HP LaserJet 打印机上的 PostScript 'image' 命令有哪些限制？答案

【问题标题】：What are limitations of PostScript 'image' command on HP LaserJet printers?HP LaserJet 打印机上的 PostScript 'image' 命令有哪些限制？
【发布时间】：2013-08-25 05:28:51
【问题描述】：

我尝试将手工制作的 PostScript 代码注入到由 pscript5.dll 生成的较大文档中。

我使用取自 http://paulbourke.net/dataformats/postscript/ 的方法（出于某种奇怪原因，我之前使用相同转换矩阵打印 4 位单十六进制字符 (0..f) 的代码 - 停止工作)。

所以，示例代码是：

100 200 translate
26 34 scale
26 34 8 [26 0 0 -34 0 34]
{<
ffffffffffffffffffffffffffffffffffffffffffffffffffff
ff000000000000000000000000000000000000ffffffffffffff
ff00efefefefefefefefefefefefefefefef0000ffffffffffff
ff00efefefefefefefefefefefefefefefef00ce00ffffffffff
ff00efefefefefefefefefefefefefefefef00cece00ffffffff
ff00efefefefefefefefefefefefefefefef00cecece00ffffff
ff00efefefefefefefefefefefefefefefef00cececece00ffff
ff00efefefefefefefefefefefefefefefef00000000000000ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efef000000ef000000ef000000ef0000ef0000efefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efef000000ef00000000ef00000000ef000000efefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efef0000ef00000000000000ef000000ef0000efefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff00efefefefefefefefefefefefefefefefefefefefefef00ff
ff000000000000000000000000000000000000000000000000ff
ffffffffffffffffffffffffffffffffffffffffffffffffffff
>}
image
showpage

接着，在 HP LaserJet 1320 上将源图像 (png) 转换为 1 位（因此将每个像素打印为“00”或“FF”），我偶然发现了一个奇怪的问题：在图像大小达到某个值之间128x128 和 300x450，打印机打印白色矩形而不是预期的图像。总测试文档大小为 2..9 MB。

Ghostscript-9.07 解释器正确显示较大的插入图像，但它似乎与 HP 的嵌入式解释器在实现上有所不同 - 它仍然可以与我之前提到的代码一起正常工作，并且软件解释器的许可是一个事实

除了暴力破解打印机来确定最大值之外，还有哪些可能的方法来解决白方问题。使用“图像”方法的可打印数据大小？

更新：300x300 确认可打印，但随机 500x500 图像不可打印:( 在 280 多个字符处换行 - 没有帮助。

【问题讨论】：

尝试一些已建立的代码，例如 pnmtops。

标签： postscript

【解决方案1】：

对于非常大的图像，您将开始遇到各种实施限制。常见的限制是字符串、数组和字典中的 65535 个元素。如果您的图像数据大于 64k，则需要将其切成 64k 块并分别提供给image（为此，image 采用过程参数而不仅仅是字符串数据源）。

如果您只是嵌入数据以供一次性使用，您可以使用标准的成语进行预读进入缓冲区。

/buf 100 string
26 34 8 [26 0 0 -34 0 34]
{ currentfile buf readhexstring }
image
%hex data starts here

image 可以被认为是一个循环运算符，它将不断调用提供的过程以获取更多数据。该过程甚至不需要返回完整的行，只需要返回一小段字符串。

【讨论】：