When adding a watermark to a jpeg image using Batch Queue Manager and saving the file results in a very much reduced file size. A 6.7MB original jpeg image processed in this way ends up being saved as a 1.2MB image even with a jpeg compression value of 100%.The process using BQM should result in an image of about 6.2MB (which is what imagemagick and GIMP achieve). 

Reproducible: Always

Steps to Reproduce:
1. Select a jpeg image
2.Enter BQM and select watermark
3. Select to save as a new file name
4. Run queue

Actual Results:  
Original image was 6.7mb Resulting image saved is 1.2MB

Expected Results:  
 If the same watermark operation is done manually in edit within digikam the resulting file size is 6.2MB. 

This is 100% repeatable and effectively means the BQM is unusable for watermarking images and maintaining quality of image.