The Resize tool in the BQM has one parameter - "length". This is not clear. I assume this means "longest length" - if so, please change the label to that. Reproducible: Always
This option is not suffient for batch - at least a maximum height and a maximum length is needed. This operation is available only for albums, but not for batches. Note: longest length is not clear as well, what happens to rotated images with y>x?
*** This bug has been marked as a duplicate of bug 320362 ***
*** This bug has been marked as a duplicate of bug 241726 ***
With next digiKam 8.4.0, a new G'MIC processor tool for the Batch Queue Manager will be available. The G'MIC scaling filters has the desired options : Image editor : https://i.imgur.com/gzUc5KX.png https://i.imgur.com/6o0CsSN.png BQM : https://i.imgur.com/0bQrJk4.png https://i.imgur.com/xw4VPsa.png Plenty of other G'MIc tools are also available for your workflow, and more (in fact over 600 filters to process photo). The settings from an Image Editor G'MIC-Qt filter can be backported to the BQM using the 'copy' button on the top of the dialog. Gilles Caulier