使用 imagemagick 的格式字符串和宽度/高度计算新图像大小
在 Web 应用程序中，最好使用 img 标签的宽度和高度属性 - 这允许浏览器更快地渲染页面。
如果我有图像的宽度和高度以及 imagemagick 格式字符串（即“300>”），如何获得该图像将调整到的大小？我希望 imagemagick 有一些钩子/函数可以让我访问这些信息。
我不想调整图像大小或将图像加载到内存中，我只想知道尺寸是多少。
本质上，我想要以下函数：
def get_image_size(width, height, format_string) # ... magic here return [new_width, new_height] end width, height = get_image_size(300, 400, '235x235!') # would return 235 and 235 width, height = get_image_size(300, 400, '700x700>') # would return 300 and 400 width, height = get_image_size(300, 400, '100x100') # would return 75 and 100
In web apps, it's good practice to use the width and height attributes for img tags -- this allows the browser to render the page faster.
If I have the width and height of an image, and a imagemagick format string (i.e. '300>'), how can I get the size that that image would be resized to? I'm hoping that imagemagick has some hooks / functions that would allow me to get access to this information.
I don't want to resize or load the image into memory, I just want to know what the dimensions would be.
Essentially, I want the following function:
def get_image_size(width, height, format_string) # ... magic here return [new_width, new_height] end width, height = get_image_size(300, 400, '235x235!') # would return 235 and 235 width, height = get_image_size(300, 400, '700x700>') # would return 300 and 400 width, height = get_image_size(300, 400, '100x100') # would return 75 and 100
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使用下面的 ImageMagick
convert命令可以得到你想要的。这应该可以轻松转换为您选择的任何 ImageMagick 语言 API。Using the following ImageMagick
convertcommand gives what you want. This should easily translate to whichever ImageMagick language API you choose.