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Asked: 2025-03-07 20:28:02 +0800 CST

How can I fix QGIS logo appearing instead of thumbnail of a photo?

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enter image description here

Any idea why some .jpg get QGIS as thumbnail? And how to fix it?

I am using PCManFM-Qt 1.4.1 and had similar problem already on Lubuntu 20.04. It is still happening on a brand new Lubuntu 24.04 install.

I set default opening program already and it works fine file --mime-type IMG_20250302_093435.jpg shows image/jpeg in ~/.config/mimeapps.list qgis is only under application/geo+json=org.qgis.qgis.desktop; and application/json=org.qgis.qgis.desktop; I deleted /home/mateusz/.cache/thumbnails just in case xdg-mime query default image/jpeg shows org.gnome.eog.desktop exiftool IMG_20250302_093435.jpg has entry Thumbnail Image : (Binary data 49792 bytes, use -b option to extract) - no idea is it indicating anything bad

exiftool -b -ThumbnailImage IMG_20250302_093435.jpg > extracted_thumbnail.jpg extracts 100% fine image

I have not disabled thumbnails.

enter image description here

lubuntu

1 Answers

  1. Best Answer

    What you are seeing is not a thumbnail, but an icon. This is what you see when thumbnails are not shown.

    If you would like to see a thumbnail of files, you will need to ensure that PCManFM-Qt is configured to show them:

    1. Go to Edit > Preferences
    2. Click on Thumbnail in the sidebar
    3. Make sure "Show thumbnails of files" is checked
    4. Make sure that the limits shown don't prohibit your image from being thumbnailed (the default behavior is that thumbnails will not be created for images that are larger than 4MB)
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