The two ways to set a group icon
Detection groups carry a thumbnail image that appears next to the group label in the sidebar and in the colour-swatch column of the Excel export. Two ways to set it:
- Reimage Group — pick a different matched instance from the same drawing as the new thumbnail.
- Custom Image (annotation type) — upload an arbitrary image to drop on the canvas as an annotation.
The two are different features with slightly different purposes — covered below.
Reimage Group
Use this when the auto-detected thumbnail is unclear or unrepresentative (for example, the legend's version looks different from the on-drawing version, or the matched legend symbol got cropped).
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Open the dotted menu on the group's row.
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Choose Reimage Group .
- 3
Pick a different matched instance from the on-drawing markers. ZeroCount uses the bitmap at that position as the new thumbnail.
The group's existing markers stay where they are — only the thumbnail changes. The new thumbnail appears immediately in the sidebar and flows through to future Excel exports.
Reimage Group affects only the thumbnail. It doesn't re-run detection or change which markers are in the group. If you want the matcher to look harder using the new image, run Auto Count Symbol again with the new image as the example.
Custom Image — annotation type
Custom Image is one of the seven annotation types. It lets you drop any image you like onto the drawing — useful for revision notes, logos, callout boxes, or symbols ZeroCount doesn't have a built-in shape for.
This isn't a group thumbnail — it's an annotation marker. See Annotation markers for the full picture.
Uploading
- 1
Click Custom Image in the toolbar's annotation dropdown.
- 2
The Set Custom Image dialog opens.
- 3
Either:
- Click Choose File to pick a local image. Any standard image format works (
image/*accept). When loaded, you'll see "Image loaded" next to the button. - Paste an image URL into the Image URL field — placeholder
https://example.com/image.png.
- Click Choose File to pick a local image. Any standard image format works (
- 4
The preview pane updates with the chosen image.
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Click Apply Image . The button is disabled until a preview is loaded.
- 6
On the drawing, click where the image should sit. Drag the corners to resize.
What custom images are useful for
- Revision boxes — a company-standard revision callout image you drop into the title block area.
- Logos / stamps — for marking drawings up before sharing via image export.
- Custom symbols — when you want to indicate something specific that doesn't map to a built-in shape.
- Photos — a site photo of an installed fitting, dropped onto the as-built drawing.
Like all annotations, Custom Image markers don't appear in the Excel export — they're decoration only.
Choosing the right approach
| What you want | Use |
|---|---|
| A better thumbnail for a Detection group | Reimage Group |
| A picture or logo on the drawing | Custom Image annotation |
| To replace a group's thumbnail with an uploaded image | Not directly supported — Reimage Group only picks from existing matches |