The crew lead texts a photo of forty trusses with this one's wrong, and the office has to call him back to ask which.

The person who saw the problem wants to be understood the first time. One ring and one arrow does that — no callback, no which one?, no feeling of being second-guessed — so the office acts sooner and the crew feels heard. Arrows drag from start to point, the way a finger points, and the few loud colours read on a sunlit photo, with one soft shadow under the marks instead of a hard outline round each line.

Three things wrong on one photo, three unnumbered arrows, and a reply that says the left one when there are two on the left.

Numbers turn a picture into a list people can act on: 1 is fixed, 2 on Monday. Nobody has to describe the left one, and nobody feels foolish asking. The disc grows and shrinks with the arrow so a marked photo stays easy to read, the head is a clean solid point with no halo round the line, and a pale pen gets a dark numeral so the number always shows.

A note big enough to read covers half the panel you're writing about, and a pen sized for a wide shot vanishes on a tall one.

A mark that hides the thing it's about is worse than no mark. Letting the writer choose the size keeps the photo honest and the note readable, so the person reading trusts both. Thickness multiplies the pen instead of redrawing the line, both settings are remembered on the device, and the standard pen is sized off the photo's shorter side so it looks the same on a tall shot as a wide one.

The arrow is a hair off, and the only way to fix it is to clear everything and start again.

Being able to fix one small mistake without starting over is what makes people willing to try at all. The dashed box is plainly the editor's, never part of the drawing, and a mark you've just drawn stays picked without a box — so you can adjust it while the photo stays clean. The number disc on an arrow picks it too, because it's the biggest target on it.

Marking up twenty QA photos with a mouse is twenty trips to the toolbar for every mark.

Someone reviewing twenty photos wants hands on the keyboard and eyes on the photo. Keys that follow the obvious letters feel natural the first time, so the reviews get done instead of put off. Every finished change is one undo step — a whole drag is one, not one per pixel — and the keys never fire while you're typing a note, so the t in strap truss stays a letter.

The note that mattered got shortened to fix because typing it with cold hands took too long.

Typing with cold hands on a ladder means the note gets shortened to fix. Speaking it means the whole thought survives — and the crew lead feels his judgement was recorded properly, not squeezed. Notes wrap inside nine-tenths of the photo's width and are held inside its edges at every size, so a long sentence never runs off the side.

The crew lead mentions the out-of-plumb post on the phone at six, and by Monday nobody remembers which post.

The best moment to mark a problem is while you're still standing in front of it; memory fades by the drive home. Letting the crew lead circle it before the photos leave means he owns the call, and the office gets it right the first time. The marks travel beside each photo, never burned in, exactly as in the office.

Somebody circles the crack in red on the only copy, and now nobody can see what the crack looked like.

Anyone who has had a photo questioned knows the original is what counts. Keeping the marks as their own layer means the picture you hand an inspector or a customer is exactly what the camera took — that is where trust comes from. Every point is stored as a share of the photo's width and height, so the marks fit any screen and any zoom.

The QA photos the supervisor annotated last month are somewhere among four thousand others, and nothing marks them out.

A marked photo is one somebody cared enough to review — usually the useful ones. Making them findable as a set means that effort pays back: a supervisor's notes become next season's training, and the crew sees their review mattered. The tag uses the filter's own words, so there's nothing to translate.

The crew wrote two chairs short by the north door on a photo, and the person ordering the pour never opened the gallery.

Most people in the office read notes, not galleries. Sending the crew's words to the customer's record means whoever orders the pour, or calls the customer, sees them without hunting — and the crew learns that what they write gets read, so they keep writing. The note follows the photo: change the writing and the note changes, wipe it and the note goes. Lines and arrows alone write no note; there's nothing to read.