Use a Slack reaction to prepare campaign imagery
A clear approval reaction can start the next image-preparation step, applying a defined brand color overlay through Imgix.
Trigger
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Action
Blend Color Over Image
Tool to blend a solid color over an image using CSS keyword or hex. Use when you need to apply color overlay transformations to an existing image URL.
Why this helps
Creative approvals often sit in chat without anyone remembering the next production step.
- Turn an explicit reaction into a useful production signal.
- Reduce follow-up after an asset is approved.
- Keep the overlay treatment consistent across a campaign.
Setup
Build it in a few focused steps.
- 1Connect Slack and Imgix to Notis once through the portal.
- 2Create a new automation or ask Notis for a reaction-driven image workflow.
- 3Describe which reaction signals approval and the desired Imgix color overlay in one instruction.
- 4Choose the Slack reaction-added trigger, select a run-report channel, and test by reacting to one real image message.
Questions about this workflow
Can I use a specific emoji as the approval signal?
Yes. Name the intended reaction in the plain-language prompt and select the reaction-added trigger.
Will a reaction on any message trigger image processing?
Describe the image context and channel in the prompt so Notis can interpret which reaction applies.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Imgix. A trigger fires from one place; an action lands in another.
Slack triggers
Imgix actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Imgix Auto Optimization
Tool to apply automatic best-effort image optimizations. Use when you need to compress, enhance, format, or remove redeye via Imgix's auto parameter.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Blend Overlay
Tool to overlay an image, text, or color onto a base image using imgix blending parameters. Use after specifying the base image URL and blend parameters to composite layers.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Imgix Blend Align
Tool to align the overlay relative to the base image when blending. Use after constructing a base Imgix URL to specify horizontal and vertical alignment (e.g., 'left,top').
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Blend Color Over Image
Tool to blend a solid color over an image using CSS keyword or hex. Use when you need to apply color overlay transformations to an existing image URL.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Imgix Blend X Position
Tool to position the overlay horizontally on an Imgix-rendered image. Use when you need to offset the blend layer by a specified number of pixels from the left edge.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Draw Image Border
Tool to draw a border around an image. Use when you need to overlay a border without resizing.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Adjust Image Brightness
Tool to adjust image brightness. Use when you need to modify an image's brightness level (−100 to 100) by supplying your source domain and asset path.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
IMGIX_CH
Tool to opt in to Client Hints. Use when you want Imgix URLs to adapt based on browser headers (Width, DPR, Save-Data).
Connect any two apps with Notis in the middle.
Slack and Imgix, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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