Image Diff

Pavel SerezhinCode & Reviews
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See exactly which pixels changed in an image before you approve it. Before, Diff and After sit side by side, with changed pixels highlighted over a white background, over the new image, or blinking, plus a changed-pixel count. Git LFS images render in place in BB's Diff tab, downloading missing objects on demand. A pinned Image diff tab lists every changed image in the thread, and opening a changed image anywhere shows its diff. LFS images need git-lfs on the host.

Overview

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Review a changed screenshot or image the way you review code: see the exact pixels that moved, not two pictures to squint at.

What you get

  • Before, Diff and After side by side. Changed pixels are painted magenta on the Diff pane. Show them over a white background, over the After image, or let them blink.
  • A number, not a feeling. Every comparison reports how many pixels differ and the percentage, with both images' dimensions. Fit or 100% zoom.
  • Git LFS images inside BB's Diff tab. Where BB would show the two pointer lines of an LFS image, the image diff renders in place. Objects that were never fetched download on demand.
  • An Image diff tab pinned in the right panel whenever the thread has changed images. Pick Uncommitted, Branch or All, then the image.
  • Open a changed image anywhere (a file link in chat, the file picker, bb thread open) and the diff replaces BB's preview. Unchanged images keep BB's preview.

How it works

Both sides are read through BB's bundled Git plugin and compared in your browser with exact pixel equality, so a one-pixel shift shows up. Images of different sizes are compared over the union of their sizes. Nothing leaves your machine, and no account or external service is needed.

Requirements

  • The thread's environment is a Git checkout.
  • PNG, JPEG, GIF, WebP, BMP, ICO, AVIF or SVG, within the Git plugin's per-side size limit (about 2 MiB; 5 MiB for LFS objects).
  • For Git LFS images: git-lfs installed on the host that runs the environment, and access to the LFS remote without a password prompt for objects not fetched yet.

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