature. Learn the three and you check three places instead of hunting a whole frame.
- 04
Portraits are a different job
A disc filled by averaging turns a nostril into a smear. Here is what that looks like, and why the detection step will never be added here.
- 05
Passport and exam photo rules in India — the numbers, dated
The Indian passport, US visa and GATE/JAM photo and signature rules, each with its official page and the date it was read.
- 06
Sensor dust across a folder — same place, every frame
Dust lands in the same place on every frame; shade never does. How to fix the dust once and replay it across a card.
Two of them are about knowing which job you have: one says a global fault wants the Light step rather than taps, one says detailed work on a person wants a tool that finds the person. That is on purpose. A page that only ever argues for itself is not worth reading twice.
