0.80: Pan Tool show corruption

by helmut (Posted Mon Feb 13, 2017 7:53 pm)
Thank you for your problem report and sorry for the very late reply.

I could reproduce your problem using the following steps:
1. Open a JPG photo
2. Select Image » Adjust » Enhance colors
3. Set "Saturation" to "-100" and apply with "OK" button.
(Your image is a greyscale image, now).
4. Zoom into the image. XnView displays the Pan tool in the bottom-right corner. The image in the Pan tool looks fine. (correct).
5. Select "Image » Change color depth..."
6. Choose "Color = 8 and Dithering = Floyd Steinberg.
7. Confirm with "OK".
(Your image is a dithered image with 8 colours, now)
Actual result: The image in the Pan tool looks very messy and full of pixels.
Expected result: The image in the Pan tool should show a miniature of the actual picture.

Until now (XnView MP 0.84), XnView MP doesn't use high quality zooming for the pan tool. For this reason dithered black&white images look very ugly in the pan tool.

Suggestion: High quality zooming should be applied for Pan tool.

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