提高魔杖转换质量

问题描述：

我使用魔杖将不同格式的文件（JPEG，PNG，TIFF，PDF）转换为JPEG格式基于Python的ImageMagick绑定。生成的文件质量很差。如果原始文件中有文本，则在结果文件中几乎不可读。

I convert files of different formats (JPEG, PNG, TIFF, PDF) to JPEG using Wand, a ctypes-based ImageMagick binding for Python. The resulting files are very low-quality. If there is text in original file, it becomes almost unreadable in the resulting file.

在Wand之前我使用Imagemagick控制台命令，并使用选项 -density 我可以达到很好的质量。例如： convert -density 200 file.pdf file.jpg 。

Before Wand i used Imagemagick console commands, and with the option -density i could achieve great quality. For example: convert -density 200 file.pdf file.jpg.

什么是最惯用的改进方法Wand中生成的图像文件的图像质量？或者，至少，如何在Wand中设置密度选项？

What is the most idiomatic way to improve image quality of the resulting image file in Wand? Or, at least, how do i set the density option in Wand?

答

这会对您有所帮助。将分辨率选项传递给 Image 的构造函数，例如：

This would help you. Pass resolution option to the constructor of Image e.g.:

with Image(filename='file.pdf', resolution=200) as image:
    image.compression_quality = 99
    image.save(filename='file.jpg')

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