Image Darkmodifier

Obsidian Plugin.

Apply filters, such as darkmode effects (with transparency), to your markdown image links.

This is what it might look like:

No filter:

With @darkmode filter:

How to use this?

1. Add the plugin

2. Just add the filters to the alias part of your image link:

Normal embed:
`![[image.png|image-description]]`

Embed with darkmode: 
`![[image.png|image-description @darkmode]]`

Where darkmode is essentially just a shorthand for this:
`![[image.png|image-description @invert @transparent(threshold="rgb((13, 13, 13))", remove="below") @boost-lightness(amount=1.2)]]`

The filter are applied in order left to right.

Filter Syntax

will look like this for most cases:

@filter-name(boolean-param, int-param=42, float-param=-6.9, string-param="text-value")

For string values, the following characters have to be written in a special way:

• " => ""
• ( => ((
• ) => ))

Backslashes are not allowed. (Due to how the image-alt is parsed by obsidian.)

Link support

All kind's of link notation are supported:

![[image.png | image-description @darkmode]]

![image-description @darkmode | 410](image.png)

<img src="image.png" alt="image-description @darkmode" style="height: 410px">

You can even use image links to remote images:

![image @invert](https://i.pinimg.com/736x/fb/74/eb/fb74ebfb80a42e0ae5a26b86d9f2fe47.jpg)

(Note that this requires a network request to fetch the image data.)

The following filters can be used:

Darkmode

Reccomended for use on images with white backgrounds (e.g. screenshots of diagrams in papers).

name: @darkmode params: none.

Default Behavior

By default, always applies dark mode adjustments: inverts the image, removes the background, and boosts the lightness by 1.2.

Essentially just a shorthand for: @invert @transparent(threshold="rgb((13, 13, 13))", remove="below") @boost-lightness(amount=1.2).

Theme Aware Mode

You can enable Theme Aware Mode in the plugin settings. When enabled, the @darkmode filter automatically adapts to Obsidian's current theme:

In Dark Theme:

• Inverts colors
• Removes dark backgrounds (below threshold)
• Boosts lightness by 1.2x

In Light Theme:

• Keeps original colors (no inversion)
• Removes bright backgrounds (above threshold ~240)
• Reduces lightness by 0.85x to increase contrast

Images will automatically re-render when you switch between light and dark themes.

Invert

Inverts the image.

name: @invert params: none.

Lightness boost

Converts the image pixel representation to hsl, and boosts the lightness.

name: @boost-lightness params:

• amount:
  • float-value: the amount by which to boost the lightness.

Transparency

Make pixels below or above a certain threshold transparent.

name: @transparent params:

• remove:
  • string-value: can be either "above" or "below"
    • if "above": removes pixels above the threshold
    • if "below": removes pixels below the threshold
• threshold: all pixels that have r, g and b channels above or below this threshold will be made transparent.
  • int-value: compare all channels to the same threshold
  • string-value: can be any css-parsable string. e.g. "rgb((69, 42, 3))" or "hsl((35deg, 91.7%, 14.1%))" would have the same effect:

Contributing

Filters

Feel free to open pullrequests or issues. Adding new filters is really straight forward, you can use existing filters for reference.

Mobile support

I don't use Obsidian Mobile myself, so if you want mobile support, feel free to open a PR.

Compatibility

• Plugin will use the current image as you see it in Obsidian
• Theme Detection respects Plugin and any Themes such as that support it

Known issues:

• none so far