Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

Image comparing tests for ImageExport

Open
#317 1 comment 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
fsharp

Research direction

Start by locating Plotly.NET.Export and the existing image export tests. Read how exported base64 images are decoded, then determine how a reference image can be compared pixel by pixel with an average deviation threshold. Done means image export tests accept equivalent encodings while detecting meaningful visual differences.

Written by the indexing model from the issue text.

Description

Area: ImageExport help wanted

There's Plotly.NET.Export which exports images, for example, into base64. However testing it on exact matches doesn't work well, after all, there are multiple ways the same image can be encoded with jpg or png.

So the idea here is to convert it to an image and compare pixel by pixel against a model one. If the deviation on average isn't big, then the test is considered to pass.

Dominant language
F#
Stars
860
Forks
99
Avg merge
22m
Merged PRs (30d)
1

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

More from plotly/Plotly.NET

All issues in plotly/Plotly.NET

Similar issues

More Data Visualization issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.