Linux command
pnmpad 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
Add padding to image
pnmpad -left [10] -right [10] [input.pnm] > [output.pnm]
Add uniform padding
pnmpad -width [100] -height [100] [input.pnm] > [output.pnm]
Pad with specific color
pnmpad -color [white] -left [5] [input.pnm] > [output.pnm]
说明
pnmpad adds padding (blank space) around PNM images, extending the canvas size without scaling the original content. Padding can be added independently to each side using -left, -right, -top, and -bottom. Alternatively, -width and -height specify the desired output dimensions, with -halign and -valign controlling alignment within the padded canvas (default is centered). The -color option sets the padding color (default is black). The -mwidth and -mheight options pad to a multiple of a given pixel count. This is the inverse of pnmcrop. Part of the Netpbm toolkit.
参数
- -left _N_
- Pixels to add on left.
- -right _N_
- Pixels to add on right.
- -top _N_
- Pixels to add on top.
- -bottom _N_
- Pixels to add on bottom.
- -width _N_
- Target width (centered).
- -height _N_
- Target height (centered).
- -color _COLOR_
- Padding color (default: black).
- -white
- Pad with white (shortcut).
- -halign _RATIO_
- Horizontal alignment ratio (0.0=left, 0.5=center, 1.0=right).
- -valign _RATIO_
- Vertical alignment ratio (0.0=bottom, 0.5=center, 1.0=top).
- -mwidth _N_
- Pad width to a multiple of N pixels.
- -mheight _N_
- Pad height to a multiple of N pixels.
- -extend-edge
- Pad by duplicating adjacent edge pixels.
- -detect-background
- Detect and use image background color for padding.
- -reportonly
- Print padding description instead of producing output.
FAQ
What is the pnmpad command used for?
pnmpad adds padding (blank space) around PNM images, extending the canvas size without scaling the original content. Padding can be added independently to each side using -left, -right, -top, and -bottom. Alternatively, -width and -height specify the desired output dimensions, with -halign and -valign controlling alignment within the padded canvas (default is centered). The -color option sets the padding color (default is black). The -mwidth and -mheight options pad to a multiple of a given pixel count. This is the inverse of pnmcrop. Part of the Netpbm toolkit.
How do I run a basic pnmpad example?
Run `pnmpad -left [10] -right [10] [input.pnm] > [output.pnm]` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -left _N_ do in pnmpad?
Pixels to add on left.