Thumbnails for .pse (PSEG3820) have bad quality

[ErichSteinboeck]

The thumbnails shown for 1-bit (black/white) dithered .pse (PSEG3820) images are of a very bad quality -- almost unrecognizable. The image preview shown below the list of thumbnails is fine.

For an example see this screenshot:
[img]http://steinboeck.wikidot.com/local--fi ... review.jpg[/img]

If needed, I've provided a ZIP archive (44 files, 2 MB in total) of a bunch of .pse (PSEG3820) files: [url]http://steinboeck.wikidot.com/local--fi ... EG3820.ZIP[/url]

[xnview]

Do you have enabled option/Thumbnail/High quality?

[ErichSteinboeck]

After setting Tools, Options, Thumbnails, Use high quality, and then refreshing all thumbnails with View, Rebuild thumbnails, the thumbnails look fine!

Thanks!