YanoSecAn image task can offer several kinds of evidence: visible content, a text description and metadata. Keep their origins separate. A landmark is a feature used to compare locations; a match is a lead until relevant independent evidence supports it.
The supplied PNG is an 8×8 solid rectangle. It does not depict the sign used by this exercise. The sentence on image-card.txt describes an imagined sign reading LAMP ROOM; that sentence is the visual model for this task. The GPS square is another typed card claim, not a tag inside the PNG. No real coordinates or person are involved.
Before you begin
- Recommended first
- Hex, Base64, and XOR in code, Encoding, hashing, and encryption, Notes: scope, command, result, time, Search operators on a challenge
- Estimated time
- 15 min reading, 15 min activity. Setup and optional practice may take longer.
- Where you work
- Use only the supplied fictional corpus: notices, source cards, saved page, image description/map and DNS/registration table. Keep work in private notes. No real-person research, live search, image upload, map lookup, contact or account is required or authorized by this exercise.
- Without a lab
- All evidence needed for the activity appears on this page. Copy it into notes if downloads are unavailable. Read the labeled model and predict each result; a paper trace practises the reasoning while tool operation waits for a lab. Reading needs no JavaScript. Answer checking needs JavaScript and a secure context; saving progress also needs usable browser storage.
After this lesson you can:
- Read the sign sentence from the text card.
- Match that sentence to square L4 on the fictional map.
- Leave the typed GPS square M9 as an unconfirmed lead.
01Example
Fresh fictional comparison illustrating ambiguous clues. It does not change the provided map.
Text description: a plain blue wall
Map candidates: two squares both show a plain blue wall
Conclusion: the clue does not select a unique square.
Additional evidence is needed; a matching description is not a verified location.02A typed location is a lead
GPS is a satellite-based positioning system; a GPS metadata field can store a location claim. Here M9 is only a fictional map-square label. Its editability means it must not automatically override other evidence.
Reverse image search would send an image or its derived data to a service to find related images. That adds disclosure and an external source. This lesson requires no upload. Compare the supplied description and map on paper, and record their disagreement rather than forcing a confirmed location.
Compare a described visual clue and an editable location claim without treating either as confirmed geography.Model. A teaching model drawn by hand. It shows the idea, not real tool output.
Read the full explanation below.
Text clue
Text description: a plain blue wallSupplied map candidates
Map candidates: two squares both show a plain blue wallBoth squares fit the clue
The supplied candidate description names the same plain blue wall in both squares.
This is a typed clue, not a verified location.
Original fictional teaching evidence
The supplied candidate description names the same plain blue wall in both squares. This is a typed clue, not a verified location.
Follow the explanation
- The supplied candidate description names the same plain blue wall in both squares. This is a typed clue, not a verified location.
- Two matching squares remain. Additional evidence is needed.
Read every state and value
1. The supplied candidate description names the same plain blue wall in both squares. This is a typed clue, not a verified location.
- Evidence selected
- Text clue · Supplied map candidates
- Current claim
- both
- Source origins
- Original fictional teaching evidence
2. Two matching squares remain. Additional evidence is needed.
- Evidence selected
- Text clue · Supplied map candidates
- Current claim
- unique
- Source origins
- Original fictional teaching evidence
03Match the sign to a square
Use the three printed text cards. The rectangle file cannot supply the imagined sign or the typed location.
Label: fictional drawing, described in text.
The PNG fictional-scene.png is an 8 by 8 solid rectangle written by the asset serializer.
No camera, no face, no landmark photograph, and no OCR run.
Imagined scene, supplied only as text: a sign reads LAMP ROOM.
The solid rectangle PNG does not depict that sign.
That sentence is the image evidence. The pixels were not read back.
Label: authored tag card for the fictional drawing. Not exiftool output.
The PNG does not contain this GPS line. The line was typed.
Comment: absent
GPS square: M9
Editable: yes
Map comparison: candidate-map.txt
A GPS square on this card is a claim. The sign sentence is a different claim.
Label: fictional club map. Not a geographic survey. No real coordinates.
Square L4: a sign drawn as LAMP ROOM.
Square M2: a corridor, no sign.
Square M9: blank on this map.
The sign sentence supports L4.
The typed GPS line says M9. The map does not draw a sign there.
- Copy LAMP ROOM from image-card.txt and identify its source as the written description.
- Compare map squares: L4 has the matching sign, M2 a corridor and M9 no sign. Record L4 as the description-supported candidate.
- Read the separate GPS-square claim M9 and write the disagreement. Leave the actual location unconfirmed; neither the solid pixels nor a real-world source resolves it.
- Stop with source, candidate and limit. Do not upload the image or look up a real place.
04Optional challenge
For about ten optional minutes, draft an evidence table with columns claim, source, editable/constructed and limit. Include the sign description, the M9 tag card and the solid rectangle. The rubric is accurate separation of those three origins.
05Fresh cases for the checks
Use these fictional cases for the checks below. They have different inputs from the worked examples. Read them here or make notes; no installation or external service is needed.
Image-description card A: fresh fictional evidenceOwned fixture. An original file made for this course. Follow the activity's instructions in your own lab.
Supplied imagined scene text: a sign reads CEDAR HALL.
The accompanying solid-colour rectangle does not depict this sign. No OCR, camera or image search is performed.
The sign words come from this typed description only.
Map card B: independent fictional map comparisonOwned fixture. An original file made for this course. Follow the activity's instructions in your own lab.
K2: a plain wall, no sign.
K6: a sign reading CEDAR HALL.
K9: a blank square.
Separate typed editable tag card: GPS square K9. It is not an embedded tag in the rectangle file.
There are no real coordinates or live map sources.
Corroboration card COwned fixture. An original file made for this course. Follow the activity's instructions in your own lab.
The sign description and typed location disagree. The packet supplies no independent observation of the place or authenticated record connecting the drawing to a square.
06Explain the evidence and its limit
Optional self-check: make a table of claim, source, editable/constructed status and limit for description, map, tag and rectangle.
Review it: distinguish imagined sign text from pixels, preserve the location conflict, avoid real-person investigation and leave missing corroboration unresolved.
07Common mistakes
If you expect to see a sign in the PNG, return to the source distinction: the sign is a textual model; the file is a solid rectangle.
If M9 is accepted as confirmed location, identify corroboration rather than relying on a field’s label.
If an external upload seems necessary, stop; the complete reasoning evidence is already supplied in text.
References
- ExifTool by Phil Harvey
Official metadata-tool background; the activity uses separate authored claims and makes no image upload.