GoogleChromeLabs/squoosh

Trim transparent pixels

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#1070 opened on Jun 23, 2021

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 (3 comments) (1 reaction) (0 assignees)TypeScript (20,335 stars) (1,431 forks)batch import
UIcodechelp wanted

Description

Is your feature request related to a problem? Please describe.

When I receive product shots from the design team they often contain lots of whitespace in the form of transparent pixels around the item. I need a way to remove that transparency and change the image dimensions to fit the actual content of the image.

Describe the solution you'd like

Trim transparent pixels around the content of the image. Similar to the Image > Trim... > Transparent Pixels feature in Photoshop.

Does other service/app have this feature?

Yes, see https://www.photopea.com/

Additional context

Contributor guide

Tech stack
typescripthtmlcssnodejs
Domain
frontend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic image processing conceptsCanvas APITypeScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
Examine existing image processing operations in the `src/features` or `src/codecs` directory (e.g., resize, rotate) to understand the pattern. Locate the UI components for image editing, likely in `src/components/`. Implement a trim function that scans pixel data from edges inward to find the bounding box of non transparent pixels, then crops the image accordingly. Add a UI control, such as a button in the editor panel, to trigger the trim. Follow the existing code structure for consistency. Check the issue comments for any additional guidance from maintainers.