Optimize an image after Slack approval
Mark the message with your agreed reaction and let Notis send its public image URL for optimization.
Trigger
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Action
Optimize Image by URL
Tool to optimize an image from a public url. use when you need to compress, resize, or convert an externally hosted image. returns result immediately if 'wait' is true.
Why this helps
Approved assets can sit idle because the handoff from review to file preparation is easy to miss.
- Turn an existing review signal into a follow-up action.
- Avoid manually revisiting approved image messages.
- Keep the optimization step tied to the approval context.
Setup
Build it in a few focused steps.
- 1Connect Slack and Kraken.io to Notis once.
- 2Create an automation in the portal or ask Notis conversationally.
- 3In one instruction, tell Notis which approval reaction and image URL context should trigger Kraken.io optimization.
- 4Select the Slack message reaction added trigger and choose a channel for run reports.
- 5Test by adding the agreed reaction to a message with a public image URL.
Questions about this workflow
Does adding any reaction start the workflow?
Specify the reaction and relevant image context in the plain-language prompt.
Can this optimize a private Slack attachment?
Kraken.io needs a URL it can access; a private Slack attachment may not meet that requirement.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Kraken io. A trigger fires from one place; an action lands in another.
Slack triggers
Kraken io actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Check Kraken.io User Status
Tool to retrieve current kraken.io account status and quota usage. use when you need to verify plan limits and remaining quota before processing images.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Optimize Image by URL
Tool to optimize an image from a public url. use when you need to compress, resize, or convert an externally hosted image. returns result immediately if 'wait' is true.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Preserve Image Metadata
Tool to preserve exif and other metadata during kraken.io image optimization. use when you need to maintain metadata while compressing images.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Sandbox Image Upload
Tool to upload and optimize images in sandbox mode. use when you want to test the kraken.io api without consuming credits.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Connect any two apps with Notis in the middle.
Slack and Kraken io, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
Save your first hour today.
7-day trial of any paid plan, with 20$ of usage included.
No card. Works with personal or business Kraken io.