The sweep fetches the whole original before it can learn anything
about it, and the one file in the reference library the decoder
refuses on sight is a 521 MB stitched panorama — so every pass on the
tablet spent half a gigabyte of Wi-Fi to find that out again. The
catalog already knows the byte count, and that is enough to decide
before the fetch: originals over 256 MB are marked examined with
nothing found and a zero edge, counted as failed, and named in the
log. Below the line is every camera RAW the library holds; above it,
four files, all panoramas.
A budget and not a verdict on panoramas. The right treatment for one
is a tiled pass — read it in strips, detect in each, stitch the boxes
back — and the zero edge is what that pass would select on. Until it
exists, this is what keeps a background sweep on a phone from paying
for the decision the decoder cannot make.
dtourolle
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