Some images don't show up
An experiment is supposed to show a set of images but some of them are invisible on the sketchpad, although they show up in all image management programs (FastStone Image Viewer, Windows Paint, Windows Photos ...). I could not find any particular feature or property that make them different from the pictures that are visible. All the pictures (visible or not) have the same format (.jpeg) and dimensions (600 x 600). Any idea ?