negframes

1 · BUILD SHEET

1 · Source video

Drop a video 1–2 s clip · mp4 / mov / webm

2 · Frames

count

Frames are sampled at the midpoint of n equal slices, so the set loops cleanly.

3 · Sheet layout

paper

orientation

per page

Auto grid (largest frames)

columns rows

margin

gap

4 · Frame border

black border

white inset

Print frame numbers in the gutter Corner fiducial squares (automatic registration)

fiducial size

The black border is itself the registration target — you click its four corners on page 2. The small solid squares are a stronger one: page 2 locates each by its centroid, which averages over every pixel in the square and lands well inside a pixel, where a corner can only ever be as good as its sharpest pixel.

5 · Image

Black & white Invert (image only) Mirror horizontally (emulsion-down)

black point

white point

gamma

contrast

brightness

Drag the handles under the histogram — outer two are the black and white points, the middle one is gamma.

6 · Detail loupe

Hover to magnify

zoom

preview dpi

7 · Export

print dpi

Both files come down together under one name — the PDF to print, and the .json that page 2 needs to place the frames. Keep them side by side.