抱歉，这可能是也可能不是直接的编程问题，但我正在尝试使用 Imagemagick 和 Gimp 调整屏幕截图的大小以包含在 Beamer 演示文稿中，但结果比 由 LaTeX 完成调整大小。
例如，在 Beamer 中，我可能有一个命令来重新缩放图像 \includegraphics[width=.5\textwidth]{fig.png}。使用类似的东西
\begin{frame}
\message{width = \the\textwidth}
\message{height = \the\textheight}
\end{frame}
我已经得到了 \textwidth 和 \textheight 参数（345.69548, 261.92444）。所以我有一个脚本（Python）向 Imagemagick 发送系统调用：
'convert %s -resize %.6f@ resized_%s' % (f,a,f)
其中 a 计算为 \textwidth*\textheight*0.5**2 和 f 是文件名。然后，当我返回到 Beamer 演示文稿并包含调整大小的图形 \includegraphics{resized_fig.png} 时，大小看起来大致正确，但非常模糊。我也尝试在 Gimp 中调整大小（使用 GUI），但也没有运气......帮忙？谢谢...
Sorry, this may or may not be a programming question directly, but I am trying to resize screenshots with Imagemagick and Gimp to include in a Beamer presentation, but it comes out even blurrier than the resizing done by LaTeX.
For instance, in Beamer I might have a command to rescale the image \includegraphics[width=.5\textwidth]{fig.png}. Using something like
\begin{frame}
\message{width = \the\textwidth}
\message{height = \the\textheight}
\end{frame}
I have gotten the \textwidth and \textheight parameters in points (345.69548, 261.92444). So I have a script (in Python) that sends a system call to Imagemagick:
'convert %s -resize %.6f@ resized_%s' % (f,a,f)
where a is calculated as \textwidth*\textheight*0.5**2 and f is the file name. When I then go back into my Beamer presentation and include the resized figure, \includegraphics{resized_fig.png}, the size looks approximately correct but it's super-blurry. I also tried resizing in Gimp (using the GUI) but no luck either... help? Thanks...
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如果您想保留像素清晰度，即不缩放和插值像素，而是将它们表示为小方块，我建议采用以下方法：
使用 sam2p。
照常将转换后的 EPS 或 PDF 包含在文档中。每个像素都只是一个小矩形框，它看起来清晰锐利，并且无需插值即可缩放。
例如，假设我们有一个小的光栅图像，我们想要显示它：
我们可以使用以下命令将其转换为矢量 PDF：
现在我们有一个矢量版本（其中每个像素都是一个矩形） ），我们可以将它包含在任何 LaTeX 文档中并自由缩放。所有像素都会缩放，但不会进行插值。
例如，
它看起来像这样：
缺点：
If you want to preserve pixel sharpness, i.e. do not scale and interpolate pixels, but represent them as small squares, I suggest this approach:
Convert you PNG image to EPS/PDF with sam2p.
Include converted EPS or PDF in your document as usual. Every pixel will be just a small rectangular box, it will look crisp and sharp, and will scale without interpolation.
For example, let's assume we have a small raster image, that we want to show:
We can convert it to vector PDF with this command:
Now as we have a vector version (where every pixel is a rectangular), we can include it in whatever LaTeX document and scale freely. All pixels will scale, but will not be interpolated.
For example,
This will look like this:
Drawbacks: