Match a physical feature, not a corner label
A corner label describes where you intended to place the target. It does not guarantee that the same feature lands at the same coordinates in every photograph. Start in the overview image and click the recognizable feature. Use the horizontal and vertical controls to refine the crop. Compare the shape, edge position and apparent size of that feature in each enlarged view.
The shared crop size uses the same fraction of each image’s shorter edge. This keeps the sampling geometry consistent when image dimensions match, but it cannot undo a changed camera distance or a changed subject scale. If the detail has visibly changed size, retake the set rather than stretching one image until it appears comparable.
Handle orientation explicitly
Browsers usually decode the image using its orientation metadata. A photograph taken with the camera upside down may therefore appear upright. The tool does not automatically add another half-turn. Rotate only the crop that needs it until the same target has a matching orientation. The overview remains in the decoded image orientation so its crop coordinates stay understandable.
Moving the crop or changing its rotation invalidates the alignment confirmation. Inspect the new result and confirm again. The initial report table is a snapshot; the live workbench table and current crop download capture your final adjustments.
Use zoom for inspection, not a higher score
Display zoom enlarges the already extracted crop. It never creates missing detail or changes the measurement grid. The crop caption records how many source pixels were selected and whether the display was reduced to the 768-pixel limit. Measurements always use a common 256 × 256 grid.
Look at edge transitions and fine patterns, not only a number. Halos from sharpening and grain from noise may create higher edge energy while making the underlying photograph less faithful. Check that both crops show the same subject before interpreting any numeric difference.
Save a useful comparison record
- Download the current crop measurements after your final alignment.
- Keep the original photos in the same order as the labeled report.
- Record support, target distance, focus method and export settings separately.
- Repeat the same workflow on another controlled set before drawing a conclusion.