XnView Software

When using NConvert to process a 14369×5291-pixel monochrome BMP bitmap, the x64 version crashes when rotating by 90° or 270°, while rotation by 180° works normally. Tests have shown that:
All 32-bit versions function properly.
NConvert-6.88-win64 works normally.
NConvert-6.92-win64 crashes, and all newer 64-bit versions also crash.

C:\Users\Administrator\Desktop\test>nconvert.exe -rotate 90 -o output.bmp -overwrite input.bmp
** NCONVERT v7.226 (c) 1991-2025 Pierre-E Gougelet (Jun 17 2025/15:11:26) **
Version for Windows 7/8/10/11 x64 (All rights reserved)
** This is freeware software (for non-commercial use)


C:\Users\Administrator\Desktop\test>nconvert.exe -rotate 180 -o output.bmp -overwrite input.bmp
** NCONVERT v7.226 (c) 1991-2025 Pierre-E Gougelet (Jun 17 2025/15:11:26) **
Version for Windows 7/8/10/11 x64 (All rights reserved)
** This is freeware software (for non-commercial use)

Conversion of input.bmp into output.bmp OK

C:\Users\Administrator\Desktop\test>nconvert.exe -rotate 270 -o output.bmp -overwrite input.bmp
** NCONVERT v7.226 (c) 1991-2025 Pierre-E Gougelet (Jun 17 2025/15:11:26) **
Version for Windows 7/8/10/11 x64 (All rights reserved)
** This is freeware software (for non-commercial use)