Prepare social images in the right frame
A requested frame can become part of the image workflow as soon as the social asset is shared in Slack.
Trigger
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Action
Force Aspect Ratio
Tool to force a target aspect ratio on an Imgix image. Use when a specific W:H frame is needed after choosing fit=crop or fit=fill. Example: 'ar=16:9&fit=crop&w=800' yields a 16:9, 800px-wide URL.
Why this helps
Making one image fit several social placements creates repetitive crop decisions and exports.
- Create consistent frames for repeated placements.
- Reduce manual trial and error for each social image.
- Make the publishing handoff clearer.
Setup
Build it in a few focused steps.
- 1Connect Slack and Imgix to Notis once in the portal.
- 2Create a new automation or ask Notis to create one in plain language.
- 3Describe the social image context and requested aspect ratio in one instruction.
- 4Select the Slack channel-message trigger, choose a run-report destination, and test with one real social asset.
Questions about this workflow
Can the aspect ratio vary by placement?
Describe the placement and desired ratio in the prompt so Notis can interpret the request.
Can the crop be part of the same outcome?
Include the desired fit behavior alongside the aspect ratio in the instruction.
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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