How to Use a Difference View to Review Photo Edits
By ImgHeal · Updated
Use a separate image editor's difference comparison as a change detector without treating every changed pixel as an error.
Start with matching images
Difference comparison works best when the source and edited copy have the same dimensions, alignment, and orientation. Place them on separate layers in an editor that supports the comparison. A one-pixel shift can highlight almost every edge, making the display difficult to interpret. Check ordinary overlay alignment before investigating the difference pattern.
Understand what the display shows
A difference view emphasizes pixel changes; it does not identify which version is historically correct. Tone adjustments, color-profile changes, resizing, and compression can affect broad areas without changing the subject's identity. Review the display alongside the normal images. Do not describe bright regions as damage or invention solely because they differ from the source.
Use it to find unexpected changes
Look for isolated changes outside the area you intended to repair, such as altered lettering, a moved accessory, or a modified face. Return to the normal view to judge each finding. If broad tonal changes overwhelm the comparison, inspect individual correction layers or earlier versions in the separate editor to isolate the relevant operation.
Finish with a human reading of the photo
Compare the complete image at its intended viewing size and ask whether it still represents the source faithfully. If reviewing an ImgHeal result, check familiar features and uncertain regions directly. Save notes about meaningful changes rather than a claim that a dark difference image proves accuracy. A technical comparison supports judgment; it cannot establish missing historical detail.
Before you save this version
- The compared files share alignment and dimensions.
- Difference patterns were checked in normal view.
- Unexpected changes were reviewed against the source.
Continue with a related guide
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