Linux command
pnmrotate 命令
文本
涉及管道、覆盖或删除，执行前请先确认路径和参数。
常用示例
Rotate image
pnmrotate [45] [input.pnm] > [output.pnm]
Rotate with background color
pnmrotate -background [white] [30] [input.pnm] > [output.pnm]
Rotate without anti-aliasing
pnmrotate -noantialias [30] [input.pnm] > [output.pnm]
说明
pnmrotate rotates PNM images by an arbitrary angle specified in degrees (between -90 and 90, measured counter-clockwise). The output image is enlarged as needed to contain the full rotated result, with new areas filled by the background color. Anti-aliasing is applied by default for smooth edges; use -noantialias to disable it for faster processing or when working with binary images. For rotations that are multiples of 90 degrees, use pamflip instead. Part of the Netpbm toolkit.
参数
- -background _color_
- Background fill color. By default, pnmrotate selects what appears to be the background color of the original image.
- -noantialias
- Disable anti-aliasing. Simply moves pixels instead of synthesizing output pixels from multiple input pixels.
FAQ
What is the pnmrotate command used for?
pnmrotate rotates PNM images by an arbitrary angle specified in degrees (between -90 and 90, measured counter-clockwise). The output image is enlarged as needed to contain the full rotated result, with new areas filled by the background color. Anti-aliasing is applied by default for smooth edges; use -noantialias to disable it for faster processing or when working with binary images. For rotations that are multiples of 90 degrees, use pamflip instead. Part of the Netpbm toolkit.
How do I run a basic pnmrotate example?
Run `pnmrotate [45] [input.pnm] > [output.pnm]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -background _color_ do in pnmrotate?
Background fill color. By default, pnmrotate selects what appears to be the background color of the original image.