Python Wand将tiff更改为min-is-white [英] Python Wand change tiff to min-is-white

问题描述

我需要将文件转换为tiff，其中光度计设置为min-is-white（白色为零）以符合所需标准。我正在使用Wand与Photomagick进行交互，但每次我保存一个双层tiff文件，它会创建一个min-is-black。

I need to convert files to tiff where photometric is set "min-is-white" (white is zero) to comply with the required standards. I'm using Wand to interact with Photomagick but every I save a bilevel tiff file, it creates a min-is-black.

如何让Wand保存它白色是零？它甚至可能吗？

How can I get Wand to saves it where White is Zero? Is it even possible?

推荐答案

马克的评论是正确的。您需要为ImageMagick设置 -define 属性。

Mark's comments are correct. You need to set the -define property for ImageMagick.

对于 wand ，你必须扩展核心 wand.api.library 连接MagickWand的C-API MagickSetOption 方法。

For wand, you'll have to extent the core wand.api.library to connect MagickWand's C-API MagickSetOption method.

from ctypes import c_void_p, c_char_p
from wand.api import library
from wand.image import Image

# Tell python about the MagickSetOption method
library.MagickSetOption.argtypes = [c_void_p,  # MagickWand * wand
                                    c_char_p,  # const char * option
                                    c_char_p]  # const char * value

# Read source image
with Image(filename="/path/to/source.tiff") as image:
    # -define quantum:polarity=min-is-white
    library.MagickSetOption(image.wand,          # MagickWand
                            "quantum:polarity",  # option
                            "min-is-white")      # value
    # Write min-is-white image
    image.save(filename="/path/to/min-is-white.tiff")

您可以使用<$ c $验证生成的图像c>识别实用程序。

identify -verbose /path/to/min-is-white.tiff | grep photometric
#=> tiff:photometric: min-is-white

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