XnView Software

XnView: MP 0.98.1 - 64-bit
OS: Windows 10 - 64-bit

Effect: A black bar appears

To reproduce:

1. Use any white-edged image, converted into a 256-order Grayscale image.
2. You can use Batch Convert, or exports. And can be converted to TIF or PNG.

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     图像 55.png (11.63 KiB) Viewed 721 times

3. Open conversion results and zoom to less than 100%。
4. A black bar appears at the bottom.

   

Also have this problem with grayscale images generated by IrfanView.
So this should be a display problem, not a data problem.

The grayscale images with this display problem

right, i can reproduce with bilinear scaling