Like the simple straight forward approach!

Wish: Implement a gapless mode for images with different aspect ratios.
e.g. Irfanview puts the pictures together side by side without a gap (and only in this way)
Could be done as an additional "rearrangement".

Markus,
Berlin, Germany

Sorry, forgot the way to handle different aspect ratios:
1. if height differs, scale to same height for arrangement "all in single row" -> results in wider or narrower appearance for treated picture
2. if width differs, scale to same width for arrangement "all in single column" -> results in higher or lower appearance for treated picture

Regards,
Markus

It would be good to create proof sheets - grab all images in a folder(s), arrange as thumbnails in a grid and save. If too many photos, create multiple sheets. User can specify how many thumbnails per sheet. Of course, don't keep original resolutions for thumbnails.