pnmtopalm 命令

常用示例

说明

pnmtopalm converts a PNM image to the Palm Pilot bitmap format. It is part of the Netpbm toolkit. The inverse conversion is performed by palmtopnm.

参数

-depth _n_

Output bits per pixel: 1, 2, 4, 8, or 16. Grayscale inputs are limited to 4 bits maximum.

-maxdepth _n_

Create the minimal-depth output that does not exceed _n_ bits. Setting 16 forces direct-color output.

-colormap

Build a custom colormap and embed it in the output. Less efficient than the default Palm colormap.

-transparent _colorspec_

Mark one color as fully transparent (Palm OS 3.5+).

-density _n_

Palm Bitmap density. Valid values: 72, 108, 144, 216, or 288.

-offset

Set the `nextDepthOffset` field and pad to 4-byte boundaries, allowing multiple image renditions to be concatenated.

-withdummy

Insert a dummy image header after the image so subsequent high-density renditions stay readable by older interpreters. Requires -offset.

-scanline_compression

Use Palm scanline compression (Palm OS 2.0+).

-rle_compression

Use Palm RLE compression (Palm OS 3.5+).

-packbits_compression

Use Palm packbits compression (Palm OS 4.0+). Invalid with 16-bit direct color.

-verbose

Print the format of the output file.