[Please describe your issue here. Try to include logs (Help → Logging) and add screenshots if necessary.]
Steps to reproduce issue:
Same B&W photo handled by Gigapixel 7.2.1 woks great to increase two-fold the size of an image. That same image with Photo Ai gets destroyed when enhanced : horizontal blurred lines
Would you mind sending in some more information to get a better understanding of the problem you are having with this particular type of image? Please send the following information:
The original image file.
The processed image.
A screenshot or description of the settings panel so I can see what adjustments were turned on.
You can securely submit your image(s) to my Dropbox using the link below.