Gantt 3.0.12.0 Visual blurry on Report Server

[PBI2025]

Hi,

I am using Gantt 3.0.12.0 and it is working fine on Desktop. However when viewing on Report Server the visual is quite blurry. This blur disappears when in Focus Mode, however I would like it to be visually clear outside of this.

Thanks.

[Poojara_D12 · Accepted solution]

Hi @PBI2025 

The issue you’re seeing with Gantt 3.0.12.0 appearing blurry in Power BI Report Server (PBIRS) but displaying clearly in Power BI Desktop or in Focus Mode is a known rendering limitation specific to custom visuals in PBIRS. When a custom visual is displayed in the standard (non-focus) mode, Report Server often scales or rasterizes the visual as an image to optimize performance and compatibility, particularly when using older or uncertified visuals. This scaling process reduces the resolution and causes the blurry appearance you notice. However, when you switch to Focus Mode, PBIRS renders the visual in full vector quality, which eliminates the blur. Unfortunately, there’s no setting within Report Server to change this behavior globally.

To improve clarity, you can try a few workarounds: first, ensure that you’re using the latest certified version of the Gantt visual compatible with Report Server (uncertified visuals tend to render at lower quality). You can also reduce browser zoom or adjust visual dimensions in your report layout to minimize scaling distortion. Some users have also found that using Edge or Chrome with hardware acceleration enabled improves rendering sharpness slightly. However, as of now, PBIRS does not fully support high-DPI vector rendering for custom visuals outside Focus Mode — this limitation is tied to the Report Server’s static rendering pipeline.

[v-csrikanth]

Hi @PBI2025 

Just a follow up to check whether your issue has been addressed or if you are still facing any issues let's post into the community we are happy to assist you.

Thanks,
Cheri Srikanth
CST team.

[v-csrikanth]

Hi @PBI2025 

Thanks for reaching out to Fabric Community.

As mentioned by @Nasif_Azam @tayloramy @Poojara_D12, it was a known limitation for specific to custom visuals in PBIRS. If your query has been addressed and resolved, please feel free to reach to community for further issues.

Thanks,

Cheri Srikanth
CST team.

[Nasif_Azam · Accepted solution]

Hey @PBI2025 ,

This behavior is a known limitation related to how Power BI Report Server renders certain custom visuals. When viewed in the regular report canvas, visuals like Gantt 3.0.12.0 can appear slightly blurry because Report Server uses image-based rendering rather than full vector rendering. That’s why it looks sharp in Focus Mode or on Power BI Desktop (which use a different rendering engine).

Recommended Steps to Improve Clarity:

1) Set Browser Zoom to 100%: Blurriness often occurs when zoom is less than or greater than 100%.

2) Update Browser and Report Server: Upgrade to the latest Chromium-based browser (Chrome or Edge) and ensure your Power BI Report Server is up to date. Microsoft confirmed fixes in newer browser builds.

3) Adjust Report View Settings: Use Fit to Page or Actual Size in Report Server to avoid scaling issues.

4) Update the Gantt Visual: Make sure you’re using the latest version of the Gantt visual from AppSource. Older versions have rendering bugs.

5) Check DPI and Display Scaling: High-DPI monitors and custom scaling can cause blurriness. Set display scaling to 100% for best results. 

For Detailed Information:

• Custom Visuals become blurry when zooming the canvas
• Gantt 3.0.12 is blur
• Why is the Gantt Chart visual blurry in published version?
• Power BI - Visuals Gantt Issues

Check The Following Forums Also:

• Custom Visuals become blurry when zooming the canvas
• Why is the add on visual Gantt Chart by MAQ Software displaying as blurry in the published version
• my Gantt by Microsoft Corporation ver. 3.0.12.0

Best Regards,
Nasif Azam

[tayloramy]

Hi @PBI2025, 

What version of RS are you using? 

This “blurry unless in Focus mode” behavior is (unfortunately) pretty common for custom visuals on Power BI Report Server. It usually happens when the canvas is being scaled (browser zoom, “Fit to page/width”, Windows display scaling, or a visual sized to fractional pixels)

Example thread.

Try making the canvas size larger or using a different browser and see if the issue remains

If you found this helpful, consider giving some Kudos. If I answered your question or solved your problem, mark this post as the solution.

[Poojara_D12 · Accepted solution]

Hi @PBI2025 

The issue you’re seeing with Gantt 3.0.12.0 appearing blurry in Power BI Report Server (PBIRS) but displaying clearly in Power BI Desktop or in Focus Mode is a known rendering limitation specific to custom visuals in PBIRS. When a custom visual is displayed in the standard (non-focus) mode, Report Server often scales or rasterizes the visual as an image to optimize performance and compatibility, particularly when using older or uncertified visuals. This scaling process reduces the resolution and causes the blurry appearance you notice. However, when you switch to Focus Mode, PBIRS renders the visual in full vector quality, which eliminates the blur. Unfortunately, there’s no setting within Report Server to change this behavior globally.

To improve clarity, you can try a few workarounds: first, ensure that you’re using the latest certified version of the Gantt visual compatible with Report Server (uncertified visuals tend to render at lower quality). You can also reduce browser zoom or adjust visual dimensions in your report layout to minimize scaling distortion. Some users have also found that using Edge or Chrome with hardware acceleration enabled improves rendering sharpness slightly. However, as of now, PBIRS does not fully support high-DPI vector rendering for custom visuals outside Focus Mode — this limitation is tied to the Report Server’s static rendering pipeline.