diff-pdf-action

Action for visually comparing two PDF files using diff-pdf.

By default, This action is successful if there are no differences and failure if the two PDFs differ. If given the --output-diff option, it produces a PDF file with visually highlighted differences.

Inputs

file1

Input PDF file1 path. (required)

file2

Input PDF file2 path. (required)

options

Specify diff-pdf command options if you need. Follows are quoted from diff-pdf --help:

-v, --verbose                   be verbose
-s, --skip-identical            only output pages with differences
-m, --mark-differences          additionally mark differences on left side
-g, --grayscale                 only differences will be in color, unchanged parts will show as gray
--output-diff=<str>             output differences to given PDF file
--channel-tolerance=<num>       consider channel values to be equal if within specified tolerance
--per-page-pixel-tolerance=<num>    total number of pixels allowed to be different per page before specifying the page is different
--dpi=<num>                     rasterization resolution (default: 300 dpi)

Note: --view option is not available.

suppress-diff-error

If set true, Exit code to 0 even there is a difference. (Expected to be used with --output-diff option)

Outputs

None.

Note: Output following log when running this action. However, don't worry there is no problem.

Unable to init server: Could not connect: Connection refused
01:20:19: Error: Unable to initialize GTK+, is DISPLAY set properly?

Examples

Using action

Expect to match (e.g. visual regression tests)

jobs:
  diff:
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:
      - uses: actions/checkout@v3
      - uses: nowsprinting/diff-pdf-action@v1
        with:
          file1: expected.pdf
          file2: actual.pdf
          options: --verbose
        # If PDFs do not match, this step will fail.

Generate diff PDF (e.g. before and after on pull-request)

jobs:
  diff:
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:
      - uses: actions/checkout@v3
      - uses: nowsprinting/diff-pdf-action@v1
        with:
          file1: base.pdf
          file2: head.pdf
          options: --skip-identical --output-diff=diff.pdf --dpi=100
          suppress-diff-error: true

Using container

jobs:
  diff:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    container:
      image: ghcr.io/nowsprinting/diff-pdf:latest

    steps:
      - uses: actions/checkout@v3
      - run: diff-pdf --verbose expected.pdf actual.pdf

License

MIT License

How to contribute

Open an issue or create a pull request.

Create pull request

Be grateful if you could label the PR as enhancement, bug, chore and documentation. See PR Labeler settings for automatically labeling from the branch name.

Release workflow

Make change draft release to Publish release.