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Comparing image sliders
About 15 minutes · no sign-up · anonymous
Each screen shows one photo and one instruction, edited by two systems, with the original in the middle. A single slider moves both sides at once: far left is the untouched photo, far right the full edit. Drag it, then answer two questions.
A good slider
- Makes the edit — by the far right, convincingly.
- Keeps the photo — everything the instruction didn't mention stays the same.
- Looks clean — no warping, smearing or artefacts.
- Only moves forwards — never partly undoes itself.
- Moves evenly — no dead zones, no jumps.
The two questions
1. Which is better overall? All five together, weighted however seems right to you.
2. Which spreads the change more evenly? Just the last property, ignoring the rest.
What "evenly" means
Each step of the slider should change the picture about as much as the step before. A dead zone is a stretch where dragging does almost nothing; a jump is one small movement that changes everything. They usually arrive together.
The two questions usually agree, but not always — a side can reach the better result while moving far less evenly. Answer each on its own terms.
Practical
The five thumbnails under each side are snapshots across the slider's range, which make dead zones and jumps easy to spot. Sides are randomised and never named. You have 15 minutes; it stops on its own, and you always finish the pair you're on.
Time's up — thank you
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